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node_modules/pino/docs/redaction.md

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+# Redaction
+
+> Redaction is not supported in the browser [#670](https://github.com/pinojs/pino/issues/670)
+
+To redact sensitive information, supply paths to keys that hold sensitive data
+using the `redact` option:
+
+```js
+const logger = require('.')({
+  redact: ['key', 'path.to.key', 'stuff.thats[*].secret']
+})
+
+logger.info({
+  key: 'will be redacted',
+  path: {
+    to: {key: 'sensitive', another: 'thing'}
+  },
+  stuff: {
+    thats: [
+      {secret: 'will be redacted', logme: 'will be logged'},
+      {secret: 'as will this', logme: 'as will this'}
+    ]
+  }
+})
+```
+
+This will output:
+
+```JSON
+{"level":30,"time":1527777350011,"pid":3186,"hostname":"Davids-MacBook-Pro-3.local","key":"[Redacted]","path":{"to":{"key":"[Redacted]","another":"thing"}},"stuff":{"thats":[{"secret":"[Redacted]","logme":"will be logged"},{"secret":"[Redacted]","logme":"as will this"}]},"v":1}
+```
+
+The `redact` option can take an array (as shown in the above example) or
+an object. This allows control over *how* information is redacted.
+
+For instance, setting the censor:
+
+```js
+const logger = require('.')({
+  redact: {
+    paths: ['key', 'path.to.key', 'stuff.thats[*].secret'],
+    censor: '**GDPR COMPLIANT**'
+  }
+})
+
+logger.info({
+  key: 'will be redacted',
+  path: {
+    to: {key: 'sensitive', another: 'thing'}
+  },
+  stuff: {
+    thats: [
+      {secret: 'will be redacted', logme: 'will be logged'},
+      {secret: 'as will this', logme: 'as will this'}
+    ]
+  }
+})
+```
+
+This will output:
+
+```JSON
+{"level":30,"time":1527778563934,"pid":3847,"hostname":"Davids-MacBook-Pro-3.local","key":"**GDPR COMPLIANT**","path":{"to":{"key":"**GDPR COMPLIANT**","another":"thing"}},"stuff":{"thats":[{"secret":"**GDPR COMPLIANT**","logme":"will be logged"},{"secret":"**GDPR COMPLIANT**","logme":"as will this"}]},"v":1}
+```
+
+The `redact.remove` option also allows for the key and value to be removed from output:
+
+```js
+const logger = require('.')({
+  redact: {
+    paths: ['key', 'path.to.key', 'stuff.thats[*].secret'],
+    remove: true
+  }
+})
+
+logger.info({
+  key: 'will be redacted',
+  path: {
+    to: {key: 'sensitive', another: 'thing'}
+  },
+  stuff: {
+    thats: [
+      {secret: 'will be redacted', logme: 'will be logged'},
+      {secret: 'as will this', logme: 'as will this'}
+    ]
+  }
+})
+```
+
+This will output
+
+```JSON
+{"level":30,"time":1527782356751,"pid":5758,"hostname":"Davids-MacBook-Pro-3.local","path":{"to":{"another":"thing"}},"stuff":{"thats":[{"logme":"will be logged"},{"logme":"as will this"}]},"v":1}
+```
+
+See [pino options in API](/docs/api.md#redact-array-object) for `redact` API details.
+
+<a name="paths"></a>
+## Path Syntax
+
+The syntax for paths supplied to the `redact` option conform to the syntax in path lookups
+in standard EcmaScript, with two additions:
+
+* paths may start with bracket notation
+* paths may contain the asterisk `*` to denote a wildcard
+
+By way of example, the following are all valid paths:
+
+* `a.b.c`
+* `a["b-c"].d`
+* `["a-b"].c`
+* `a.b.*`
+* `a[*].b`
+
+## Overhead
+
+Pino's redaction functionality is built on top of [`fast-redact`](http://github.com/davidmarkclements/fast-redact)
+which adds about 2% overhead to `JSON.stringify` when using paths without wildcards.
+
+When used with pino logger with a single redacted path, any overhead is within noise -
+a way to deterministically measure it's effect has not been found. This is because its not a bottleneck.
+
+However, wildcard redaction does carry a non-trivial cost relative to explicitly declaring the keys
+(50% in a case where four keys are redacted across two objects). See
+the [`fast-redact` benchmarks](https://github.com/davidmarkclements/fast-redact#benchmarks) for details.
+
+## Safety
+
+The `redact` option is intended as an initialization time configuration option.
+It's extremely important that path strings do not originate from user input.
+The `fast-redact` module uses a VM context to syntax check the paths, user input
+should never be combined with such an approach. See the [`fast-redact` Caveat](https://github.com/davidmarkclements/fast-redact#caveat)
+and the [`fast-redact` Approach](https://github.com/davidmarkclements/fast-redact#approach) for in-depth information.