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    0.3.1 • Public • Published

    Chow Chow | Logger

    Provides logging to chowchow using winston with npm logging levels.


    // An example endpoint using the logger
    export async function listProducts({ req, res, logger }: Context) {
      if (!req.query.token) {
        logger.error('Unauthenticated session')
      } else {'Authenticated', { token: req.query.token })
      try {
        let products = await fetchProducts()
        logger.debug(`Found ${products.length} product(s)`)
        res.send({ products })
      } catch (error) {
        res.status(500).send({ msg: 'Something went wrong' })

    Here is how you set it up:

    import { ChowChow, BaseContext } from '@robb_j/chowchow'
    import { LoggerModule, LoggerContext } from '@robb_j/chowchow-logger'
    type Context = BaseContext & LoggerContext
    ;(async () => {
      let chow = ChowChow.create<Context>()
      chow.use(new LoggerModule({ path: 'path/to/logs' }))
      await chow.start()


    • Adds logger to the context, a winston.Logger instance
      • Save logs to the path specified by path option
      • Configure what is logged with LOG_LEVEL env variable
      • Logs are written to different files in your log folder
    • Optionally log http requests by passing enableAccessLogs
      • Exclude routes using excludeRoutes parameter, tested against req.path
    • Optionally log errors from http requests by passing enableErrorLogs
    • Has different levels of logging, using winston's npm levels
    • Configure which levels are written to files in your log folder by passing persistentLevels
      • Defaults to write error, warn, info and debug to their own files
      • Following winston, logs levels are inherited so higher levels are included in the lower ones. E.g. info logs will include all warn and error messages.

    Environment variables

    Set the LOG_LEVEL environment variable to configure which log levels are processed.

    For example, if it is set to error, only error messages will be logged and written to files. All logs at and under the level you set will be logged, so if you want everything set it to silly.

    For more see: npm logging levels


    There is one required constructor parameter:

    • path: string - This is the path to a folder where your logs will be stored. The folder will be created if it doesn't exist.

    There are also option parameters to enabled additional features:

    • enableAccessLogs: boolean – Turn on http traffic logging (default: false)
    • excludeRoutes: RegExp[] – An array of RegExps to match paths you don't want to log (default: [])
    • enableErrorLogs: boolean – Turn on error logging, logs errors caught inside endpoints (default: false)
    • persistentLevels: string[] – Which log levels you want to be written to files (default: error, warn, info, debug)

    Dev Commands

    # Run the app in dev mode
    npm run dev:once
    # Run in dev mode and restart on file changes
    npm run dev:watch
    # Lint the source code
    npm run lint
    # Manually format code
    # -> This repo runs prettier on git-stage, so committed code is always formatted
    npm run prettier
    # Run the unit tests
    npm test
    # Generate code coverage in coverage/
    npm run coverage


    npm i @robb_j/chowchow-logger

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