Tinga

Small browser logging module with the ability to send logs to the remote endpoint

Small (~1KB) logging module primarily for the browser. It has a few logging levels that can be enabled and disabled at runtime.

• Install
• Motivation
• Usage
• Configuration
  • Context
  • Levels
  • Child instances
  • Examples

Install

npm i tinga

Motivation

While pino is an excellent logger for the backend all the functionality is not needed for the frontend, it has a bigger file size, and the default formatting doesn't suit the browser console hence, Tinga has been created.

Usage

Usage is very simple, by default you don't need to pass in any configuration, but I recommend using at least the label property for added visibility in the browser console.

import Tinga from 'tinga'

const logger = new Tinga({ label: 'demo' })
logger.log('Hello world')
logger.error('Wrong username')

Configuration

Tinga accepts a configuration object to customize the Tinga instance.

import Tinga, { type Config } from 'tinga'

const config: Config = {
  ctx: { name: 'Ivan' }, // context
  label: 'demo',
  processData: (ctx, data, _info: { level: Level; label?: string }) => {
    return {
      ctx,
      data
    }
  }
}

const logger = new Tinga(config)

• ctx: is additional data that will be logged with every log level.
• label: string to be logged right next to the level.
• processData: a function that is called just before the data is logged to the console, it should at least return an object with the data property which is an array of data to be passed to the console (as rest arguments).

Context

Context is additional data that can be set per logger instance, that will be passed to every log level. You can get and set context at runtime.

const looger = new Tinga({ ctx: { name: 'ivan' } })

logger.getContext()
logger.setContext({ name: 'Mario' })

Levels

Seven levels can be used for logging.

| Name | Value | | -------- | ----- | | trace | 10 | | debug | 20 | | info | 30 | | warn | 40 | | error | 50 | | critical | 60 | | silent | 100 |

You can get and set levels at runtime, all levels above the currently set level will be logged. silent level is the only level that is not logged, so if you want to disable logging, you can use the silent level.

logger.getLevel()
logger.setLevel('silent')
logger.getLevels() // get all levels

Child instances

You can create a child instance of an already created Tinga instance, by creating a child instance, it will inherit all the configuration properties of the parent. Child instances are useful when you want to slightly modify the original version, by for example having a different label, for modifying the parent context. For a child instance, you can directly set the new context, or by passing a function as the context property you can derive a new context from the parent context, as the example below shows.

const logger = new Tinga(config)

const childLogger = logger.child({
  label: 'new-labels',
  ctx: (parentCtx) => {
    return {
      ...parentCtx,
      newProps: 'hello from child'
    }
  }
})

childLogger.log('helo')

Examples

Check out this Next.js logging demo where I'm using (comparing) Pino and Tinga on the same page.