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Use them to automatically extract useful information from request headers without cluttering your application code.",[558,559],"enricher-chain",{},[561,562,565,568,601],"prompt",{":actions":563,"description":564,"icon":28},"[\"copy\",\"cursor\",\"windsurf\"]","Add evlog enrichers to my app",[554,566,567],{},"Add evlog enrichers to my app so wide events automatically include derived context.",[569,570,571,575,578,581,589,595,598],"ul",{},[572,573,574],"li",{},"Identify my framework and follow its evlog wiring pattern",[572,576,577],{},"Import the enrichers I need from 'evlog\u002Fenrichers' (createUserAgentEnricher, createGeoEnricher, createRequestSizeEnricher, createTraceContextEnricher)",[572,579,580],{},"For Nuxt\u002FNitro: register them on the evlog:enrich hook in a server plugin",[572,582,583,584,588],{},"For Hono\u002FExpress\u002FFastify\u002FElysia\u002FNestJS: pass them as { enrichers: ",[585,586,587],"span",{},"..."," } to the middleware",[572,590,591,592,594],{},"For Standalone: pass them to initLogger({ enrichers: ",[585,593,587],{}," })",[572,596,597],{},"Enrichers run after emit and before the drain — they only add fields, never throw",[572,599,600],{},"Pass { overwrite: true } if I want enrichers to override fields I set manually",[554,602,603,604,610,611],{},"Docs: ",[605,606,607],"a",{"href":607,"rel":608},"https:\u002F\u002Fwww.evlog.dev\u002Fenrichers\u002Foverview",[609],"nofollow","\nBuilt-in: ",[605,612,613],{"href":613,"rel":614},"https:\u002F\u002Fwww.evlog.dev\u002Fenrichers\u002Fbuilt-in",[609],[616,617,619],"h2",{"id":618},"how-enrichers-work","How Enrichers Work",[554,621,622,623,627,628,631],{},"Enrichers hook into the ",[624,625,626],"code",{},"evlog:enrich"," event, which fires after a wide event is emitted and before the ",[624,629,630],{},"evlog:drain"," hook. The enricher receives the event and request metadata, and can mutate the event to add derived fields.",[633,634,639],"pre",{"className":635,"code":637,"language":638},[636],"language-text","Request → emit() → evlog:enrich → evlog:drain\n                    ↑ enrichers      ↑ adapters\n                    add context      send to services\n","text",[624,640,637],{"__ignoreMap":641},"",[643,644,645,859,1051,1158],"code-group",{},[633,646,651],{"className":647,"code":648,"filename":649,"language":650,"meta":641,"style":641},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u002F\u002F server\u002Fplugins\u002Fevlog-enrich.ts\nimport { createUserAgentEnricher, createGeoEnricher } from 'evlog\u002Fenrichers'\n\nexport default defineNitroPlugin((nitroApp) => {\n  const enrichers = [createUserAgentEnricher(), createGeoEnricher()]\n\n  nitroApp.hooks.hook('evlog:enrich', (ctx) => {\n    for (const enricher of enrichers) enricher(ctx)\n  })\n})\n","Nuxt \u002F Nitro","typescript",[624,652,653,661,698,705,737,766,771,811,843,851],{"__ignoreMap":641},[585,654,657],{"class":655,"line":656},"line",1,[585,658,660],{"class":659},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog-enrich.ts\n",[585,662,664,668,672,676,679,682,685,688,691,695],{"class":655,"line":663},2,[585,665,667],{"class":666},"s7zQu","import",[585,669,671],{"class":670},"sMK4o"," {",[585,673,675],{"class":674},"sTEyZ"," createUserAgentEnricher",[585,677,678],{"class":670},",",[585,680,681],{"class":674}," createGeoEnricher",[585,683,684],{"class":670}," }",[585,686,687],{"class":666}," from",[585,689,690],{"class":670}," '",[585,692,694],{"class":693},"sfazB","evlog\u002Fenrichers",[585,696,697],{"class":670},"'\n",[585,699,701],{"class":655,"line":700},3,[585,702,704],{"emptyLinePlaceholder":703},true,"\n",[585,706,708,711,714,718,721,723,727,730,734],{"class":655,"line":707},4,[585,709,710],{"class":666},"export",[585,712,713],{"class":666}," default",[585,715,717],{"class":716},"s2Zo4"," defineNitroPlugin",[585,719,720],{"class":674},"(",[585,722,720],{"class":670},[585,724,726],{"class":725},"sHdIc","nitroApp",[585,728,729],{"class":670},")",[585,731,733],{"class":732},"spNyl"," =>",[585,735,736],{"class":670}," {\n",[585,738,740,743,746,749,753,756,759,761,763],{"class":655,"line":739},5,[585,741,742],{"class":732},"  const",[585,744,745],{"class":674}," enrichers",[585,747,748],{"class":670}," =",[585,750,752],{"class":751},"swJcz"," [",[585,754,755],{"class":716},"createUserAgentEnricher",[585,757,758],{"class":751},"()",[585,760,678],{"class":670},[585,762,681],{"class":716},[585,764,765],{"class":751},"()]\n",[585,767,769],{"class":655,"line":768},6,[585,770,704],{"emptyLinePlaceholder":703},[585,772,774,777,780,783,785,788,790,793,795,797,799,802,805,807,809],{"class":655,"line":773},7,[585,775,776],{"class":674},"  nitroApp",[585,778,779],{"class":670},".",[585,781,782],{"class":674},"hooks",[585,784,779],{"class":670},[585,786,787],{"class":716},"hook",[585,789,720],{"class":751},[585,791,792],{"class":670},"'",[585,794,626],{"class":693},[585,796,792],{"class":670},[585,798,678],{"class":670},[585,800,801],{"class":670}," (",[585,803,804],{"class":725},"ctx",[585,806,729],{"class":670},[585,808,733],{"class":732},[585,810,736],{"class":670},[585,812,814,817,819,822,825,828,830,833,836,838,840],{"class":655,"line":813},8,[585,815,816],{"class":666},"    for",[585,818,801],{"class":751},[585,820,821],{"class":732},"const",[585,823,824],{"class":674}," enricher",[585,826,827],{"class":670}," of",[585,829,745],{"class":674},[585,831,832],{"class":751},") ",[585,834,835],{"class":716},"enricher",[585,837,720],{"class":751},[585,839,804],{"class":674},[585,841,842],{"class":751},")\n",[585,844,846,849],{"class":655,"line":845},9,[585,847,848],{"class":670},"  }",[585,850,842],{"class":751},[585,852,854,857],{"class":655,"line":853},10,[585,855,856],{"class":670},"}",[585,858,842],{"class":674},[633,860,862],{"className":647,"code":861,"filename":216,"language":650,"meta":641,"style":641},"\u002F\u002F lib\u002Fevlog.ts\nimport { createEvlog } from 'evlog\u002Fnext'\nimport { createUserAgentEnricher, createGeoEnricher } from 'evlog\u002Fenrichers'\n\nconst enrichers = [createUserAgentEnricher(), createGeoEnricher()]\n\nexport const { withEvlog, useLogger, log, createError } = createEvlog({\n  service: 'my-app',\n  enrich: (ctx) => {\n    for (const enricher of enrichers) enricher(ctx)\n  },\n})\n",[624,863,864,869,889,911,915,937,941,979,997,1014,1038,1044],{"__ignoreMap":641},[585,865,866],{"class":655,"line":656},[585,867,868],{"class":659},"\u002F\u002F