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@@ -2,17 +2,18 @@
## Logging
### Enable logging
Logging is disabled by default, and you can enable it by passing `{ logger: true
}` or `{ logger: { level: 'info' } }` when you create a Fastify instance. Note
that if the logger is disabled, it is impossible to enable it at runtime. We use
[abstract-logging](https://www.npmjs.com/package/abstract-logging) for this
purpose.
### Enable Logging
Logging is disabled by default. Enable it by passing `{ logger: true }` or
`{ logger: { level: 'info' } }` when creating a Fastify instance. Note that if
the logger is disabled, it cannot be enabled at runtime.
[abstract-logging](https://www.npmjs.com/package/abstract-logging) is used for
this purpose.
As Fastify is focused on performance, it uses
[pino](https://github.com/pinojs/pino) as its logger, with the default log
level, when enabled, set to `'info'`.
level set to `'info'` when enabled.
#### Basic logging setup
Enabling the production JSON logger:
```js
@@ -21,8 +22,9 @@ const fastify = require('fastify')({
})
```
Enabling the logger with appropriate configuration for both local development
and production and test environment requires a bit more configuration:
#### Environment-Specific Configuration
Enabling the logger with appropriate configuration for local development,
production, and test environments requires more configuration:
```js
const envToLogger = {
@@ -42,11 +44,11 @@ const fastify = require('fastify')({
logger: envToLogger[environment] ?? true // defaults to true if no entry matches in the map
})
```
⚠️ `pino-pretty` needs to be installed as a dev dependency, it is not included
⚠️ `pino-pretty` needs to be installed as a dev dependency. It is not included
by default for performance reasons.
### Usage
You can use the logger like this in your route handlers:
The logger can be used in route handlers as follows:
```js
fastify.get('/', options, function (request, reply) {
@@ -55,16 +57,16 @@ fastify.get('/', options, function (request, reply) {
})
```
You can trigger new logs outside route handlers by using the Pino instance from
the Fastify instance:
Trigger new logs outside route handlers using the Pino instance from the Fastify
instance:
```js
fastify.log.info('Something important happened!');
```
If you want to pass some options to the logger, just pass them to Fastify.
You can find all available options in the
[Pino documentation](https://github.com/pinojs/pino/blob/master/docs/api.md#options).
If you want to specify a file destination, use:
#### Passing Logger Options
To pass options to the logger, provide them to Fastify. See the
[Pino documentation](https://github.com/pinojs/pino/blob/master/docs/api.md#options)
for available options. To specify a file destination, use:
```js
const fastify = require('fastify')({
@@ -80,8 +82,8 @@ fastify.get('/', options, function (request, reply) {
})
```
If you want to pass a custom stream to the Pino instance, just add a stream
field to the logger object.
To pass a custom stream to the Pino instance, add a `stream` field to the logger
object:
```js
const split = require('split2')
@@ -95,19 +97,25 @@ const fastify = require('fastify')({
})
```
<a id="logging-request-id"></a>
### Advanced Logger Configuration
<a id="logging-request-id"></a>
#### Request ID Tracking
By default, Fastify adds an ID to every request for easier tracking. If the
"request-id" header is present its value is used, otherwise a new incremental ID
is generated. See Fastify Factory
`requestIdHeader` option is set and the corresponding header is present, its
value is used; otherwise, a new incremental ID is generated. See Fastify Factory
[`requestIdHeader`](./Server.md#factory-request-id-header) and Fastify Factory
[`genReqId`](./Server.md#genreqid) for customization options.
The default logger is configured with a set of standard serializers that
serialize objects with `req`, `res`, and `err` properties. The object received
by `req` is the Fastify [`Request`](./Request.md) object, while the object
received by `res` is the Fastify [`Reply`](./Reply.md) object. This behavior
can be customized by specifying custom serializers.
> ⚠ Warning: enabling `requestIdHeader` allows any callers to set `reqId` to a
> value of their choosing.
> No validation is performed on `requestIdHeader`.
#### Serializers
The default logger uses standard serializers for objects with `req`, `res`, and
`err` properties. The `req` object is the Fastify [`Request`](./Request.md)
object, and the `res` object is the Fastify [`Reply`](./Reply.md) object. This
behavior can be customized with custom serializers.
