npm package: @mahmoodels/express-winston
Description: express.js middleware for winstonjs/winston
Author: bithavoc
Latest version: 4.2.1

# express-winston
[![Monthly Downloads](https://img.shields.io/npm/dm/express-winston.svg)](https://www.npmjs.com/package/express-winston) [![Build Status](https://secure.travis-ci.org/bithavoc/express-winston.png)](http://travis-ci.org/bithavoc/express-winston)

> [winston](https://github.com/winstonjs/winston) middleware for express.js

[Changelog](CHANGELOG.md)

[CALL FOR MAINTAINERS](https://github.com/bithavoc/express-winston/issues/192)


## IMPORTANT UPDATES TO THIS PACAKGE

the us of below code is now valid in the routes

```
req._routeBlacklists.res=['body']
```

you can use this to ignore logging of response body in some specific routes due to a binary response or anything els.

## Installation

    npm install winston express-winston

(supports node >= 6)

## #BLM and 5.x breaking changes

The maintainers of this project no longer feel comfortable with the following terms:
* whitelist
* blacklist
* master

Therefore, exposed configuration options, types in this library using those terms are due to be removed in the upcoming 5.x series,
including the ~~master~~ branch, you should update your apps and your code accordingly.
We've taken immediate action to make `main` our default branch in Git.

You can track the progress of these changes in [#247](https://github.com/bithavoc/express-winston/issues/247).

## Usage

express-winston provides middlewares for request and error logging of your express.js application.  It uses 'whitelists' to select properties from the request and (new in 0.2.x) response objects.

To make use of express-winston, you need to add the following to your application:

In `package.json`:

```
{
  "dependencies": {
    "...": "...",
    "winston": "^3.0.0",
    "express-winston": "^4.0.4",
    "...": "..."
  }
}
```

In `server.js` (or wherever you need it):

```
var winston = require('winston'),
    expressWinston = require('express-winston');
```

### Request Logging

Use `expressWinston.logger(options)` to create a middleware to log your HTTP requests.

``` js
    var router = require('./my-express-router');

    app.use(expressWinston.logger({
      transports: [
        new winston.transports.Console()
      ],
      format: winston.format.combine(
        winston.format.colorize(),
        winston.format.json()
      ),
      meta: true, // optional: control whether you want to log the meta data about the request (default to true)
      msg: "HTTP {{req.method}} {{req.url}}", // optional: customize the default logging message. E.g. "{{res.statusCode}} {{req.method}} {{res.responseTime}}ms {{req.url}}"
      expressFormat: true, // Use the default Express/morgan request formatting. Enabling this will override any msg if true. Will only output colors with colorize set to true
      colorize: false, // Color the text and status code, using the Express/morgan color palette (text: gray, status: default green, 3XX cyan, 4XX yellow, 5XX red).
      ignoreRoute: function (req, res) { return false; } // optional: allows to skip some log messages based on request and/or response
    }));

    app.use(router); // notice how the router goes after the logger.
```

