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Install",[590,591,592,623,641,659],"code-group",{},[593,594,600],"pre",{"className":595,"code":596,"filename":597,"language":598,"meta":599,"style":599},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog hono @hono\u002Fnode-server\n","pnpm","bash","",[515,601,602],{"__ignoreMap":599},[603,604,607,610,614,617,620],"span",{"class":605,"line":606},"line",1,[603,608,597],{"class":609},"sBMFI",[603,611,613],{"class":612},"sfazB"," add",[603,615,616],{"class":612}," evlog",[603,618,619],{"class":612}," hono",[603,621,622],{"class":612}," @hono\u002Fnode-server\n",[593,624,627],{"className":595,"code":625,"filename":626,"language":598,"meta":599,"style":599},"bun add evlog hono @hono\u002Fnode-server\n","bun",[515,628,629],{"__ignoreMap":599},[603,630,631,633,635,637,639],{"class":605,"line":606},[603,632,626],{"class":609},[603,634,613],{"class":612},[603,636,616],{"class":612},[603,638,619],{"class":612},[603,640,622],{"class":612},[593,642,645],{"className":595,"code":643,"filename":644,"language":598,"meta":599,"style":599},"yarn add evlog hono @hono\u002Fnode-server\n","yarn",[515,646,647],{"__ignoreMap":599},[603,648,649,651,653,655,657],{"class":605,"line":606},[603,650,644],{"class":609},[603,652,613],{"class":612},[603,654,616],{"class":612},[603,656,619],{"class":612},[603,658,622],{"class":612},[593,660,663],{"className":595,"code":661,"filename":662,"language":598,"meta":599,"style":599},"npm install evlog hono @hono\u002Fnode-server\n","npm",[515,664,665],{"__ignoreMap":599},[603,666,667,669,672,674,676],{"class":605,"line":606},[603,668,662],{"class":609},[603,670,671],{"class":612}," install",[603,673,616],{"class":612},[603,675,619],{"class":612},[603,677,622],{"class":612},[585,679,681],{"id":680},"_2-initialize-and-register-the-middleware","2. Initialize and register the middleware",[593,683,688],{"className":684,"code":685,"filename":686,"language":687,"meta":599,"style":599},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { serve } from '@hono\u002Fnode-server'\nimport { Hono } from 'hono'\nimport { initLogger } from 'evlog'\nimport { evlog, type EvlogVariables } from 'evlog\u002Fhono'\n\ninitLogger({\n  env: { service: 'my-api' },\n})\n\nconst app = new Hono\u003CEvlogVariables>()\n\napp.use(evlog())\n\napp.get('\u002Fhealth', (c) => {\n  c.get('log').set({ route: 'health' })\n  return c.json({ ok: true })\n})\n\nserve({ fetch: app.fetch, port: 3000 })\n","src\u002Findex.ts","typescript",[515,689,690,719,740,761,789,796,809,837,846,851,881,886,905,910,947,994,1025,1032,1037],{"__ignoreMap":599},[603,691,692,696,700,704,707,710,713,716],{"class":605,"line":606},[603,693,695],{"class":694},"s7zQu","import",[603,697,699],{"class":698},"sMK4o"," 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One request = one wide event:",[593,1114,1116],{"className":684,"code":1115,"filename":686,"language":687,"meta":599,"style":599},"app.get('\u002Fusers\u002F:id', async (c) => {\n  const log = c.get('log')\n  const userId = c.req.param('id')\n\n  log.set({ user: { id: userId } })\n\n  const user = await db.findUser(userId)\n  log.set({ user: { name: user.name, plan: user.plan } })\n\n  const orders = await db.findOrders(userId)\n  log.set({ orders: { count: orders.length, totalRevenue: sum(orders) } })\n\n  return c.json({ user, orders 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completes:",[593,1446,1449],{"className":595,"code":1447,"filename":1448,"language":598,"meta":599,"style":599},"14:58:15 INFO [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n  ├─ orders: count=2 totalRevenue=6298\n  ├─ user: id=usr_123 name=Alice plan=pro\n  └─ requestId: 4a8ff3a8-...\n","Terminal output",[515,1450,1451,1462,1482,1498],{"__ignoreMap":599},[603,1452,1453,1456,1459],{"class":605,"line":606},[603,1454,1455],{"class":609},"14:58:15",[603,1457,1458],{"class":612}," INFO",[603,1460,1461],{"class":702}," [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n",[603,1463,1464,1467,1470,1473,1476,1479],{"class":605,"line":721},[603,1465,1466],{"class":609},"  ├─",[603,1468,1469],{"class":612}," orders:",[603,1471,1472],{"class":612}," count=",[603,1474,1475],{"class":1069},"2",[603,1477,1478],{"class":612}," totalRevenue=",[603,1480,1481],{"class":1069},"6298\n",[603,1483,1484,1486,1489,1492,1495],{"class":605,"line":742},[603,1485,1466],{"class":609},[603,1487,1488],{"class":612}," user:",[603,1490,1491],{"class":612}," id=usr_123",[603,1493,1494],{"class":612}," name=Alice",[603,1496,1497],{"class":612}," plan=pro\n",[603,1499,1500,1503,1506],{"class":605,"line":763},[603,1501,1502],{"class":609},"  └─",[603,1504,1505],{"class":612}," requestId:",[603,1507,1508],{"class":612}," 4a8ff3a8-...