lib\u002Fevlog.ts\n",[585,870,871,873,875,878,880,882,884,887],{"class":655,"line":663},[585,872,667],{"class":666},[585,874,671],{"class":670},[585,876,877],{"class":674}," createEvlog",[585,879,684],{"class":670},[585,881,687],{"class":666},[585,883,690],{"class":670},[585,885,886],{"class":693},"evlog\u002Fnext",[585,888,697],{"class":670},[585,890,891,893,895,897,899,901,903,905,907,909],{"class":655,"line":700},[585,892,667],{"class":666},[585,894,671],{"class":670},[585,896,675],{"class":674},[585,898,678],{"class":670},[585,900,681],{"class":674},[585,902,684],{"class":670},[585,904,687],{"class":666},[585,906,690],{"class":670},[585,908,694],{"class":693},[585,910,697],{"class":670},[585,912,913],{"class":655,"line":707},[585,914,704],{"emptyLinePlaceholder":703},[585,916,917,919,922,925,927,929,931,933,935],{"class":655,"line":739},[585,918,821],{"class":732},[585,920,921],{"class":674}," enrichers ",[585,923,924],{"class":670},"=",[585,926,752],{"class":674},[585,928,755],{"class":716},[585,930,758],{"class":674},[585,932,678],{"class":670},[585,934,681],{"class":716},[585,936,765],{"class":674},[585,938,939],{"class":655,"line":768},[585,940,704],{"emptyLinePlaceholder":703},[585,942,943,945,948,950,953,955,958,960,963,965,968,970,972,974,976],{"class":655,"line":773},[585,944,710],{"class":666},[585,946,947],{"class":732}," const",[585,949,671],{"class":670},[585,951,952],{"class":674}," withEvlog",[585,954,678],{"class":670},[585,956,957],{"class":674}," useLogger",[585,959,678],{"class":670},[585,961,962],{"class":674}," log",[585,964,678],{"class":670},[585,966,967],{"class":674}," createError ",[585,969,856],{"class":670},[585,971,748],{"class":670},[585,973,877],{"class":716},[585,975,720],{"class":674},[585,977,978],{"class":670},"{\n",[585,980,981,984,987,989,992,994],{"class":655,"line":813},[585,982,983],{"class":751},"  service",[585,985,986],{"class":670},":",[585,988,690],{"class":670},[585,990,991],{"class":693},"my-app",[585,993,792],{"class":670},[585,995,996],{"class":670},",\n",[585,998,999,1002,1004,1006,1008,1010,1012],{"class":655,"line":845},[585,1000,1001],{"class":716},"  enrich",[585,1003,986],{"class":670},[585,1005,801],{"class":670},[585,1007,804],{"class":725},[585,1009,729],{"class":670},[585,1011,733],{"class":732},[585,1013,736],{"class":670},[585,1015,1016,1018,1020,1022,1024,1026,1028,1030,1032,1034,1036],{"class":655,"line":853},[585,1017,816],{"class":666},[585,1019,801],{"class":751},[585,1021,821],{"class":732},[585,1023,824],{"class":674},[585,1025,827],{"class":670},[585,1027,745],{"class":674},[585,1029,832],{"class":751},[585,1031,835],{"class":716},[585,1033,720],{"class":751},[585,1035,804],{"class":674},[585,1037,842],{"class":751},[585,1039,1041],{"class":655,"line":1040},11,[585,1042,1043],{"class":670},"  },\n",[585,1045,1047,1049],{"class":655,"line":1046},12,[585,1048,856],{"class":670},[585,1050,842],{"class":674},[633,1052,1055],{"className":647,"code":1053,"filename":1054,"language":650,"meta":641,"style":641},"\u002F\u002F Pass `enrichers` to the framework's evlog middleware\u002Fmodule\nimport { createUserAgentEnricher, createGeoEnricher } from 'evlog\u002Fenrichers'\n\nconst enrichers = [createUserAgentEnricher(), createGeoEnricher()]\n\napp.use(evlog({ enrichers })) \u002F\u002F Hono \u002F Express \u002F Elysia\n\u002F\u002F await app.register(evlog, { enrichers }) \u002F\u002F Fastify\n\u002F\u002F EvlogModule.forRoot({ enrichers }) \u002F\u002F NestJS\n","Hono \u002F Express \u002F Fastify \u002F Elysia \u002F NestJS",[624,1056,1057,1062,1084,1088,1108,1112,1142,1150],{"__ignoreMap":641},[585,1058,1059],{"class":655,"line":656},[585,1060,1061],{"class":659},"\u002F\u002F