jsonconsole

A no-dependency console.{log,error,..} replacement that outputs JSON bunyan compatible output to stderr & stdout

No configuration, use process.env.LOG_LEVEL to ensure log output level.

require('jsonconsole')();
 
console.error('foo'); // will output JSON to STDERR (with err stack trace) 
console.log('foo'); // will output JSON to STDOUT 
// {"name":"myapp","hostname":"myhost","pid":64,"level":20,"msg":"foo","time":"2017-01-18T21:02:18.780+01:00","src":{"file":"test.js","line":10,"r":"/projects"},"levelName":"DEBUG","v":0}
 

That's it, now console.log, console.info, console.debug, and console.warn outputs json lines to process.stdout.

console.error will output to process.stderr.

var  = require('jsonconsole').RawValue;
 
console.log(new RawValue({
    a: 'Raw', value: [1,2,4]
})); 
/*
    {"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":33000,"level":20,"msg":"{ a: 'Raw', value: [ 1, 2, 4 ] }","raw":{"a":"Raw","value":[1,2,4]},"time":"2017-01-19T19:00:48.144+01:00","src":{"file":"example.js","line":27,"r":"/Users/evaisse/Sites/projects/node-jsonconsole"},"levelName":"DEBUG","v":0}
 */ 
 
// restoreConsole(); to restore original console API.

env configuration

you can use environment conf to

# to forbid JSONCONSOLE to override default console
JSONCONSOLE_DISABLE

# to allow logging but with raw output
JSONCONSOLE_DISABLE_JSON_OUTPUT 

# to disable output logging < LOG_LEVEL
# by default NODE_ENV=production will set this to LOG_LEVEL=info
LOG_LEVEL=info,debug,error

Out-Of-The-Box Features

• Every line is decorated with a trace to your original console.* call
• No Dependencies
• Providing root app dirname will reduce size of the path & auto bind you package.json name to logger

Example

let restoreConsole = require('./jsonconsole')();
let err = new Error();
let i = {};
 
i.i = i; // circular references are not JSON.stringify friendly
 
console.log('foo', 'bar', i);
console.debug('klkjljkl');
console.info('klkjljkl');
console.warn('klkjljkl');
console.error('klkjljkl');
console.info(new Error());

outputs

{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":20,"msg":"foo","time":"2017-01-18T21:02:18.780+01:00","src":{"file":"test.js","line":10,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"","levelName":"DEBUG","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":20,"msg":"bar","time":"2017-01-18T21:02:18.784+01:00","src":{"file":"test.js","line":10,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"","levelName":"DEBUG","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":20,"msg":"{ i: [Circular] }","time":"2017-01-18T21:02:18.787+01:00","src":{"file":"test.js","line":10,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"","levelName":"DEBUG","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":20,"msg":"klkjljkl","time":"2017-01-18T21:02:18.787+01:00","src":{"file":"test.js","line":11,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"","levelName":"DEBUG","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":30,"msg":"klkjljkl","time":"2017-01-18T21:02:18.787+01:00","src":{"file":"test.js","line":12,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"","levelName":"INFO","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":40,"msg":"klkjljkl","time":"2017-01-18T21:02:18.788+01:00","src":{"file":"test.js","line":13,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"Error\n    at write ({root}/jsonconsole.js:97:54)\n    at Array.slice.call.forEach ({root}/jsonconsole.js:147:17)\n    at Array.forEach (native)\n    at Console.console.(anonymous function) [as warn] ({root}/jsonconsole.js:146:51)\n    at Object.<anonymous> ({root}/test.js:13:9)\n    at Module._compile (module.js:570:32)\n    at Object.Module._extensions..js (module.js:579:10)\n    at Module.load (module.js:487:32)\n    at tryModuleLoad (module.js:446:12)\n    at Function.Module._load (module.js:438:3)","levelName":"WARN","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":50,"msg":"klkjljkl","time":"2017-01-18T21:02:18.788+01:00","src":{"file":"test.js","line":14,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"Error\n    at write ({root}/jsonconsole.js:97:54)\n    at Array.slice.call.forEach ({root}/jsonconsole.js:147:17)\n    at Array.forEach (native)\n    at Console.console.(anonymous function) [as error] ({root}/jsonconsole.js:146:51)\n    at Object.<anonymous> ({root}/test.js:14:9)\n    at Module._compile (module.js:570:32)\n    at Object.Module._extensions..js (module.js:579:10)\n    at Module.load (module.js:487:32)\n    at tryModuleLoad (module.js:446:12)\n    at Function.Module._load (module.js:438:3)","levelName":"ERROR","v":0}
{"name":"jsonconsole","hostname":"Mac-mini-de-Emmanuel.local","pid":6471,"level":30,"msg":"Error\n    at Object.<anonymous> (/Users/evaisse/Sites/projects/jsonconsole/test.js:15:14)\n    at Module._compile (module.js:570:32)\n    at Object.Module._extensions..js (module.js:579:10)\n    at Module.load (module.js:487:32)\n    at tryModuleLoad (module.js:446:12)\n    at Function.Module._load (module.js:438:3)\n    at Module.runMain (module.js:604:10)\n    at run (bootstrap_node.js:394:7)\n    at startup (bootstrap_node.js:149:9)\n    at bootstrap_node.js:509:3","time":"2017-01-18T21:02:18.788+01:00","src":{"file":"test.js","line":15,"r":"/Users/evaisse/Sites/projects/jsonconsole"},"stack":"","levelName":"INFO","v":0}

And while using node test.js 2>&1 | bunyan you get the nice colored filter enabled bunyan output. Just install npm install -g bunyan