\n",[581,1510,1512],{"id":1511},"accessing-the-logger-deeper-in-the-stack","Accessing the logger deeper in the stack",[511,1514,1515,1517,1518,1520,1521,1523],{},[515,1516,521],{}," is the idiomatic accessor inside a route handler. Once you are a few\nlayers down — a service, a repository — threading ",[515,1519,937],{}," everywhere gets noisy. ",[515,1522,525],{},"\nresolves the same request logger without it:",[593,1525,1528],{"className":684,"code":1526,"filename":1527,"language":687,"meta":599,"style":599},"import { useLogger } from 'evlog\u002Fhono'\n\nexport async function chargeCard(amount: number) {\n  const log = useLogger()\n  log.set({ payment: { amount } })\n}\n","src\u002Fservices\u002Fpayment.ts",[515,1529,1530,1549,1553,1580,1592,1620],{"__ignoreMap":599},[603,1531,1532,1534,1536,1539,1541,1543,1545,1547],{"class":605,"line":606},[603,1533,695],{"class":694},[603,1535,699],{"class":698},[603,1537,1538],{"class":702}," useLogger",[603,1540,706],{"class":698},[603,1542,709],{"class":694},[603,1544,712],{"class":698},[603,1546,517],{"class":612},[603,1548,718],{"class":698},[603,1550,1551],{"class":605,"line":721},[603,1552,795],{"emptyLinePlaceholder":794},[603,1554,1555,1558,1560,1563,1566,1568,1571,1573,1576,1578],{"class":605,"line":742},[603,1556,1557],{"class":694},"export",[603,1559,1139],{"class":856},[603,1561,1562],{"class":856}," function",[603,1564,1565],{"class":801}," chargeCard",[603,1567,805],{"class":698},[603,1569,1570],{"class":936},"amount",[603,1572,818],{"class":698},[603,1574,1575],{"class":609}," number",[603,1577,940],{"class":698},[603,1579,946],{"class":698},[603,1581,1582,1584,1586,1588,1590],{"class":605,"line":763},[603,1583,1154],{"class":856},[603,1585,1157],{"class":702},[603,1587,1160],{"class":698},[603,1589,1538],{"class":801},[603,1591,880],{"class":814},[603,1593,1594,1596,1598,1600,1602,1604,1607,1609,1611,1614,1616,1618],{"class":605,"line":791},[603,1595,1217],{"class":702},[603,1597,894],{"class":698},[603,1599,972],{"class":801},[603,1601,805],{"class":814},[603,1603,977],{"class":698},[603,1605,1606],{"class":814}," payment",[603,1608,818],{"class":698},[603,1610,699],{"class":698},[603,1612,1613],{"class":702}," amount",[603,1615,706],{"class":698},[603,1617,706],{"class":698},[603,1619,845],{"class":814},[603,1621,1622],{"class":605,"line":798},[603,1623,1624],{"class":698},"}\n",[511,1626,1627],{},"Both return the same logger — pick whichever reads better at the call site.",[1076,1629,1630,1632,1633,1636,1637,1640,1641,1644,1645,1648,1649,1651],{"color":1078,"icon":13},[515,1631,525],{}," is backed by ",[515,1634,1635],{},"AsyncLocalStorage",". On Cloudflare Workers this requires the\n",[515,1638,1639],{},"nodejs_compat"," (or ",[515,1642,1643],{},"nodejs_als",") compatibility flag in ",[515,1646,1647],{},"wrangler.toml",". ",[515,1650,521],{},"\nworks with or without it, so deployments that cannot enable the flag keep using it.",[585,1653,1655],{"id":1654},"background-work","Background work",[511,1657,1658,1663,1664,818],{},[1080,1659,1660],{},[515,1661,1662],{},"log.fork()"," runs work under a child logger that emits its own wide event, correlated\nto the request via ",[515,1665,1666],{},"_parentRequestId",[593,1668,1670],{"className":684,"code":1669,"filename":686,"language":687,"meta":599,"style":599},"app.post('\u002Fapi\u002Forders', (c) => {\n  c.get('log').fork('send-receipt', async () => {\n    await sendReceipt()\n    useLogger().set({ email: { sent: true } })\n  })\n  return c.json({ ok: true })\n})\n",[515,1671,1672,1702,1745,1755,1791,1798,1822],{"__ignoreMap":599},[603,1673,1674,1676,1678,1681,1683,1685,1688,1690,1692,1694,1696,1698,1700],{"class":605,"line":606},[603,1675,891],{"class":702},[603,1677,894],{"class":698},[603,1679,1680],{"class":801},"post",[603,1682,805],{"class":702},[603,1684,833],{"class":698},[603,1686,1687],{"class":612},"\u002Fapi\u002Forders",[603,1689,833],{"class":698},[603,1691,772],{"class":698},[603,1693,933],{"class":698},[603,1695,937],{"class":936},[603,1697,940],{"class":698},[603,1699,943],{"class":856},[603,1701,946],{"class":698},[603,1703,1704,1706,1708,1710,1712,1714,1716,1718,1720,1722,1725,1727,1729,1732,1734,1736,1738,1741,1743],{"class":605,"line":721},[603,1705,952],{"class":702},[603,1707,894],{"class":698},[603,1709,919],{"class":801},[603,1711,805],{"class":814},[603,1713,833],{"class":698},[603,1715,963],{"class":612},[603,1717,833],{"class":698},[603,1719,940],{"class":814},[603,1721,894],{"class":698},[603,1723,1724],{"class":801},"fork",[603,1726,805],{"class":814},[603,1728,833],{"class":698},[603,1730,1731],{"class":612},"send-receipt",[603,1733,833],{"class":698},[603,1735,772],{"class":698},[603,1737,1139],{"class":856},[603,1739,1740],{"class":698}," ()",[603,1742,943],{"class":856},[603,1744,946],{"class":698},[603,1746,1747,1750,1753],{"class":605,"line":742},[603,1748,1749],{"class":694},"    