npm: npmjs.com/package/@digipolis/log

@digipolis/log

Log helper which converts default logs to indexable json log.

Table of contents:

• Installing
  • npm
  • Yarn
• Configuration
• Logging
• Running the tests
• Dependencies
• Versioning
• Authors
• License

Spec

https://github.com/digipolisantwerpdocumentation/logging-requirements

Installing

npm:

$ npm i @digipolis/log

Yarn:

$ yarn add @digipolis/log

Configuration

Params:

Param	Description	Values
type (optional)	Set logging mode	log (default) / json / text / silent
override (optional)	Set to override given console (default)	true / false (default)
level (optional)	Set the log level (given level and higher will be logged	debug (default) / info / log / warn / error

Examples

Example:

const digipolisLogger = require('@digipolis/log');

const mylogger = digipolisLogger(console, {
  type: 'text', // log(default) | json | text
  override: false, // false(default) | true
});

// human readable for local development
mylogger.log('hello');
/*
type: 'text' -> INFO: 2021-12-01T09:43:19.173Z hello
*/

const mylogger = digipolisLogger(console, {
  type: 'json', // log(default) | json | text
  override: false, // false(default) | true
});

// human readable json local development
mylogger.log('hello');
/*
type: 'json' -> {
  message: 'hello',
  timestamp: '2021-12-01T09:44:20.565Z',
  type: [ 'technical' ],
  level: 'INFO',
  correlationId: ''
}
*/

const mylogger = digipolisLogger(console, {
  type: 'log', // log(default) | json | text
  override: false, // false(default) | true
});
// log for kibana json for production
mylogger.log('hello');
/*
type: 'log' -> {"message":"hello","timestamp":"2021-12-01T09:45:56.515Z","type":["technical"],"level":"INFO","correlationId":""}
*/

const mylogger = digipolisLogger(console, {
  type: 'log', // log(default) | json | text
  override: false, // false(default) | true
  level: "error", // debug(default) | info | log | warn | error
});
// log for kibana json for production only error
mylogger.log('logmessage'); // -> won't be visible
mylogger.error('error');
/*
type: 'log' ->
type: 'error' -> {"message":"error","timestamp":"2021-12-01T09:45:56.515Z","type":["technical"],"level":"ERROR","correlationId":""}
*/

Example (override the global log (this will impact more than just your code)):

const digipolisLogger = require('@digipolis/log');

digipolisLogger((console, {
  type: 'text', // log(default) | json | text
  override: true, // false(default) | true
});

// human readable for local development
console.log('hello');
/*
type: 'text' -> INFO: 2021-12-01T09:43:19.173Z hello
*/

digipolisLogger((console, {
  type: 'json', // log(default) | json | text
  override: true, // false(default) | true
});
// human readable json local development
console.log('hello');
/*
type: 'json' -> {
  message: 'hello',
  timestamp: '2021-12-01T09:44:20.565Z',
  type: [ 'technical' ],
  level: 'INFO',
  correlationId: ''
}
*/

digipolisLogger((console, {
  type: 'log', // log(default) | json | text
  override: true, // false(default) | true
});
// log for kibana json for production
console.log('hello');
/*
type: 'log' -> {"message":"hello","timestamp":"2021-12-01T09:45:56.515Z","type":["technical"],"level":"INFO","correlationId":""}
*/

output examples

// type: json
console.log('hello');
/*
{
  message: 'hello',
  timestamp: '2021-12-01T09:44:20.565Z',
  type: [ 'technical' ],
  level: 'INFO',
  correlationId: ''
}
*/

// type: json
console.error('hello');
/*
{
  message: 'hello',
  timestamp: '2021-12-01T09:44:20.565Z',
  type: [ 'technical' ],
  level: 'ERROR',
  correlationId: ''
}
// type: json
*/

console.error(new Error('Errormessage'));
/*
{
  message: 'Errormessage Error: Errormessage\n' +
    '    at Object.<anonymous> (/Users/oliviervandenmooter/Projects/Digipolis/diglog/example/index.js:17:13)\n' +
    '    at Module._compile (node:internal/modules/cjs/loader:1095:14)\n' +
    '    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1124:10)\n' +
    '    at Module.load (node:internal/modules/cjs/loader:975:32)\n' +
    '    at Function.Module._load (node:internal/modules/cjs/loader:816:12)\n' +
    '    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:79:12)\n' +
    '    at node:internal/main/run_main_module:17:47',
  timestamp: '2021-12-01T11:00:13.073Z',
  type: [ 'technical' ],
  level: 'ERROR',
  correlationId: ''
}
*/

// structured message
console.log({ message: 'logmessage2', timestamp: 'timestamp123' })
/*
{
  message: 'logmessage2',
  timestamp: 'timestamp123',
  type: [ 'technical' ],
  level: 'INFO',
  correlationId: ''
}

// structured message with extra params
*/
console.log({ message: 'logmessage2', timestamp: 'timestamp123', extra_param1: "extra_value" });

/*
{
  message: 'logmessage2 Extrainfo: {"extra_param1":"extra_value"}',
  timestamp: 'timestamp123',
  type: [ 'technical' ],
  level: 'INFO',
  correlationId: ''
}
*/

Running the tests

Run the tests in this repo:

$ npm run test
$ npm run coverage

Dependencies

none.

Versioning

We use SemVer

for versioning. For the released version check changelog / tags

Contributing

Pull requests are always welcome, however keep the following things in mind:

• New features (both breaking and non-breaking) should always be discussed with the repo's owner. If possible, please open an issue first to discuss what you would like to change.
• Fork this repo and issue your fix or new feature via a pull request.
• Please make sure to update tests as appropriate. Also check possible linting errors and update the CHANGELOG if applicable.

Authors

• Olivier Van den Mooter ([e-mail]) - Initial work - Vademo

See also the list of contributors who participated in this project.

License

This project is licensed under the MIT License - see the LICENSE.md file for details