```js
const fastify = require('fastify')({
@@ -121,7 +129,7 @@ const fastify = require('fastify')({
})
```
For example, the response payload and headers could be logged using the approach
below (even if it is *not recommended*):
below (not recommended):
```js
const fastify = require('fastify')({
@@ -140,12 +148,11 @@ const fastify = require('fastify')({
return {
method: request.method,
url: request.url,
path: request.routerPath,
path: request.routeOptions.url,
parameters: request.params,
// Including the headers in the log could be in violation
// of privacy laws, e.g. GDPR. You should use the "redact" option to
// remove sensitive fields. It could also leak authentication data in
// the logs.
// Including headers in the log could violate privacy laws,
// e.g., GDPR. Use the "redact" option to remove sensitive
// fields. It could also leak authentication data in the logs.
headers: request.headers
};
}
@@ -154,11 +161,11 @@ const fastify = require('fastify')({
});
```
**Note**: In certain cases, the [`Reply`](./Reply.md) object passed to the `res`
serializer cannot be fully constructed. When writing a custom `res` serializer,
it is necessary to check for the existence of any properties on `reply` aside
from `statusCode`, which is always present. For example, the existence of
`getHeaders` must be verified before it can be called:
> Note: In some cases, the [`Reply`](./Reply.md) object passed to the `res`
> serializer cannot be fully constructed. When writing a custom `res`
> serializer, check for the existence of any properties on `reply` aside from
> `statusCode`, which is always present. For example, verify the existence of
> `getHeaders` before calling it:
```js
const fastify = require('fastify')({
@@ -170,7 +177,7 @@ const fastify = require('fastify')({
res (reply) {
// The default
return {
statusCode: reply.statusCode
statusCode: reply.statusCode,
headers: typeof reply.getHeaders === 'function'
? reply.getHeaders()
: {}
@@ -181,11 +188,11 @@ const fastify = require('fastify')({
});
```
**Note**: The body cannot be serialized inside a `req` method because the
request is serialized when we create the child logger. At that time, the body is
not yet parsed.
> Note: The body cannot be serialized inside a `req` method because the
request is serialized when the child logger is created. At that time, the body
is not yet parsed.
See an approach to log `req.body`
See the following approach to log `req.body`:
```js
app.addHook('preHandler', function (req, reply, done) {
@@ -196,23 +203,24 @@ app.addHook('preHandler', function (req, reply, done) {
})
```
**Note**: Care should be taken to ensure serializers never throw, as an error
thrown from a serializer has the potential to cause the Node process to exit.
See the [Pino documentation](https://getpino.io/#/docs/api?id=opt-serializers)
on serializers for more information.
> Note: Ensure serializers never throw errors, as this can cause the Node
> process to exit. See the
> [Pino documentation](https://getpino.io/#/docs/api?id=opt-serializers) for more
> information.
*Any logger other than Pino will ignore this option.*
You can also supply your own logger instance. Instead of passing configuration
options, pass the instance. The logger you supply must conform to the Pino
interface; that is, it must have the following methods: `info`, `error`,
`debug`, `fatal`, `warn`, `trace`, `silent`, `child` and a string property `level`.
### Using Custom Loggers
A custom logger instance can be supplied by passing it as `loggerInstance`. The
logger must conform to the Pino interface, with methods: `info`, `error`,
`debug`, `fatal`, `warn`, `trace`, `silent`, `child`, and a string property
`level`.
Example:
```js
const log = require('pino')({ level: 'info' })
const fastify = require('fastify')({ logger: log })
const fastify = require('fastify')({ loggerInstance: log })
log.info('does not have request information')
@@ -225,11 +233,11 @@ fastify.get('/', function (request, reply) {
*The logger instance for the current request is available in every part of the
[lifecycle](./Lifecycle.md).*
## Log Redaction
### Log Redaction
[Pino](https://getpino.io) supports low-overhead log redaction for obscuring
values of specific properties in recorded logs. As an example, we might want to
log all the HTTP headers minus the `Authorization` header for security concerns:
values of specific properties in recorded logs. For example, log all HTTP
headers except the `Authorization` header for security:
```js
const fastify = Fastify({
@@ -243,7 +251,7 @@ const fastify = Fastify({
method: request.method,
url: request.url,
headers: request.headers,
hostname: request.hostname,
host: request.host,
remoteAddress: request.ip,
remotePort: request.socket.remotePort
}