#### Options

``` js
    transports: [<WinstonTransport>], // list of all winston transports instances to use.
    format: [<logform.Format>], // formatting desired for log output.
    winstonInstance: <WinstonLogger>, // a winston logger instance. If this is provided the transports and formats options are ignored.
    level: String or function(req, res) { return String; }, // log level to use, the default is "info". Assign a  function to dynamically set the level based on request and response, or a string to statically set it always at that level. statusLevels must be false for this setting to be used.
    msg: String or function, // customize the default logging message. E.g. "{{res.statusCode}} {{req.method}} {{res.responseTime}}ms {{req.url}}", "HTTP {{req.method}} {{req.url}}" or function(req, res) { return `${res.statusCode} - ${req.method}` }, // Warning: while supported, returning mustache style interpolation from an options.msg function has performance and memory implications under load.
    expressFormat: Boolean, // Use the default Express/morgan request formatting. Enabling this will override any msg if true. Will only output colors when colorize set to true
    colorize: Boolean, // Color the text and status code, using the Express/morgan color palette (text: gray, status: default green, 3XX cyan, 4XX yellow, 5XX red).
    meta: Boolean, // control whether you want to log the meta data about the request (default to true).
    baseMeta: Object, // default meta data to be added to log, this will be merged with the meta data.
    metaField: String, // if defined, the meta data will be added in this field instead of the meta root object. Defaults to 'meta'. Set to `null` to store metadata at the root of the log entry.
    requestField: [String] // the property of the metadata to store the request under (default 'req'). Set to null to exclude request from metadata
    statusLevels: Boolean or Object, // different HTTP status codes caused log messages to be logged at different levels (info/warn/error), the default is false. Use an object to control the levels various status codes are logged at. Using an object for statusLevels overrides any setting of options.level.
    ignoreRoute: function (req, res) { return false; }, // A function to determine if logging is skipped, defaults to returning false. Called _before_ any later middleware.
    skip: function(req, res) { return false; }, // A function to determine if logging is skipped, defaults to returning false. Called _after_ response has already been sent.
    requestFilter: function (req, propName) { return req[propName]; }, // A function to filter/return request values, defaults to returning all values allowed by whitelist. If the function returns undefined, the key/value will not be included in the meta.
    responseFilter: function (res, propName) { return res[propName]; }, // A function to filter/return response values, defaults to returning all values allowed by whitelist. If the function returns undefined, the key/value will not be included in the meta.
    requestWhitelist: [String], // Array of request properties to log. Overrides global requestWhitelist for this instance
    responseWhitelist: [String], // Array of response properties to log. Overrides global responseWhitelist for this instance
    bodyWhitelist: [String], // Array of body properties to log. Overrides global bodyWhitelist for this instance
    bodyBlacklist: [String], // Array of body properties to omit from logs. Overrides global bodyBlacklist for this instance
    ignoredRoutes: [String], // Array of paths to ignore/skip logging. Overrides global ignoredRoutes for this instance
    dynamicMeta: function(req, res) { return [Object]; } // Extract additional meta data from request or response (typically req.user data if using passport). meta must be true for this function to be activated
    headerBlacklist: [String], // Array of headers to omit from logs. Applied after any previous filters.

```

### Error Logging

Use `expressWinston.errorLogger(options)` to create a middleware that log the errors of the pipeline.

``` js
    var router = require('./my-express-router');

    app.use(router); // notice how the router goes first.
    app.use(expressWinston.errorLogger({
      transports: [
        new winston.transports.Console()
      ],
      format: winston.format.combine(
        winston.format.colorize(),
        winston.format.json()
      )
    }));
```

The logger needs to be added AFTER the express router (`app.router`) and BEFORE any of your custom error handlers (`express.handler`). Since express-winston will just log the errors and not __handle__ them, you can still use your custom error handler like `express.handler`, just be sure to put the logger before any of your handlers.

#### Options

``` js
    transports: [<WinstonTransport>], // list of all winston transports instances to use.
    format: [<logform.Format>], // formatting desired for log output
    winstonInstance: <WinstonLogger>, // a winston logger instance. If this is provided the transports and formats options are ignored.
    msg: String or function // customize the default logging message. E.g. "{{err.message}} {{res.statusCode}} {{req.method}}" or function(req, res) { return `${res.statusCode} - ${req.method}` }
    baseMeta: Object, // default meta data to be added to log, this will be merged with the error data.
    meta: Boolean, // control whether you want to log the meta data about the request (default to true).
    metaField: String, // if defined, the meta data will be added in this field instead of the meta root object. Defaults to 'meta'. Set to `null` to store metadata at the root of the log entry.
    requestField: [String] // the property of the metadata to store the request under (default 'req'). Set to null to exclude request from metadata    
    responseField: [String] // the property of the metadata to store the response under (default 'res'). If set to the same as 'requestField', filtered response and request properties will be merged. Set to null to exclude request from metadata
    requestFilter: function (req, propName) { return req[propName]; } // A function to filter/return request values, defaults to returning all values allowed by whitelist. If the function returns undefined, the key/value will not be included in the meta.
    requestWhitelist: [String] // Array of request properties to log. Overrides global requestWhitelist for this instance
    headerBlacklist: [String], // Array of headers to omit from logs. Applied after any previous filters.
    level: String or function(req, res, err) { return String; }// custom log level for errors (default is 'error'). Assign a function to dynamically set the log level based on request, response, and the exact error.
    dynamicMeta: function(req, res, err) { return [Object]; } // Extract additional meta data from request or response (typically req.user data if using passport). meta must be true for this function to be activated
    exceptionToMeta: function(error){return Object; } // Function to format the returned meta information on error log. If not given `winston.exception.getAllInfo` will be used by default
    blacklistedMetaFields: [String] // fields to blacklist from meta data
    skip: function(req, res, err) { return false; } // A function to determine if logging is skipped, defaults to returning false.
```

