winston middleware for express.js
npm install express-winston
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.
Use expressWinston.errorLogger(options) to create a middleware that log the errors of the pipeline.
app.use(app.router); // notice how the router goes first.
app.use(expressWinston.errorLogger({
transports: [
new winston.transports.Console({
json: true,
colorize: true
})
]
}));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.
transports: [<WinstonTransport>], // list of all winston transports instances to use.
level: String // log level to use, the default is "info".Use expressWinston.logger(options) to create a middleware to log your HTTP requests.
app.use(expressWinston.logger({
transports: [
new winston.transports.Console({
json: true,
colorize: true
})
]
}));
app.use(app.router); // notice how the router goes after the logger. var express = require('express');
var expressWinston = require('express-winston');
var winston = require('winston'); // for transports.Console
var app = module.exports = express.createServer();
app.use(express.bodyParser());
app.use(express.methodOverride());
// express-winston logger makes sense BEFORE the router.
app.use(expressWinston.logger({
transports: [
new winston.transports.Console({
json: true,
colorize: true
})
]
}));
app.use(app.router);
// express-winston errorLogger makes sense AFTER the router.
app.use(expressWinston.errorLogger({
transports: [
new winston.transports.Console({
json: true,
colorize: true
})
]
}));
// Optionally you can include your custom error handler after the logging.
app.use(express.errorLogger({
dumpExceptions: true,
showStack: true
}));
app.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"));
});
app.get('/', function(req, res, next) {
res.write('This is a normal request, it should be logged to the console too');
res.end();
});
app.listen(3000, function(){
console.log("express-winston demo listening on port %d in %s mode", app.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"
}
New in version 0.2.x is the ability to add whitelist elements in a route. express-winston adds a _routeWhitelists object to the request, 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:
app.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"
}
npm test
- Implement a chain of requestFilters. Currently only one requestFilter is allowed in the options.
We are accepting pull-request for these features.
If you ran into any problems, please use the project Issues section to search or post any bug.
- Johan Hernandez (https://github.com/thepumpkin1979)
- Lars Jacob (https://github.com/jaclar)
- Jonathan Lomas (https://github.com/floatingLomas)
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