Pass `enrichers` to the framework's evlog middleware\u002Fmodule\n",[585,1063,1064,1066,1068,1070,1072,1074,1076,1078,1080,1082],{"class":655,"line":663},[585,1065,667],{"class":666},[585,1067,671],{"class":670},[585,1069,675],{"class":674},[585,1071,678],{"class":670},[585,1073,681],{"class":674},[585,1075,684],{"class":670},[585,1077,687],{"class":666},[585,1079,690],{"class":670},[585,1081,694],{"class":693},[585,1083,697],{"class":670},[585,1085,1086],{"class":655,"line":700},[585,1087,704],{"emptyLinePlaceholder":703},[585,1089,1090,1092,1094,1096,1098,1100,1102,1104,1106],{"class":655,"line":707},[585,1091,821],{"class":732},[585,1093,921],{"class":674},[585,1095,924],{"class":670},[585,1097,752],{"class":674},[585,1099,755],{"class":716},[585,1101,758],{"class":674},[585,1103,678],{"class":670},[585,1105,681],{"class":716},[585,1107,765],{"class":674},[585,1109,1110],{"class":655,"line":739},[585,1111,704],{"emptyLinePlaceholder":703},[585,1113,1114,1117,1119,1122,1124,1127,1129,1132,1134,1136,1139],{"class":655,"line":768},[585,1115,1116],{"class":674},"app",[585,1118,779],{"class":670},[585,1120,1121],{"class":716},"use",[585,1123,720],{"class":674},[585,1125,1126],{"class":716},"evlog",[585,1128,720],{"class":674},[585,1130,1131],{"class":670},"{",[585,1133,921],{"class":674},[585,1135,856],{"class":670},[585,1137,1138],{"class":674},")) ",[585,1140,1141],{"class":659},"\u002F\u002F Hono \u002F Express \u002F Elysia\n",[585,1143,1144,1147],{"class":655,"line":773},[585,1145,1146],{"class":659},"\u002F\u002F await app.register(evlog, { enrichers })",[585,1148,1149],{"class":659}," \u002F\u002F Fastify\n",[585,1151,1152,1155],{"class":655,"line":813},[585,1153,1154],{"class":659},"\u002F\u002F EvlogModule.forRoot({ enrichers })",[585,1156,1157],{"class":659}," \u002F\u002F NestJS\n",[633,1159,1161],{"className":647,"code":1160,"filename":271,"language":650,"meta":641,"style":641},"\u002F\u002F index.ts\nimport { initLogger } from 'evlog'\nimport { createUserAgentEnricher, createGeoEnricher } from 'evlog\u002Fenrichers'\n\ninitLogger({\n  enrichers: [createUserAgentEnricher(), createGeoEnricher()],\n})\n",[624,1162,1163,1168,1187,1209,1213,1222,1244],{"__ignoreMap":641},[585,1164,1165],{"class":655,"line":656},[585,1166,1167],{"class":659},"\u002F\u002F index.ts\n",[585,1169,1170,1172,1174,1177,1179,1181,1183,1185],{"class":655,"line":663},[585,1171,667],{"class":666},[585,1173,671],{"class":670},[585,1175,1176],{"class":674}," initLogger",[585,1178,684],{"class":670},[585,1180,687],{"class":666},[585,1182,690],{"class":670},[585,1184,1126],{"class":693},[585,1186,697],{"class":670},[585,1188,1189,1191,1193,1195,1197,1199,1201,1203,1205,1207],{"class":655,"line":700},[585,1190,667],{"class":666},[585,1192,671],{"class":670},[585,1194,675],{"class":674},[585,1196,678],{"class":670},[585,1198,681],{"class":674},[585,1200,684],{"class":670},[585,1202,687],{"class":666},[585,1204,690],{"class":670},[585,1206,694],{"class":693},[585,1208,697],{"class":670},[585,1210,1211],{"class":655,"line":707},[585,1212,704],{"emptyLinePlaceholder":703},[585,1214,1215,1218,1220],{"class":655,"line":739},[585,1216,1217],{"class":716},"initLogger",[585,1219,720],{"class":674},[585,1221,978],{"class":670},[585,1223,1224,1227,1229,1231,1233,1235,1237,1239,1242],{"class":655,"line":768},[585,1225,1226],{"class":751},"  