await",[603,1751,1752],{"class":801}," sendReceipt",[603,1754,880],{"class":814},[603,1756,1757,1760,1763,1765,1767,1769,1771,1774,1776,1778,1781,1783,1785,1787,1789],{"class":605,"line":763},[603,1758,1759],{"class":801},"    useLogger",[603,1761,1762],{"class":814},"()",[603,1764,894],{"class":698},[603,1766,972],{"class":801},[603,1768,805],{"class":814},[603,1770,977],{"class":698},[603,1772,1773],{"class":814}," email",[603,1775,818],{"class":698},[603,1777,699],{"class":698},[603,1779,1780],{"class":814}," sent",[603,1782,818],{"class":698},[603,1784,1020],{"class":1019},[603,1786,706],{"class":698},[603,1788,706],{"class":698},[603,1790,845],{"class":814},[603,1792,1793,1796],{"class":605,"line":791},[603,1794,1795],{"class":698},"  }",[603,1797,845],{"class":814},[603,1799,1800,1802,1804,1806,1808,1810,1812,1814,1816,1818,1820],{"class":605,"line":798},[603,1801,999],{"class":694},[603,1803,1002],{"class":702},[603,1805,894],{"class":698},[603,1807,1007],{"class":801},[603,1809,805],{"class":814},[603,1811,977],{"class":698},[603,1813,1014],{"class":814},[603,1815,818],{"class":698},[603,1817,1020],{"class":1019},[603,1819,706],{"class":698},[603,1821,845],{"class":814},[603,1823,1824,1826],{"class":605,"line":811},[603,1825,842],{"class":698},[603,1827,845],{"class":702},[511,1829,1830,1831,1837,1838,1841,1842,894],{},"If you schedule async work after the response without forking, post-emit ",[1080,1832,1833,1836],{},[515,1834,1835],{},"[evlog]"," warnings","\nhelp you notice stale ",[515,1839,1840],{},"set()"," calls. See ",[570,1843,1845],{"href":1844},"\u002Flearn\u002Fwide-events#after-emit-sealing-and-background-work","Wide events — After emit",[581,1847,1849],{"id":1848},"error-handling","Error Handling",[511,1851,1852,1853,1856,1857,1860,1861,1864,1865,1868],{},"Use ",[515,1854,1855],{},"createError"," for structured errors with ",[515,1858,1859],{},"why",", ",[515,1862,1863],{},"fix",", and ",[515,1866,1867],{},"link"," fields:",[593,1870,1872],{"className":684,"code":1871,"filename":686,"language":687,"meta":599,"style":599},"import { createError, parseError } from 'evlog'\n\napp.get('\u002Fcheckout', (c) => {\n  const log = c.get('log')\n  log.set({ cart: { items: 3, total: 9999 } })\n\n  throw createError({\n    message: 'Payment failed',\n    status: 402,\n    why: 'Card declined by issuer',\n    fix: 'Try a different payment method',\n    link: 'https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined',\n  })\n})\n",[515,1873,1874,1898,1902,1931,1955,1998,2002,2013,2030,2042,2058,2074,2090,2096],{"__ignoreMap":599},[603,1875,1876,1878,1880,1883,1885,1888,1890,1892,1894,1896],{"class":605,"line":606},[603,1877,695],{"class":694},[603,1879,699],{"class":698},[603,1881,1882],{"class":702}," createError",[603,1884,772],{"class":698},[603,1886,1887],{"class":702}," parseError",[603,1889,706],{"class":698},[603,1891,709],{"class":694},[603,1893,712],{"class":698},[603,1895,758],{"class":612},[603,1897,718],{"class":698},[603,1899,1900],{"class":605,"line":721},[603,1901,795],{"emptyLinePlaceholder":794},[603,1903,1904,1906,1908,1910,1912,1914,1917,1919,1921,1923,1925,1927,1929],{"class":605,"line":742},[603,1905,891],{"class":702},[603,1907,894],{"class":698},[603,1909,919],{"class":801},[603,1911,805],{"class":702},[603,1913,833],{"class":698},[603,1915,1916],{"class":612},"\u002Fcheckout",[603,1918,833],{"class":698},[603,1920,772],{"class":698},[603,1922,933],{"class":698},[603,1924,937],{"class":936},[603,1926,940],{"class":698},[603,1928,943],{"class":856},[603,1930,946],{"class":698},[603,1932,1933,1935,1937,1939,1941,1943,1945,1947,1949,1951,1953],{"class":605,"line":763},[603,1934,1154],{"class":856},[603,1936,1157],{"class":702},[603,1938,1160],{"class":698},[603,1940,1002],{"class":702},[603,1942,894],{"class":698},[603,1944,919],{"class":801},[603,1946,805],{"class":814},[603,1948,833],{"class":698},[603,1950,963],{"class":612},[603,1952,833],{"class":698},[603,1954,845],{"class":814},[603,1956,1957,1959,1961,1963,1965,1967,1970,1972,1974,1977,1979,1982,1984,1987,1989,1992,1994,1996],{"class":605,"line":791},[603,1958,1217],{"class":702},[603,1960,894],{"class":698},[603,1962,972],{"class":801},[603,1964,805],{"class":814},[603,1966,977],{"class":698},[603,1968,1969],{"class":814}," cart",[603,1971,818],{"class":698},[603,1973,699],{"class":698},[603,1975,1976],{"class":814}," items",[603,1978,818],{"class":698},[603,1980,1981],{"class":1069}," 3",[603,1983,772],{"class":698},[603,1985,1986],{"class":814}," total",[603,1988,818],{"class":698},[603,1990,1991],{"class":1069}," 9999",[603,1993,706],{"class":698},[603,1995,706],{"class":698},[603,1997,845],{"class":814},[603,1999,2000],{"class":605,"line":798},[603,2001,795],{"emptyLinePlaceholder":794},[603,2003,2004,2007,2009,2011],{"class":605,"line":811},[603,2005,2006],{"class":694},"  throw",[603,2008,1882],{"class":801},[603,2010,805],{"class":814},[603,2012,808],{"class":698},[603,2014,2015,2018,2020,2022,2025,2027],{"class":605,"line":839},[603,2016,2017],{"class":814},"    