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    4.0.32 • Public • Published


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    Front-end logger, which will:

    • Buffer your front-end logs and periodically send them to the server side
    • Automatically flush logs for any errors or warnings

    This is a great tool to use if you want to do logging on the client side in the same way you do on the server, without worrying about sending off a million beacons. You can quickly get an idea of what's going on on your client, including error cases, page transitions, or anything else you care to log!



    var $logger = beaver.Logger({
        url: '/my/logger/url'

    Basic logging

    $<event>, <payload>);

    Queues a log. Options are debug, info, warn, error.

    For example:

    $logger.error('something_went_wrong', { error: err.toString() })


    Call this to attach general tracking information to the current page. This is useful if the data is not associated with a specific event, and will be sent to the server the next time the logs are flushed.



    Attach a method which is called and will attach general information to the logging payload whenever the logs are flushed

    $logger.addMetaBuilder(function() {
        return {
            current_page: getMyCurrentPage()


    Attach a method which is called and will attach values to each individual log's payload whenever the logs are flushed

    $logger.addPayloadBuilder(function() {
        return {


    Attach a method which is called and will attach values to each individual log's tracking whenever the logs are flushed

    $logger.addTrackingBuilder(function() {
        return {
            pageLoadTime: getPageLoadTime()


    Attach a method which is called and will attach values to each individual log requests' headers whenever the logs are flushed

    $logger.addHeaderBuilder(function() {
        return {
            'x-csrf-token': getCSRFToken()


    Flushes the logs to the server side. Recommended you don't call this manually, as it will happen automatically after a configured interval.


    • Install via npm

    npm install --save beaver-logger

    • Include in your project
    <script src="/js/beaver-logger.min.js"></script>


    let $logger = require('beaver-logger');


    Full configuration options:

    var $logger = beaver.Logger({
        // Url to send logs to
        url: '/my/logger/url',
        // Prefix to prepend to all events
        prefix: 'myapp',
        // Log level to display in the browser console
        logLevel: beaver.LOG_LEVEL.WARN,
        // Interval to flush logs to server
        flushInterval: 60 * 1000,
        // Use sendBeacon if supported rather than XHR to send logs; defaults to false
        enableSendBeacon: true,

    Server Side

    beaver-logger includes a small node endpoint which will automatically accept the logs sent from the client side. You can mount this really easily:

    let beaverLogger = require('beaver-logger/server');
        // URI to recieve logs at
        uri: '/api/log',
        // Custom logger (optional, by default logs to console)
        logger: myLogger,
        // Enable cross-origin requests to your logging endpoint
        enableCors: false

    Or if you're using kraken, you can add this in your config.json as a middleware:

          "beaver-logger": {
              "priority": 106,
              "module": {
                  "name": "beaver-logger/server",
                  "method": "expressEndpoint",
                  "arguments": [
                          "uri": "/api/log",
                          "logger": "require:my-custom-logger-module"

    Custom backend logger

    Setting up a custom logger is really easy, if you need to transmit these logs to some backend logging service rather than just logging them to your server console:

    module.exports = {
        log: function(req, level, event, payload) {
                level: level,
                event: event,
                payload: payload

    Data Flow



    npm i beaver-logger

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    • mstuart
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