To use winston's existing transports, set `transports` to the values (as in key-value) of the `winston.default.transports` object. This may be done, for example, by using underscorejs: `transports: _.values(winston.default.transports)`.

Alternatively, if you're using a winston logger instance elsewhere and have already set up levels and transports, pass the instance into expressWinston with the `winstonInstance` option. The `transports` option is then ignored.

#### `metaField` option

In versions of `express-winston` prior to 4.0.0, this field functioned differently.  

Previously the log entry would always have a "meta" field which would be set to the metadata of the request/error.  
If `metaField` was set, this information would be stored as an object with the given property on the "meta" object of 
the log entry.  This prevented the use case where the metadata should be located at the root of the log entry.

In this version, `metaField` defaults to "meta" which maintains the prior versions behavior of storing the metadata at 
a "meta" property of the log entry.  

Explicitly setting the `metaField` to `null` or "null" causes the metadata to be stored at the root of the log entry.

The `metaField` option now also supports dot separated and array values to store the metadata at a nested location in the log entry.

<h3>Upgrade Note: For those upgrading from a version of `express-winston` prior to 4.0.0 that use the `metaField` property, to keep the same behavior, prepend `meta.` to your current `metaField` configuration. (i.e. 'foo' would become 'meta.foo')</h3> 

## Examples

``` js
    var express = require('express');
    var expressWinston = require('express-winston');
    var winston = require('winston'); // for transports.Console
    var app = module.exports = express();

    app.use(express.bodyParser());
    app.use(express.methodOverride());

    // Let's make our express `Router` first.
    var router = express.Router();
    router.get('/error', function(req, res, next) {
      // here we cause an error in the pipeline so we see express-winston in action.
      return next(new Error("This is an error and it should be logged to the console"));
    });

    router.get('/', function(req, res, next) {
      res.write('This is a normal request, it should be logged to the console too');
      res.end();
    });

    // express-winston logger makes sense BEFORE the router
    app.use(expressWinston.logger({
      transports: [
        new winston.transports.Console()
      ],
      format: winston.format.combine(
        winston.format.colorize(),
        winston.format.json()
      )
    }));

    // Now we can tell the app to use our routing code:
    app.use(router);

    // express-winston errorLogger makes sense AFTER the router.
    app.use(expressWinston.errorLogger({
      transports: [
        new winston.transports.Console()
      ],
      format: winston.format.combine(
        winston.format.colorize(),
        winston.format.json()
      )
    }));

    // Optionally you can include your custom error handler after the logging.
    app.use(express.errorLogger({
      dumpExceptions: true,
      showStack: true
    }));

    app.listen(3000, function(){
      console.log("express-winston demo listening on port %d in %s mode", this.address().port, app.settings.env);
    });
```

Browse `/` to see a regular HTTP logging like this:

    {
      "req": {
        "httpVersion": "1.1",
        "headers": {
          "host": "localhost:3000",
          "connection": "keep-alive",
          "accept": "*/*",
          "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
          "accept-encoding": "gzip,deflate,sdch",
          "accept-language": "en-US,en;q=0.8,es-419;q=0.6,es;q=0.4",
          "accept-charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.3",
          "cookie": "connect.sid=nGspCCSzH1qxwNTWYAoexI23.seE%2B6Whmcwd"
        },
        "url": "/",
        "method": "GET",
        "originalUrl": "/",
        "query": {}
      },
      "res": {
        "statusCode": 200
      },
      "responseTime" : 12,
      "level": "info",
      "message": "HTTP GET /favicon.ico"
    }

Browse `/error` will show you how express-winston handles and logs the errors in the express pipeline like this:

    {
      "date": "Thu Jul 19 2012 23:39:44 GMT-0500 (COT)",
      "process": {
        "pid": 35719,
        "uid": 501,
        "gid": 20,
        "cwd": "/Users/thepumpkin/Projects/testExpressWinston",
        "execPath": "/usr/local/bin/node",
        "version": "v0.6.18",
        "argv": [
          "node",
          "/Users/thepumpkin/Projects/testExpressWinston/app.js"
        ],
        "memoryUsage": {
          "rss": 14749696,
          "heapTotal": 7033664,
          "heapUsed": 5213280
        }
      },
      "os": {
        "loadavg": [
          1.95068359375,
          1.5166015625,
          1.38671875
        ],
        "uptime": 498086
      },
      "trace": [
        ...,
        {
          "column": 3,
          "file": "Object].log (/Users/thepumpkin/Projects/testExpressWinston/node_modules/winston/lib/winston/transports/console.js",
          "function": "[object",
          "line": 87,
          "method": null,
          "native": false
        }
      ],
      "stack": [
        "Error: This is an error and it should be logged to the console",
        "    at /Users/thepumpkin/Projects/testExpressWinston/app.js:39:15",
        "    at callbacks (/Users/thepumpkin/Projects/testExpressWinston/node_modules/express/lib/router/index.js:272:11)",
        "    at param (/Users/thepumpkin/Projects/testExpressWinston/node_modules/express/lib/router/index.js:246:11)",
        "    at pass (/Users/thepumpkin/Projects/testExpressWinston/node_modules/express/lib/router/index.js:253:5)",
        "    at Router._dispatch (/Users/thepumpkin/Projects/testExpressWinston/node_modules/express/lib/router/index.js:280:4)",
        "    at Object.handle (/Users/thepumpkin/Projects/testExpressWinston/node_modules/express/lib/router/index.js:45:10)",
        "    at next (/Users/thepumpkin/Projects/testExpressWinston/node_modules/express/node_modules/connect/lib/http.js:204:15)",
        "    at done (/Users/thepumpkin/Dropbox/Projects/express-winston/index.js:91:14)",
        "    at /Users/thepumpkin/Dropbox/Projects/express-winston/node_modules/async/lib/async.js:94:25",
        "    at [object Object].log (/Users/thepumpkin/Projects/testExpressWinston/node_modules/winston/lib/winston/transports/console.js:87:3)"
      ],
      "req": {
        "httpVersion": "1.1",
        "headers": {
          "host": "localhost:3000",
          "connection": "keep-alive",
          "cache-control": "max-age=0",
          "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
          "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
          "accept-encoding": "gzip,deflate,sdch",
          "accept-language": "en-US,en;q=0.8,es-419;q=0.6,es;q=0.4",
          "accept-charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.3",
          "cookie": "connect.sid=nGspCCSzH1qxwNTWYAoexI23.seE%2B6WhmcwdzFEjqhMDuIIl3mAUY7dT4vn%2BkWvRPhZc"
        },
        "url": "/error",
        "method": "GET",
        "originalUrl": "/error",
        "query": {}
      },
      "level": "error",
      "message": "middlewareError"
    }

### StackDriver/Google Cloud Logging

If using this library with `@google-cloud/logging-winston`, use the following configuration to properly store httpRequest information.

