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How to contribute to Kuzzle

Here are a few rules and guidelines to follow if you want to contribute to Kuzzle and, more importantly, if you want to see your pull requests accepted by Kuzzle team.

Coding style

We use most of the NPM Coding Style rules, except for these ones:

  • Semicolons at the end of lines
  • 'Comma first' rule is not followed


  • Use promises instead of callbacks as often as you can.
  • If you add new functions, files or features to Kuzzle, then implements the corresponding unit and/or functional tests. We won't accept non-tested pull requests.
  • Documentation and comments are more important than code: comment your code, use jsdoc for every new function, add or update markdown documentation if need be. We won't accept non-documented pull requests.
  • Similar to the previous rule: documentation is important, but also is code readability. Write self-describing code.

General rules and principles we'd like you to follow


For development only, we built a specific docker-compose file: docker-compose/dev.yml. You can use it to profile, debug, test a variable on the fly, add breakpoints and so on, thanks to chrome-devtools.
Check the logs at the start of Kuzzle using the development docker image to get the appropriate debug URL.

How to run the development stack (needs Docker 1.10+ and Docker Compose 1.8+):

# clone this repository
git clone
cd kuzzle

# don't forget to retreive default plugins embeded in submodules
git submodule init
git submodule update

# start kuzzle with development tools enabled
docker-compose -f docker-compose/dev.yml up

You can now access to http://localhost:7512 for the standard Kuzzle HTTP, WebSocket and APIs

Everytime a modification is detected in the source files, the server is automatically restarted and a new debug URL is provided.

Create a plugin

See our plugins documentation

Running Tests

With a running Kuzzle inside a docker container

Because functional tests need a running Kuzzle environment, if you're using docker to run Kuzzle, then they can only be started from inside a Kuzzle container.

$ docker exec -ti <kuzzle docker image> npm test

Using docker, without any Kuzzle instance running

A docker-compose script is available to run tests on a non-running Kuzzle. This script will pop a Kuzzle stack using Docker, automatically run tests, and exit once done.

$ docker-compose -f docker-compose/test.yml up

With a manually installed and running Kuzzle

From the Kuzzle source directory, launch the following command line:

$ npm test