hook-log
Example Code
typescript
// ## Available context properties inside each hook
import { Elysia, t } from "elysia";
const logContext = (name: string, context: any) => {
console.log(
`[${name}]`.padEnd(17),
`{ ${Object.keys(context).sort().join(", ")} }`
);
};
export default new Elysia()
.onRequest((context) => logContext("onRequest", context))
.onParse((context) => logContext("onParse", context))
.onTransform((context) => logContext("onTransform", context))
.onBeforeHandle((context) => logContext("onBeforeHandle", context))
.onAfterHandle((context) => logContext("onAfterHandle", context))
.mapResponse((context) => logContext("mapResponse", context))
.onAfterResponse((context) => logContext("onAfterResponse", context))
.onError((context) => logContext("onError", context))
.post(
"/",
async (context) => {
logContext("handler", context);
if (context.query["crash"]) throw new Error("crash");
return { ok: true };
},
{
query: t.Object({
crash: t.Optional(t.String()),
validate: t.Optional(t.Literal("pass")),
}),
}
);Tests
| Test | bun | node |
|---|---|---|
| 200 | 🏃 | 🏃 |
| 422 | 🏃 | 🏃 |
| 500 | 🏃 | 🏃 |
200
text
=== Test Execution ===
$ curl -s -D- http://localhost:3000 -X POST -d x=1
HTTP/1.1 200 OK
Content-Type: application/json
Date: Sun, 01 Jun 2025 11:22:35 GMT
Content-Length: 11
{"ok":true}
=== Runtime Output ===
[runtime] Bun 1.2.15
Started development server: http://localhost:3000
[onRequest] { error, path, qi, redirect, request, server, set, status, store, url }
[onParse] { contentType, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onTransform] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onBeforeHandle] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[handler] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onAfterHandle] { body, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[mapResponse] { body, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onAfterResponse] { body, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }text
=== Test Execution ===
$ curl -s -D- http://localhost:3000 -X POST -d x=1
HTTP/1.1 200 OK
content-type: application/json
Content-Length: 11
Date: Sun, 01 Jun 2025 11:22:36 GMT
Connection: keep-alive
Keep-Alive: timeout=5
{"ok":true}
=== Runtime Output ===
(node:28) ExperimentalWarning: Type Stripping is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
[runtime] Node v22.16.0
🦊 Elysia is running at :::3000
[onRequest] { error, path, qi, redirect, request, server, set, status, store, url }
[onParse] { contentType, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onTransform] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onBeforeHandle] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[handler] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onAfterHandle] { body, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[mapResponse] { body, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onAfterResponse] { body, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }422
text
=== Test Execution ===
$ curl -s -D- "http://localhost:3000?validate=fail" -X POST -d x=1
HTTP/1.1 422 Unprocessable Entity
Content-Type: application/json
Date: Sun, 01 Jun 2025 11:22:36 GMT
Content-Length: 460
{
"type": "validation",
"on": "query",
"summary": "Expected 'pass'",
"property": "/validate",
"message": "Expected 'pass'",
"expected": {},
"found": {
"validate": "fail"
},
"errors": [
{
"summary": "Expected 'pass'",
"type": 32,
"schema": {
"const": "pass",
"type": "string"
},
"path": "/validate",
"value": "fail",
"message": "Expected 'pass'",
"errors": []
}
]
}
=== Runtime Output ===
[runtime] Bun 1.2.15
Started development server: http://localhost:3000
[onRequest] { error, path, qi, redirect, request, server, set, status, store, url }
[onParse] { contentType, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onTransform] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onError] { body, code, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[mapResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onAfterResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }text
=== Test Execution ===
$ curl -s -D- "http://localhost:3000?validate=fail" -X POST -d x=1
HTTP/1.1 400 Bad Request
content-type: application/json
Content-Length: 460
Date: Sun, 01 Jun 2025 11:22:37 GMT
Connection: keep-alive
Keep-Alive: timeout=5
{
"type": "validation",
"on": "query",
"summary": "Expected 'pass'",
"property": "/validate",
"message": "Expected 'pass'",
"expected": {},
"found": {
"validate": "fail"
},
"errors": [
{
"summary": "Expected 'pass'",
"type": 32,
"schema": {
"const": "pass",
"type": "string"
},
"path": "/validate",
"value": "fail",
"message": "Expected 'pass'",
"errors": []
}
]
}
=== Runtime Output ===
(node:27) ExperimentalWarning: Type Stripping is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
[runtime] Node v22.16.0
🦊 Elysia is running at :::3000
[onRequest] { error, path, qi, redirect, request, server, set, status, store, url }
[onParse] { contentType, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onTransform] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onError] { body, code, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[mapResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onError] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[mapResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onAfterResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }500
text
=== Test Execution ===
$ curl -s -D- "http://localhost:3000?crash=1" -X POST -d x=1
HTTP/1.1 500 Internal Server Error
content-type: text/plain;charset=utf-8
Date: Sun, 01 Jun 2025 11:22:36 GMT
Content-Length: 5
crash
=== Runtime Output ===
[runtime] Bun 1.2.15
Started development server: http://localhost:3000
[onRequest] { error, path, qi, redirect, request, server, set, status, store, url }
[onParse] { contentType, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onTransform] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onBeforeHandle] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[handler] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onError] { body, code, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[mapResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onAfterResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }text
=== Test Execution ===
$ curl -s -D- "http://localhost:3000?crash=1" -X POST -d x=1
HTTP/1.1 500 Internal Server Error
Content-Length: 5
Date: Sun, 01 Jun 2025 11:22:38 GMT
Connection: keep-alive
Keep-Alive: timeout=5
crash
=== Runtime Output ===
(node:26) ExperimentalWarning: Type Stripping is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
[runtime] Node v22.16.0
🦊 Elysia is running at :::3000
[onRequest] { error, path, qi, redirect, request, server, set, status, store, url }
[onParse] { contentType, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onTransform] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onBeforeHandle] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[handler] { body, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[onError] { body, code, cookie, error, headers, path, qi, query, redirect, request, route, server, set, status, store, url }
[mapResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onError] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[mapResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }
[onAfterResponse] { body, code, cookie, error, headers, path, qi, query, redirect, request, response, route, server, set, status, store, url }