node-trace

Simple node tracing library (ES6) for logging to stdout, stderr and JSON files using bunyan.

Installation

$ npm i -S @ojvazquez/node-trace

Example

const Trace = require('@ojvazquez/node-trace');

// Should call init() once before using the library.
Trace.init({
  appName: 'node-trace',
  logFolder: './logs',
  isDev: false
});

Trace.info('Hello world');

try {
	throw new Error();
} catch(err) {
	Trace.error('Something went wrong', err);
}

Note: Add logs/ to your .gitignore file.

API

All functions on class Trace are static, meaning you that should not instance it.

Trace.init([options])

Should call this function once before using the library.

options: an optional object containing some configuration:

• appName: the name of your application, defaults to node-trace
• logFolder: where to store the log files, defaults to logs/
• isDev: whether to output to files or stdout, defaults to false if NODE_ENV is test or production

Trace.fatal(msg, [err])

The service/app is going to stop or become unusable now. An operator should definitely look into this soon.

msg: String, message to log on error.json file.

err: Object (optional), exception stack.

Trace.error(msg, [err])

Fatal for a particular request, but the service/app continues servicing other requests. An operator should look at this soon(ish).

msg: String, message to log on error.json file.

err: Object (optional), exception stack.

Trace.warn(msg, [fields])

A note on something that should probably be looked at by an operator eventually.

msg: String, message to log on warn.json file.

fields: Object (optional), merged into the log record.

Trace.info(msg, [fields])

Detail on regular operation.

msg: String, message to log on info.json file.

fields: Object (optional), merged into the log record.

Trace.debug(msg, [fields])

Anything else, i.e. too verbose to be included in "info" level.

msg: String, message to log on info.json file.

fields: Object (optional), merged into the log record.

Trace.trace(msg, [fields])

Logging from external libraries used by your app or very detailed application logging.

msg: String, message to log on info.json file.

fields: Object (optional), merged into the log record.