message",[603,2019,818],{"class":698},[603,2021,712],{"class":698},[603,2023,2024],{"class":612},"Payment failed",[603,2026,833],{"class":698},[603,2028,2029],{"class":698},",\n",[603,2031,2032,2035,2037,2040],{"class":605,"line":848},[603,2033,2034],{"class":814},"    status",[603,2036,818],{"class":698},[603,2038,2039],{"class":1069}," 402",[603,2041,2029],{"class":698},[603,2043,2044,2047,2049,2051,2054,2056],{"class":605,"line":853},[603,2045,2046],{"class":814},"    why",[603,2048,818],{"class":698},[603,2050,712],{"class":698},[603,2052,2053],{"class":612},"Card declined by issuer",[603,2055,833],{"class":698},[603,2057,2029],{"class":698},[603,2059,2060,2063,2065,2067,2070,2072],{"class":605,"line":883},[603,2061,2062],{"class":814},"    fix",[603,2064,818],{"class":698},[603,2066,712],{"class":698},[603,2068,2069],{"class":612},"Try a different payment method",[603,2071,833],{"class":698},[603,2073,2029],{"class":698},[603,2075,2076,2079,2081,2083,2086,2088],{"class":605,"line":888},[603,2077,2078],{"class":814},"    link",[603,2080,818],{"class":698},[603,2082,712],{"class":698},[603,2084,2085],{"class":612},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[603,2087,833],{"class":698},[603,2089,2029],{"class":698},[603,2091,2092,2094],{"class":605,"line":907},[603,2093,1795],{"class":698},[603,2095,845],{"class":814},[603,2097,2098,2100],{"class":605,"line":912},[603,2099,842],{"class":698},[603,2101,845],{"class":702},[511,2103,2104,2105,2108],{},"Handle errors globally with ",[515,2106,2107],{},"app.onError"," to return structured JSON responses:",[593,2110,2112],{"className":684,"code":2111,"filename":686,"language":687,"meta":599,"style":599},"import type { ContentfulStatusCode } from 'hono\u002Futils\u002Fhttp-status'\n\napp.onError((error, c) => {\n  c.get('log').error(error)\n  const parsed = parseError(error)\n\n  return c.json(\n    {\n      message: parsed.message,\n      why: parsed.why,\n      fix: parsed.fix,\n      link: parsed.link,\n    },\n    parsed.status as ContentfulStatusCode,\n  )\n})\n",[515,2113,2114,2136,2140,2166,2194,2211,2215,2228,2233,2249,2264,2279,2294,2299,2316,2321],{"__ignoreMap":599},[603,2115,2116,2118,2120,2122,2125,2127,2129,2131,2134],{"class":605,"line":606},[603,2117,695],{"class":694},[603,2119,775],{"class":694},[603,2121,699],{"class":698},[603,2123,2124],{"class":702}," ContentfulStatusCode",[603,2126,706],{"class":698},[603,2128,709],{"class":694},[603,2130,712],{"class":698},[603,2132,2133],{"class":612},"hono\u002Futils\u002Fhttp-status",[603,2135,718],{"class":698},[603,2137,2138],{"class":605,"line":721},[603,2139,795],{"emptyLinePlaceholder":794},[603,2141,2142,2144,2146,2149,2151,2153,2156,2158,2160,2162,2164],{"class":605,"line":742},[603,2143,891],{"class":702},[603,2145,894],{"class":698},[603,2147,2148],{"class":801},"onError",[603,2150,805],{"class":702},[603,2152,805],{"class":698},[603,2154,2155],{"class":936},"error",[603,2157,772],{"class":698},[603,2159,1002],{"class":936},[603,2161,940],{"class":698},[603,2163,943],{"class":856},[603,2165,946],{"class":698},[603,2167,2168,2170,2172,2174,2176,2178,2180,2182,2184,2186,2188,2190,2192],{"class":605,"line":763},[603,2169,952],{"class":702},[603,2171,894],{"class":698},[603,2173,919],{"class":801},[603,2175,805],{"class":814},[603,2177,833],{"class":698},[603,2179,963],{"class":612},[603,2181,833],{"class":698},[603,2183,940],{"class":814},[603,2185,894],{"class":698},[603,2187,2155],{"class":801},[603,2189,805],{"class":814},[603,2191,2155],{"class":702},[603,2193,845],{"class":814},[603,2195,2196,2198,2201,2203,2205,2207,2209],{"class":605,"line":791},[603,2197,1154],{"class":856},[603,2199,2200],{"class":702}," parsed",[603,2202,1160],{"class":698},[603,2204,1887],{"class":801},[603,2206,805],{"class":814},[603,2208,2155],{"class":702},[603,2210,845],{"class":814},[603,2212,2213],{"class":605,"line":798},[603,2214,795],{"emptyLinePlaceholder":794},[603,2216,2217,2219,2221,2223,2225],{"class":605,"line":811},[603,2218,999],{"class":694},[603,2220,1002],{"class":702},[603,2222,894],{"class":698},[603,2224,1007],{"class":801},[603,2226,2227],{"class":814},"(\n",[603,2229,2230],{"class":605,"line":839},[603,2231,2232],{"class":698},"    {\n",[603,2234,2235,2238,2240,2242,2244,2247],{"class":605,"line":848},[603,2236,2237],{"class":814},"      message",[603,2239,818],{"class":698},[603,2241,2200],{"class":702},[603,2243,894],{"class":698},[603,2245,2246],{"class":702},"message",[603,2248,2029],{"class":698},[603,2250,2251,2254,2256,2258,2260,2262],{"class":605,"line":853},[603,2252,2253],{"class":814},"      why",[603,2255,818],{"class":698},[603,2257,2200],{"class":702},[603,2259,894],{"class":698},[603,2261,1859],{"class":702},[603,2263,2029],{"class":698},[603,2265,2266,2269,2271,2273,2275,2277],{"class":605,"line":883},[603,2267,2268],{"class":814},"      