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    jobi

    1.0.0 • Public • Published

    jobi

    Tiny logging utility with events, streams, and sane defaults.

    const logger = require('jobi');
    logger.warn(`Soon we'll be jobiing our logs 🤯`);

    Lore

    Jobi is a fictional tree from Thomas the Tank Engine that is logged. That's all folks.

    Jumping Jobi Wood

    Features

    • Pretty (default), JSON, and custom formats
    • Configurable stdout and stderr streams
    • Singleton by default
    • Shared or local format and level
    • Error stack serialization

    Levels

    stdout

    • trace
    • debug
    • info

    stderr

    • warn
    • error
    • critical

    Each value implicitly includes all levels above itself – so, for example, when your app is run with NODE_DEBUG=warn node app.js, all warn, error, and critical logs will be sent to stdout/stderr. In the same example, logger.info() and logger.debug() would effectively be no-ops.

    API

    logger.log(level, message, [...interpolationValues])

    • level (string): one of the levels defined above
    • message (string): an optional message. If the message is a format string, it will use the interpolationValues as the format parameters.
    • [...interpolationValues] (...any): optional values to use to format the message using util.format(). Otherwise, these values will be appended to the message.

    logger.<level>(message, [interpolationValues])

    The same as logger.log, but without the need to pass the level as a parameter. Prefer using these to logger.log.

    logger.format (Log => string)

    Get the current log format OR set the current log format for this Jobi instance. By default, a Jobi instance will use the shared log format. Set logger.format = null to resume using the shared log format.

    Log:

    • timestamp (string)
    • level (string)
    • message (string | undefined)

    Jobi.level (string)

    Get the shared log level OR set the shared log level.

    Jobi.format (Log => string)

    Get the shared log format OR set the shared log format.

    new Jobi(opts)

    opts
    • [format] (string | (Log => string))
    • [stdout] (stream.Writable)
    • [stderr] (stream.Writable)
    Example
    logger.log('info', 'This is an info log');
     
    // Preferred
    logger.info('This is another info log');

    NOTE: logger.log has the same argument signature as console.log.

    Configuration

    Log Level

    jobi will read the initial log level from the NODE_DEBUG environment variable.

    The NODE_DEBUG environment variable can actually contain multiple flags, but the one with the lowest priority level will win. For example, NODE_DEBUG=debug,info,critical node app.js will use debug as the log level, since it automatically includes the other levels.

    NOTE: If the log level is not set, jobi will not write any logs.

    Log Format

    jobi will read the initial log format from the JOBI_FORMAT environment variable.

    Possible formats:

    • pretty
    • json

    Events

    Each log level will emit an event of the same name if the log level is high enough. For example, logger.critical('foo'); will emit a 'critical' event whose callback argument will be of type Log.

    This way, applications can hook in to the logging system and respond however they want (post to Slack, send to a logging service, etc.).

    Streaming

    By default, logs are written to either process.stdout or process.stderr.

    Apps can optionally overwrite logger.stdout and logger.stderr with other instances of stream.Writable in order to stream logs to the filesystem, via HTTP, to a database, etc.

    Node.js Compatibility

    jobi requires >= Node.js 8.3.

    Examples

    Logging
    const logger = require('jobi');
     
    logger.critical( 'this is a %s with some %s', 'log', 'formatting' );
    Event binding
    const logger = require('jobi');
     
    logger.on( 'critical', msg => slack.notify( msg ) );
    logger.on( 'error', (msg, log) => {
      slack.notify(msg);
      console.error(log.stack);
    })
    Streaming
    const logger = require('jobi');
    const fs     = require('fs');
     
    const file = fs.createWriteStream('./log.txt');
    logger.stdout = file;
    logger.stderr = file;
     
    logger.info('blah blah blah');
    Custom Jobi Instance
    const { Jobi } = require('jobi')
    const format = log => '>> ' + log.message || 'No message';
     
    const logger = new Jobi({ format });
    logger.info('Hello world'); // ">> Hello world"

    Install

    npm i jobi

    DownloadsWeekly Downloads

    1

    Version

    1.0.0

    License

    MIT

    Unpacked Size

    212 kB

    Total Files

    27

    Last publish

    Collaborators

    • kevincennis