enrichers",[585,1228,986],{"class":670},[585,1230,752],{"class":674},[585,1232,755],{"class":716},[585,1234,758],{"class":674},[585,1236,678],{"class":670},[585,1238,681],{"class":716},[585,1240,1241],{"class":674},"()]",[585,1243,996],{"class":670},[585,1245,1246,1248],{"class":655,"line":773},[585,1247,856],{"class":670},[585,1249,842],{"class":674},[616,1251,1253],{"id":1252},"enrich-context","Enrich Context",[554,1255,1256,1257,1260],{},"Every enricher receives an ",[624,1258,1259],{},"EnrichContext"," with:",[1262,1263,1264,1280],"table",{},[1265,1266,1267],"thead",{},[1268,1269,1270,1274,1277],"tr",{},[1271,1272,1273],"th",{},"Field",[1271,1275,1276],{},"Type",[1271,1278,1279],{},"Description",[1281,1282,1283,1299,1324,1338],"tbody",{},[1268,1284,1285,1291,1296],{},[1286,1287,1288],"td",{},[624,1289,1290],{},"event",[1286,1292,1293],{},[624,1294,1295],{},"WideEvent",[1286,1297,1298],{},"The emitted wide event (mutable)",[1268,1300,1301,1306,1311],{},[1286,1302,1303],{},[624,1304,1305],{},"request",[1286,1307,1308],{},[624,1309,1310],{},"object",[1286,1312,1313,1314,1317,1318,1317,1321,729],{},"Request metadata (",[624,1315,1316],{},"method",", ",[624,1319,1320],{},"path",[624,1322,1323],{},"requestId",[1268,1325,1326,1331,1335],{},[1286,1327,1328],{},[624,1329,1330],{},"headers",[1286,1332,1333],{},[624,1334,1310],{},[1286,1336,1337],{},"Safe HTTP request headers (sensitive headers are filtered)",[1268,1339,1340,1345,1349],{},[1286,1341,1342],{},[624,1343,1344],{},"response",[1286,1346,1347],{},[624,1348,1310],{},[1286,1350,1351,1352,1317,1355,729],{},"Response metadata (",[624,1353,1354],{},"status",[624,1356,1330],{},[1358,1359,1361,1365,1366,1317,1369,1317,1372,1375],"callout",{"color":1360,"icon":129},"success",[1362,1363,1364],"strong",{},"Security:"," Sensitive headers (",[624,1367,1368],{},"authorization",[624,1370,1371],{},"cookie",[624,1373,1374],{},"x-api-key",", etc.) are automatically filtered and never passed to enrichers.",[616,1377,1379],{"id":1378},"available-enrichers","Available Enrichers",[1381,1382,1383,1390,1396,1401,1407],"card-group",{},[1384,1385,1389],"card",{"icon":1386,"title":1387,"to":1388},"i-lucide-monitor-smartphone","User Agent","\u002Fenrichers\u002Fbuilt-in#user-agent","Parse browser, OS, and device type from the User-Agent header.",[1384,1391,1395],{"icon":1392,"title":1393,"to":1394},"i-lucide-map-pin","Geo","\u002Fenrichers\u002Fbuilt-in#geo","Extract country, region, city, and coordinates from platform headers.",[1384,1397,1400],{"icon":503,"title":1398,"to":1399},"Request Size","\u002Fenrichers\u002Fbuilt-in#request-size","Capture request and response payload sizes from Content-Length headers.",[1384,1402,1406],{"icon":1403,"title":1404,"to":1405},"i-lucide-route","Trace Context","\u002Fenrichers\u002Fbuilt-in#trace-context","Extract W3C trace context (traceId, spanId) from the traceparent header.",[1384,1408,1409],{"icon":83,"title":544,"to":545},"Write your own enricher for any derived context.",[616,1411,1413],{"id":1412},"overwrite-behavior","Overwrite Behavior",[554,1415,1416,1417,1420,1421,1424],{},"By default, enrichers preserve existing fields. If your application code already sets ",[624,1418,1419],{},"event.userAgent",", the enricher won't overwrite it. 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