fix",[603,2270,818],{"class":698},[603,2272,2200],{"class":702},[603,2274,894],{"class":698},[603,2276,1863],{"class":702},[603,2278,2029],{"class":698},[603,2280,2281,2284,2286,2288,2290,2292],{"class":605,"line":888},[603,2282,2283],{"class":814},"      link",[603,2285,818],{"class":698},[603,2287,2200],{"class":702},[603,2289,894],{"class":698},[603,2291,1867],{"class":702},[603,2293,2029],{"class":698},[603,2295,2296],{"class":605,"line":907},[603,2297,2298],{"class":698},"    },\n",[603,2300,2301,2304,2306,2309,2312,2314],{"class":605,"line":912},[603,2302,2303],{"class":702},"    parsed",[603,2305,894],{"class":698},[603,2307,2308],{"class":702},"status",[603,2310,2311],{"class":694}," as",[603,2313,2124],{"class":609},[603,2315,2029],{"class":698},[603,2317,2318],{"class":605,"line":949},[603,2319,2320],{"class":814},"  )\n",[603,2322,2323,2325],{"class":605,"line":996},[603,2324,842],{"class":698},[603,2326,845],{"class":702},[511,2328,2329,2332,2333,2335,2336,2339,2340,2343,2344,2347],{},[515,2330,2331],{},"parseError()"," types ",[515,2334,2308],{}," as a ",[515,2337,2338],{},"number",", while Hono’s ",[515,2341,2342],{},"c.json()"," second argument expects ",[515,2345,2346],{},"ContentfulStatusCode",". The cast matches what you already return at runtime and satisfies TypeScript.",[511,2349,2350],{},"The error is captured and logged with both the custom context and structured error fields:",[593,2352,2354],{"className":595,"code":2353,"filename":1448,"language":598,"meta":599,"style":599},"14:58:20 ERROR [my-api] GET \u002Fcheckout 402 in 3ms\n  ├─ error: name=EvlogError message=Payment failed status=402\n  ├─ cart: items=3 total=9999\n  └─ requestId: 880a50ac-...\n",[515,2355,2356,2367,2389,2408],{"__ignoreMap":599},[603,2357,2358,2361,2364],{"class":605,"line":606},[603,2359,2360],{"class":609},"14:58:20",[603,2362,2363],{"class":612}," ERROR",[603,2365,2366],{"class":702}," [my-api] GET \u002Fcheckout 402 in 3ms\n",[603,2368,2369,2371,2374,2377,2380,2383,2386],{"class":605,"line":721},[603,2370,1466],{"class":609},[603,2372,2373],{"class":612}," error:",[603,2375,2376],{"class":612}," name=EvlogError",[603,2378,2379],{"class":612}," message=Payment",[603,2381,2382],{"class":612}," failed",[603,2384,2385],{"class":612}," status=",[603,2387,2388],{"class":1069},"402\n",[603,2390,2391,2393,2396,2399,2402,2405],{"class":605,"line":742},[603,2392,1466],{"class":609},[603,2394,2395],{"class":612}," cart:",[603,2397,2398],{"class":612}," items=",[603,2400,2401],{"class":1069},"3",[603,2403,2404],{"class":612}," total=",[603,2406,2407],{"class":1069},"9999\n",[603,2409,2410,2412,2414],{"class":605,"line":763},[603,2411,1502],{"class":609},[603,2413,1505],{"class":612},[603,2415,2416],{"class":612}," 880a50ac-...\n",[581,2418,480],{"id":2419},"configuration",[511,2421,2422,2423,2426,2427,2429],{},"See the ",[570,2424,2425],{"href":481},"Configuration reference"," for all available options (",[515,2428,802],{},", middleware options, sampling, silent mode, etc.).",[581,2431,2433],{"id":2432},"drain-enrichers","Drain & Enrichers",[511,2435,2436],{},"Configure drain adapters and enrichers directly in the middleware options:",[593,2438,2440],{"className":684,"code":2439,"filename":686,"language":687,"meta":599,"style":599},"import { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createUserAgentEnricher } from 'evlog\u002Fenrichers'\n\nconst userAgent = createUserAgentEnricher()\n\napp.use(evlog({\n  drain: createAxiomDrain(),\n  enrich: (ctx) => {\n    userAgent(ctx)\n    ctx.event.region = process.env.FLY_REGION\n  },\n}))\n",[515,2441,2442,2462,2482,2486,2499,2503,2519,2532,2550,2561,2591,2596],{"__ignoreMap":599},[603,2443,2444,2446,2448,2451,2453,2455,2457,2460],{"class":605,"line":606},[603,2445,695],{"class":694},[603,2447,699],{"class":698},[603,2449,2450],{"class":702}," createAxiomDrain",[603,2452,706],{"class":698},[603,2454,709],{"class":694},[603,2456,712],{"class":698},[603,2458,2459],{"class":612},"evlog\u002Faxiom",[603,2461,718],{"class":698},[603,2463,2464,2466,2468,2471,2473,2475,2477,2480],{"class":605,"line":721},[603,2465,695],{"class":694},[603,2467,699],{"class":698},[603,2469,2470],{"class":702}," createUserAgentEnricher",[603,2472,706],{"class":698},[603,2474,709],{"class":694},[603,2476,712],{"class":698},[603,2478,2479],{"class":612},"evlog\u002Fenrichers",[603,2481,718],{"class":698},[603,2483,2484],{"class":605,"line":742},[603,2485,795],{"emptyLinePlaceholder":794},[603,2487,2488,2490,2493,2495,2497],{"class":605,"line":763},[603,2489,857],{"class":856},[603,2491,2492],{"class":702}," userAgent ",[603,2494,863],{"class":698},[603,2496,2470],{"class":801},[603,2498,880],{"class":702},[603,2500,2501],{"class":605,"line":791},[603,2502,795],{"emptyLinePlaceholder":794},[603,2504,2505,2507,2509,2511,2513,2515,2517],{"class":605,"line":798},[603,2506,891],{"class":702},[603,2508,894],{"class":698},[603,2510,897],{"class":801},[603,2512,805],{"class":702},[603,2514,758],{"class":801},[603,2516,805],{"class":702},[603,2518,808],{"class":698},[603,2520,2521,2524,2526,2528,2530],{"class":605,"line":811},[603,2522,2523],{"class":814},"  drain",[603,2525,818],{"class":698},[603,2527,2450],{"class":801},[603,2529,1762],{"class":702},[603,2531,2029],{"class":698},[603,2533,2534,2537,2539,2541,2544,2546,2548],{"class":605,"line":839},[603,2535,2536],{"class":801},"  enrich",[603,2538,818],{"class":698},[603,2540,933],{"class":698},[603,2542,2543],{"class":936},"ctx",[603,2545,940],{"class":698},[603,2547,943],{"class":856},[603,2549,946],{"class":698},[603,2551,2552,2555,2557,2559],{"class":605,"line":848},[603,2553,2554],{"class":801},"    userAgent",[603,2556,805],{"class":814},[603,2558,2543],{"class":702},[603,2560,845],{"class":814},[603,2562,2563,2566,2568,2571,2573,2576,2578,2581,2583,2586,2588],{"class":605,"line":853},[603,2564,2565],{"class":702},"    ctx",[603,2567,894],{"class":698},[603,2569,2570],{"class":702},"event",[603,2572,894],{"class":698},[603,2574,2575],{"class":702},"region",[603,2577,1160],{"class":698},[603,2579,2580],{"class":702}," process",[603,2582,894],{"class":698},[603,2584,2585],{"class":702},"env",[603,2587,894],{"class":698},[603,2589,2590],{"class":702},"FLY_REGION\n",[603,2592,2593],{"class":605,"line":883},[603,2594,2595],{"class":698},"  },\n",[603,2597,2598,2600],{"class":605,"line":888},[603,2599,842],{"class":698},[603,2601,2602],{"class":702},"))\n",[585,2604,2606],{"id":2605},"pipeline-batching-retry","Pipeline (Batching & Retry)",[511,2608,2609,2610,2613],{},"For production, wrap your adapter with ",[515,2611,2612],{},"createDrainPipeline"," to batch events and retry on failure:",[593,2615,2617],{"className":684,"code":2616,"filename":686,"language":687,"meta":599,"style":599},"import type { DrainContext } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createDrainPipeline } from 'evlog\u002Fpipeline'\n\nconst pipeline = createDrainPipeline\u003CDrainContext>({\n  batch: { size: 50, intervalMs: 5000 },\n  retry: { maxAttempts: 3 },\n})\nconst drain = pipeline(createAxiomDrain())\n\napp.use(evlog({ drain }))\n",[515,2618,2619,2640,2658,2678,2682,2704,2733,2751,2757,2776,2780],{"__ignoreMap":599},[603,2620,2621,2623,2625,2627,2630,2632,2634,2636,2638],{"class":605,"line":606},[603,2622,695],{"class":694},[603,2624,775],{"class":694},[603,2626,699],{"class":698},[603,2628,2629],{"class":702}," DrainContext",[603,2631,706],{"class":698},[603,2633,709],{"class":694},[603,2635,712],{"class":698},[603,2637,758],{"class":612},[603,2639,718],{"class":698},[603,2641,2642,2644,2646,2648,2650,2652,2654,2656],{"class":605,"line":721},[603,2643,695],{"class":694},[603,2645,699],{"class":698},[603,2647,2450],{"class":702},[603,2649,706],{"class":698},[603,2651,709],{"class":694},[603,2653,712],{"class":698},[603,2655,2459],{"class":612},[603,2657,718],{"class":698},[603,2659,2660,2662,2664,2667,2669,2671,2673,2676],{"class":605,"line":742},[603,2661,695],{"class":694},[603,2663,699],{"class":698},[603,2665,2666],{"class":702}," createDrainPipeline",[603,2668,706],{"class":698},[603,2670,709],{"class":694},[603,2672,712],{"class":698},[603,2674,2675],{"class":612},"evlog\u002Fpipeline",[603,2677,718],{"class":698},[603,2679,2680],{"class":605,"line":763},[603,2681,795],{"emptyLinePlaceholder":794},[603,2683,2684,2686,2689,2691,2693,2695,2698,2700,2702],{"class":605,"line":791},[603,2685,857],{"class":856},[603,2687,2688],{"class":702}," pipeline ",[603,2690,863],{"class":698},[603,2692,2666],{"class":801},[603,2694,871],{"class":698},[603,2696,2697],{"class":609},"DrainContext",[603,2699,877],{"class":698},[603,2701,805],{"class":702},[603,2703,808],{"class":698},[603,2705,2706,2709,2711,2713,2716,2718,2721,2723,2726,2728,2731],{"class":605,"line":798},[603,2707,2708],{"class":814},"  batch",[603,2710,818],{"class":698},[603,2712,699],{"class":698},[603,2714,2715],{"class":814}," size",[603,2717,818],{"class":698},[603,2719,2720],{"class":1069}," 50",[603,2722,772],{"class":698},[603,2724,2725],{"class":814}," intervalMs",[603,2727,818],{"class":698},[603,2729,2730],{"class":1069}," 5000",[603,2732,836],{"class":698},[603,2734,2735,2738,2740,2742,2745,2747,2749],{"class":605,"line":811},[603,2736,2737],{"class":814},"  retry",[603,2739,818],{"class":698},[603,2741,699],{"class":698},[603,2743,2744],{"class":814}," maxAttempts",[603,2746,818],{"class":698},[603,2748,1981],{"class":1069},[603,2750,836],{"class":698},[603,2752,2753,2755],{"class":605,"line":839},[603,2754,842],{"class":698},[603,2756,845],{"class":702},[603,2758,2759,2761,2764,2766,2769,2771,2774],{"class":605,"line":848},[603,2760,857],{"class":856},[603,2762,2763],{"class":702}," drain ",[603,2765,863],{"class":698},[603,2767,2768],{"class":801}," pipeline",[603,2770,805],{"class":702},[603,2772,2773],{"class":801},"createAxiomDrain",[603,2775,904],{"class":702},[603,2777,2778],{"class":605,"line":853},[603,2779,795],{"emptyLinePlaceholder":794},[603,2781,2782,2784,2786,2788,2790,2792,2794,2796,2798,2800],{"class":605,"line":883},[603,2783,891],{"class":702},[603,2785,894],{"class":698},[603,2787,897],{"class":801},[603,2789,805],{"class":702},[603,2791,758],{"class":801},[603,2793,805],{"class":702},[603,2795,977],{"class":698},[603,2797,2763],{"class":702},[603,2799,842],{"class":698},[603,2801,2602],{"class":702},[1076,2803,2804,2805,2808,2809,2812],{"color":1078,"icon":13},"Call ",[515,2806,2807],{},"drain.flush()"," on server shutdown to ensure all buffered events are sent. See the ",[570,2810,2811],{"href":472},"Pipeline docs"," for all options.",[581,2814,2816],{"id":2815},"tail-sampling","Tail Sampling",[511,2818,1852,2819,2822],{},[515,2820,2821],{},"keep"," to force-retain specific events regardless of head sampling:",[593,2824,2826],{"className":684,"code":2825,"filename":686,"language":687,"meta":599,"style":599},"app.use(evlog({\n  drain: createAxiomDrain(),\n  keep: (ctx) => {\n    if (ctx.duration && ctx.duration > 2000) ctx.shouldKeep = true\n  },\n}))\n",[515,2827,2828,2844,2856,2873,2917,2921],{"__ignoreMap":599},[603,2829,2830,2832,2834,2836,2838,2840,2842],{"class":605,"line":606},[603,2831,891],{"class":702},[603,2833,894],{"class":698},[603,2835,897],{"class":801},[603,2837,805],{"class":702},[603,2839,758],{"class":801},[603,2841,805],{"class":702},[603,2843,808],{"class":698},[603,2845,2846,2848,2850,2852,2854],{"class":605,"line":721},[603,2847,2523],{"class":814},[603,2849,818],{"class":698},[603,2851,2450],{"class":801},[603,2853,1762],{"class":702},[603,2855,2029],{"class":698},[603,2857,2858,2861,2863,2865,2867,2869,2871],{"class":605,"line":742},[603,2859,2860],{"class":801},"  keep",[603,2862,818],{"class":698},[603,2864,933],{"class":698},[603,2866,2543],{"class":936},[603,2868,940],{"class":698},[603,2870,943],{"class":856},[603,2872,946],{"class":698},[603,2874,2875,2878,2880,2882,2884,2887,2890,2893,2895,2897,2900,2903,2905,2907,2909,2912,2914],{"class":605,"line":763},[603,2876,2877],{"class":694},"    if",[603,2879,933],{"class":814},[603,2881,2543],{"class":702},[603,2883,894],{"class":698},[603,2885,2886],{"class":702},"duration",[603,2888,2889],{"class":698}," &&",[603,2891,2892],{"class":702}," ctx",[603,2894,894],{"class":698},[603,2896,2886],{"class":702},[603,2898,2899],{"class":698}," >",[603,2901,2902],{"class":1069}," 2000",[603,2904,1401],{"class":814},[603,2906,2543],{"class":702},[603,2908,894],{"class":698},[603,2910,2911],{"class":702},"shouldKeep",[603,2913,1160],{"class":698},[603,2915,2916],{"class":1019}," true\n",[603,2918,2919],{"class":605,"line":791},[603,2920,2595],{"class":698},[603,2922,2923,2925],{"class":605,"line":798},[603,2924,842],{"class":698},[603,2926,2602],{"class":702},[581,2928,2930],{"id":2929},"route-filtering","Route Filtering",[511,2932,2933,2934,2937,2938,2941],{},"Control which routes are logged with ",[515,2935,2936],{},"include"," and ",[515,2939,2940],{},"exclude"," patterns:",[593,2943,2945],{"className":684,"code":2944,"filename":686,"language":687,"meta":599,"style":599},"app.use(evlog({\n  include: ['\u002Fapi\u002F**'],\n  exclude: ['\u002F_internal\u002F**', '\u002Fhealth'],\n  routes: {\n    '\u002Fapi\u002Fauth\u002F**': { service: 'auth-service' },\n    '\u002Fapi\u002Fpayment\u002F**': { service: 'payment-service' },\n  },\n}))\n",[515,2946,2947,2963,2985,3013,3022,3049,3075,3079],{"__ignoreMap":599},[603,2948,2949,2951,2953,2955,2957,2959,2961],{"class":605,"line":606},[603,2950,891],{"class":702},[603,2952,894],{"class":698},[603,2954,897],{"class":801},[603,2956,805],{"class":702},[603,2958,758],{"class":801},[603,2960,805],{"class":702},[603,2962,808],{"class":698},[603,2964,2965,2968,2970,2973,2975,2978,2980,2983],{"class":605,"line":721},[603,2966,2967],{"class":814},"  include",[603,2969,818],{"class":698},[603,2971,2972],{"class":702}," [",[603,2974,833],{"class":698},[603,2976,2977],{"class":612},"\u002Fapi\u002F**",[603,2979,833],{"class":698},[603,2981,2982],{"class":702},"]",[603,2984,2029],{"class":698},[603,2986,2987,2990,2992,2994,2996,2999,3001,3003,3005,3007,3009,3011],{"class":605,"line":742},[603,2988,2989],{"class":814},"  exclude",[603,2991,818],{"class":698},[603,2993,2972],{"class":702},[603,2995,833],{"class":698},[603,2997,2998],{"class":612},"\u002F_internal\u002F**",[603,3000,833],{"class":698},[603,3002,772],{"class":698},[603,3004,712],{"class":698},[603,3006,926],{"class":612},[603,3008,833],{"class":698},[603,3010,2982],{"class":702},[603,3012,2029],{"class":698},[603,3014,3015,3018,3020],{"class":605,"line":763},[603,3016,3017],{"class":814},"  