See https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry

```javascript
var express = require('express');
var expressWinston = require('express-winston');
var LoggingWinston = require('@google-cloud/logging-winston').LoggingWinston;

const app = express()

app.use(expressWinston.logger({
    transports: [new LoggingWinston({})],
    metaField: null, //this causes the metadata to be stored at the root of the log entry
    responseField: null, // this prevents the response from being included in the metadata (including body and status code)
    requestWhitelist: ['headers', 'query'],  //these are not included in the standard StackDriver httpRequest
    responseWhitelist: ['body'], // this populates the `res.body` so we can get the response size (not required)
    dynamicMeta:  (req, res) => {
      const httpRequest = {}
      const meta = {}
      if (req) {
        meta.httpRequest = httpRequest
        httpRequest.requestMethod = req.method
        httpRequest.requestUrl = `${req.protocol}://${req.get('host')}${req.originalUrl}`
        httpRequest.protocol = `HTTP/${req.httpVersion}`
        // httpRequest.remoteIp = req.ip // this includes both ipv6 and ipv4 addresses separated by ':'
        httpRequest.remoteIp = req.ip.indexOf(':') >= 0 ? req.ip.substring(req.ip.lastIndexOf(':') + 1) : req.ip   // just ipv4
        httpRequest.requestSize = req.socket.bytesRead
        httpRequest.userAgent = req.get('User-Agent')
        httpRequest.referrer = req.get('Referrer')
      }
    
      if (res) {
        meta.httpRequest = httpRequest
        httpRequest.status = res.statusCode
        httpRequest.latency = {
          seconds: Math.floor(res.responseTime / 1000),
          nanos: ( res.responseTime % 1000 ) * 1000000
        }
        if (res.body) {
          if (typeof res.body === 'object') {
            httpRequest.responseSize = JSON.stringify(res.body).length
          } else if (typeof res.body === 'string') {
            httpRequest.responseSize = res.body.length
          }
        }
      }
      return meta
    }
}));
```

## Global Whitelists and Blacklists

Express-winston exposes three whitelists that control which properties of the `request`, `body`, and `response` are logged:

* `requestWhitelist`
* `bodyWhitelist`, `bodyBlacklist`
* `responseWhitelist`

For example, `requestWhitelist` defaults to:

    ['url', 'headers', 'method', 'httpVersion', 'originalUrl', 'query'];

Only those properties of the request object will be logged. Set or modify the whitelist as necessary.

For example, to include the session property (the session data), add the following during logger setup:

    expressWinston.requestWhitelist.push('session');

The blacklisting excludes certain properties and keeps all others. If both `bodyWhitelist` and `bodyBlacklist` are set
the properties excluded by the blacklist are not included even if they are listed in the whitelist!

Example:

    expressWinston.bodyBlacklist.push('secretid', 'secretproperty');

Note that you can log the whole request and/or response body:

    expressWinston.requestWhitelist.push('body');
    expressWinston.responseWhitelist.push('body');
    
### Nested Whitelists

`requestWhitelist` and `responseWhitelist` also support nested whitelist values, allowing access to parts of an object.

For example, using the following during logger setup:

    expressWinston.responseWhitelist.push('body.important.value');
    
A response that looks like this :

    {
        body: {
            important: {
                value: 5
            },
            notImportant: {
                value: 7
            }
        },
        other: {
            value: 3
        }
    }
    
Would only log the following value :

    {
        body: {
            important: {
                value: 5
            }
        }
    }

## Route-Specific Whitelists and Blacklists

New in version 0.2.x is the ability to add whitelist elements in a route.  express-winston adds a `_routeWhitelists` object to the `req`uest, containing `.body`, `.req` and `.res` properties, to which you can set an array of 'whitelist' parameters to include in the log, specific to the route in question:

``` js
    router.post('/user/register', function(req, res, next) {
      req._routeWhitelists.body = ['username', 'email', 'age']; // But not 'password' or 'confirm-password' or 'top-secret'
      req._routeWhitelists.res = ['_headers'];
    });
```

