kassette

kassette is a development server, used mainly for testing, which proxies requests and
is able to easily manage local mocks.

To use it:

• install with npm install @amadeus-it-group/kassette
• add this command to your package.json scripts: kassette -c kassette.config.js
• and create the configuration file kassette.config.js:

/**
 * @return { import("@amadeus-it-group/kassette").ConfigurationSpec }
 */
exports.getConfiguration = () => {
  return {
    port: 4200,
    mocksFolder: './mocks-folder',
    remoteURL: 'http://127.0.0.1:3000',
    mode: 'local_or_download',

    hook: async ({ mock }) => {
      if (!mock.request.pathname.startsWith('/api/')) {
        mock.setMode('remote');
        return;
      }

      mock.setLocalPath([mock.request.pathname.split('/').slice(1), mock.request.method]);
    },
  };
};
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Now run your script to launch the proxy!

With this configuration, input requests targeting URLs starting with /api/ will get processed, and local mocks will be used if present, otherwise data will be downloaded from http://127.0.0.1:3000 with a forwarded request, persisted and used for future input requests.

Note that kassette can also be configured to run as a browser proxy, reading the target URL from the request, and intercepting HTTPS communications.

Check Getting started to learn more.

Main features

• optionally forward requests to a remote backend
• record backend responses for later use
• easily computed and set local mock path
• fill response to client from backend response, downloaded or persisted
• modify response to client manually
• can optionally act as the browser proxy
• generate TLS certificates on the fly to intercept HTTPS communications (as a man-in-the-middle)
• integrates nicely into your editor and source control: a simple hierarchy of files is generated in a clean way for inspection, edition, diffing, etc.
• supports the HAR format to record and replay mocks, either in JSON or in YAML
• supports HTTP/1.x and HTTP/2.0 both in client and server

Installation

This is a Node.js project using npm for dependency management, so ensure you have those two properly installed. Node.js LTS onwards is supported.

With npm, you can install it in two locations:

• locally inside your project and run it the usual way (using a npm script or accessing the path explicitly node_modules/.bin/kassette)
• or install it globally and run it using the command kassette (not advised for self-contained projects)

Besides where it is installed, you have at least two ways to install it:

• from the npm registry: package's name is @amadeus-it-group/kassette
• from a git clone (see below)

Installing from a git clone

Clone this repository, and run npm link to install it globally on your computer.

If you want to use it globally only, then there is nothing more to do.

If you want to install it locally though, you need to add one more step. You won't be able to use a package.json dependency, but you can install it manually using npm link @amadeus-it-group/kassette from inside your project.

User documentation

It is advised to start with the Getting started article which describes a few practical usage examples, then check the configuration guide and the API guide. The API reference is also available.

Developing / Contributing

See developer guide for details.