routes",[603,3019,818],{"class":698},[603,3021,946],{"class":698},[603,3023,3024,3027,3030,3032,3034,3036,3038,3040,3042,3045,3047],{"class":605,"line":791},[603,3025,3026],{"class":698},"    '",[603,3028,3029],{"class":814},"\u002Fapi\u002Fauth\u002F**",[603,3031,833],{"class":698},[603,3033,818],{"class":698},[603,3035,699],{"class":698},[603,3037,823],{"class":814},[603,3039,818],{"class":698},[603,3041,712],{"class":698},[603,3043,3044],{"class":612},"auth-service",[603,3046,833],{"class":698},[603,3048,836],{"class":698},[603,3050,3051,3053,3056,3058,3060,3062,3064,3066,3068,3071,3073],{"class":605,"line":798},[603,3052,3026],{"class":698},[603,3054,3055],{"class":814},"\u002Fapi\u002Fpayment\u002F**",[603,3057,833],{"class":698},[603,3059,818],{"class":698},[603,3061,699],{"class":698},[603,3063,823],{"class":814},[603,3065,818],{"class":698},[603,3067,712],{"class":698},[603,3069,3070],{"class":612},"payment-service",[603,3072,833],{"class":698},[603,3074,836],{"class":698},[603,3076,3077],{"class":605,"line":811},[603,3078,2595],{"class":698},[603,3080,3081,3083],{"class":605,"line":839},[603,3082,842],{"class":698},[603,3084,2602],{"class":702},[581,3086,3088],{"id":3087},"client-side-logging","Client-Side Logging",[511,3090,1852,3091,3094],{},[515,3092,3093],{},"evlog\u002Fhttp"," to send structured logs from any frontend to your Hono server. This works with any client framework (React, Vue, Svelte, vanilla JS).",[585,3096,3098],{"id":3097},"browser-setup","Browser setup",[593,3100,3103],{"className":684,"code":3101,"filename":3102,"language":687,"meta":599,"style":599},"import { initLogger, log } from 'evlog'\nimport { createHttpLogDrain } from 'evlog\u002Fhttp'\n\nconst drain = createHttpLogDrain({\n  drain: { endpoint: '\u002Fv1\u002Fingest' },\n})\ninitLogger({ drain })\n\nlog.info({ action: 'page_view', path: location.pathname })\n","client.ts",[515,3104,3105,3127,3146,3150,3164,3186,3192,3206,3210],{"__ignoreMap":599},[603,3106,3107,3109,3111,3113,3115,3117,3119,3121,3123,3125],{"class":605,"line":606},[603,3108,695],{"class":694},[603,3110,699],{"class":698},[603,3112,749],{"class":702},[603,3114,772],{"class":698},[603,3116,1157],{"class":702},[603,3118,706],{"class":698},[603,3120,709],{"class":694},[603,3122,712],{"class":698},[603,3124,758],{"class":612},[603,3126,718],{"class":698},[603,3128,3129,3131,3133,3136,3138,3140,3142,3144],{"class":605,"line":721},[603,3130,695],{"class":694},[603,3132,699],{"class":698},[603,3134,3135],{"class":702}," createHttpLogDrain",[603,3137,706],{"class":698},[603,3139,709],{"class":694},[603,3141,712],{"class":698},[603,3143,3093],{"class":612},[603,3145,718],{"class":698},[603,3147,3148],{"class":605,"line":742},[603,3149,795],{"emptyLinePlaceholder":794},[603,3151,3152,3154,3156,3158,3160,3162],{"class":605,"line":763},[603,3153,857],{"class":856},[603,3155,2763],{"class":702},[603,3157,863],{"class":698},[603,3159,3135],{"class":801},[603,3161,805],{"class":702},[603,3163,808],{"class":698},[603,3165,3166,3168,3170,3172,3175,3177,3179,3182,3184],{"class":605,"line":791},[603,3167,2523],{"class":814},[603,3169,818],{"class":698},[603,3171,699],{"class":698},[603,3173,3174],{"class":814}," endpoint",[603,3176,818],{"class":698},[603,3178,712],{"class":698},[603,3180,3181],{"class":612},"\u002Fv1\u002Fingest",[603,3183,833],{"class":698},[603,3185,836],{"class":698},[603,3187,3188,3190],{"class":605,"line":798},[603,3189,842],{"class":698},[603,3191,845],{"class":702},[603,3193,3194,3196,3198,3200,3202,3204],{"class":605,"line":811},[603,3195,802],{"class":801},[603,3197,805],{"class":702},[603,3199,977],{"class":698},[603,3201,2763],{"class":702},[603,3203,842],{"class":698},[603,3205,845],{"class":702},[603,3207,3208],{"class":605,"line":839},[603,3209,795],{"emptyLinePlaceholder":794},[603,3211,3212,3214,3216,3218,3220,3222,3225,3227,3229,3232,3234,3236,3239,3241,3244,3246,3249,3251],{"class":605,"line":848},[603,3213,963],{"class":702},[603,3215,894],{"class":698},[603,3217,1078],{"class":801},[603,3219,805],{"class":702},[603,3221,977],{"class":698},[603,3223,3224],{"class":814}," 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your ",[1080,3526,245],{}," integration:",[536,3529,3530,3535,3540,3545],{},[539,3531,3532,3534],{},[570,3533,46],{"href":47},": Design comprehensive events with context layering",[539,3536,3537,3539],{},[570,3538,133],{"href":138},": Send logs to Axiom, Sentry, PostHog, and more",[539,3541,3542,3544],{},[570,3543,61],{"href":62},": Control log volume with head and tail sampling",[539,3546,3547,3549,3550,1860,3552,1864,3554,3556],{},[570,3548,51],{"href":52},": Throw errors with ",[515,3551,1859],{},[515,3553,1863],{},[515,3555,1867],{}," fields",[3558,3559,3560],"style",{},"html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: 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