Post to `/user/register` would give you something like the following:

    {
      "req": {
        "httpVersion": "1.1",
        "headers": {
          "host": "localhost:3000",
          "connection": "keep-alive",
          "accept": "*/*",
          "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
          "accept-encoding": "gzip,deflate,sdch",
          "accept-language": "en-US,en;q=0.8,es-419;q=0.6,es;q=0.4",
          "accept-charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.3",
          "cookie": "connect.sid=nGspCCSzH1qxwNTWYAoexI23.seE%2B6Whmcwd"
        },
        "url": "/",
        "method": "GET",
        "originalUrl": "/",
        "query": {},
        "body": {
          "username": "foo",
          "email": "foo@bar.com",
          "age": "72"
        }
      },
      "res": {
        "statusCode": 200
      },
      "responseTime" : 12,
      "level": "info",
      "message": "HTTP GET /favicon.ico"
    }

Blacklisting supports only the `body` property.


``` js
    router.post('/user/register', function(req, res, next) {
      req._routeWhitelists.body = ['username', 'email', 'age']; // But not 'password' or 'confirm-password' or 'top-secret'
      req._routeBlacklists.body = ['username', 'password', 'confirm-password', 'top-secret'];
      req._routeWhitelists.res = ['_headers'];
    });
```

If both `req._routeWhitelists.body` and `req._routeBlacklists.body` are set the result will be the white listed properties
excluding any black listed ones. In the above example, only 'email' and 'age' would be included.


## Custom Status Levels

If you set `statusLevels` to `true` express-winston will log sub 400 responses at info level, sub 500 responses as warnings and 500+ responses as errors. To change these levels specify an object as follows
```json
  "statusLevels": {
    "success": "debug",
    "warn": "debug",
    "error": "info"
  }
```

## Dynamic Status Levels

If you set `statusLevels` to `false` and assign a function to level, you can customize the log level for any scenario.

```js
  statusLevels: false // default value
  level: function (req, res) {
    var level = "";
    if (res.statusCode >= 100) { level = "info"; }
    if (res.statusCode >= 400) { level = "warn"; }
    if (res.statusCode >= 500) { level = "error"; }
    // Ops is worried about hacking attempts so make Unauthorized and Forbidden critical
    if (res.statusCode == 401 || res.statusCode == 403) { level = "critical"; }
    // No one should be using the old path, so always warn for those
    if (req.path === "/v1" && level === "info") { level = "warn"; }
    return level;
  }
```


## Dynamic meta data from request or response

If you set `dynamicMeta` function you can extract additional meta data fields from request or response objects.
The function can be used to either select relevant elements in request or response body without logging them as a whole
or to extract runtime data like the user making the request. The example below logs the user name and role as assigned
by the passport authentication middleware.

```js
   meta: true,
   dynamicMeta: function(req, res) {
     return {
       user: req.user ? req.user.username : null,
       role: req.user ? req.user.role : null,
       ...
   }
}
```

## Tests

Run the basic Mocha tests:

    npm test

View the coverage report:

    npx http-server coverage/lcov-report

## Issues and Collaboration

If you ran into any problems, please use the project [Issues section](https://github.com/bithavoc/express-winston/issues) to search or post any bug.

## Contributors

* [Johan Hernandez](https://github.com/bithavoc) (https://github.com/bithavoc)
* [Lars Jacob](https://github.com/jaclar) (https://github.com/jaclar)
* [Jonathan Lomas](https://github.com/floatingLomas) (https://github.com/floatingLomas)
* [Ross Brandes](https://github.com/rosston) (https://github.com/rosston)
* [Alex Kaplan](https://github.com/kapalex) (https://github.com/kapalex)
* [Matt Morrissette](https://github.com/yinzara) (https://github.com/yinzara) 

Also see AUTHORS file, add yourself if you are missing.

## MIT License

Copyright (c) 2012 Bithavoc.io and Contributors - http://bithavoc.io

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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