Skip to content
Track client side Javascript errors in real time.
JavaScript HTML CSS
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

OpenLog - Track client side Javascript errors in real time. Build Status

OpenLog is a lightweight front end Javascript plugin (< 1kb gzipped!) that sends your user's console errors & warnings in real time to a dynamic dashboard built with Node.


  1. Include the dist/capture.min.js file on any page you want to capture the errors and logs for
<script src="path/to/capture.min.js" type="text/javascript"></script>
  1. Install globally with npm: npm install -g openlog
  2. Start the open log server: openlog

...and that's it! Now you can access your instance of OpenLog at The default login credentials are:

username: openlog
password: password

Changing Settings

Configuration options for OpenLog are set in / To find where your copy of OpenLog is installed, run the following command:

$ npm root -g
> /usr/local/lib/node_modules

This command returns the path where global npm packages are installed on your machine. Once you know this path, you can visit the OpenLog directory with: cd <insert_node_path_here>/openlog. You can then modify the / file...

Setting Description
Username Username used to access the admin panel with. Default: openlog
Password Password used to access the admin panel with. Default: password
Port The server port that the OpenLog admin panel runs on. Default: 4783

Once you have modified those values you can build your own version of OpenLog by running these commands in the root OpenLog directory:

npm install -g grunt-cli
npm install
grunt build

Amungst other things, this will build a new dist/capture.min.js file. It's now simply a matter of including this new file on your HTML pages, and starting up the OpenLog server again with your new compiled settings.

Usage / Other Configuration

If you are already logging using console.log,, console.warn and console.error then OpenLog requires no extra work at all. It will capture errors globally on your page and listen to calls to the above console functions. Alternatively, if you don't want to explicitly log information to the clients console, you can use OpenLog's built in methods:

  • Log.error();
  • Log.warn();

Log is a globally defined object by the capture.min.js file.

Error Limiting

If you don't want to capture certain logging types you simply add a data-capture parameter to the script tag that loaded the capture.min.js file and set it to be the types of logs you wish to capture. For instance, if you only want error logs:

<script src="path/to/capture.min.js" type="text/javascript" data-capture="error"></script>

...or if you want error and warning logs data-capture="warn error" etc etc.

Modify OpenLog Server URL

By default, OpenLog assumes that the dashboard is running on the same domain as the frontend it sends logs from (default port is 4783). To change this, you can specify the logging URL by setting a data-log-url="" attribute on the script tag that loaded the capture.min.js:

<script src="path/to/capture.min.js" type="text/javascript" data-log-url=""></script>

Domain Limiting

A final configurable option is to use data-restrict-to parameter on the script tag. This setting allows you to specify domain name(s) permitted to send logs to the OpenLog server, and is particularly useful for reporting console noise only in a staging/production environment (as opposed to developers working locally). By default, OpenLog will send logs from all sources.

<!-- Use a HOSTNAME, not a full domain like above -->
<script src="path/to/capture.min.js" type="text/javascript" data-restrict-to=""></script>

To restrict multiple domains, use spaces to separate them, eg - data-restrict-to="".

Updating OpenLog

Fancy, smooth, no data loss updating method coming soon :)


All PR's and issues are welcomed with open arms.

  1. Fork this repository.
  2. Create a new branch: git checkout -b my-new-feature.
  3. Make your changes and add some commits.
  4. Push your changes to GitHub and send in a pull request to this repository.


  • node.js > 0.10
  • npm


Samuel Attard - - -


OpenLog is licensed under the MIT License - see the LICENSE file for details.

You can’t perform that action at this time.