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    0.2.2 • Public • Published

    Akita | A WebSocket CLI

    A node.js command line interface for interacting with a WebSocket server. Useful for sending specific or predefined messages over a WebSocket.

    A usage example

    Table of contents

    An example

    # Connect to a WebSocket server (Exit with Ctrl+C) 
    akita ws://localhost:3000
    # Send up a specific json payload 
    > {"type""message""body""Hello, world!"}
    # Send a predefined message (defined in an .akitarc file) 
    > @myCustomMessage


    These are the different ways you can install, in no particular order.

    # Install with npm 
    npm i -g akita-ws
    # Install as a development dependancy 
    npm i --save-dev akita-ws


    Below are the different things you can do.

    # Connect to a web socket server 
    # -> Any line you enter after this is emitted to the server 
    # -> Stop with a Ctrl+C 
    akita ws://localhost:3000
    # Run an echo server 
    # -> Start an echo server, which will echo back any message you emit 
    # -> You should probably run this in a new terminal tab 
    # -> Run on a specific port with: "--port 1337" 
    # -> Stop with a Ctrl+C 
    akita echo
    # See usage info 
    akita --help
    akita echo --help

    Predefined messages

    You can use an .akitarc file to specify predefined message you want to send. akita uses cosmiconfig to load config files, so you can use: .akitarc, akitarc.json, akitarc.yml or akitarc.js if you want.

    Say you have an .akitarc.yml file:

    # Use this block to define you messages
      # You can use a string value
      helloWorld: A really long string payload
      # Or you can use an object which will be serialised with JSON.stringify()
        name: Geoff
        age: 42

    Then you can use do:

    # Connect to akita 
    akita ws://localhost:3000
    # Send a predefined string payload 
    > @helloWorld
    # Send a predefined JSON payload (uses JSON.stringify()) 
    > @customData

    Predefined URLs

    You can also specify the WebSocket server's url in your .akitarc file.

    url: ws://localhost:3000

    Then you can run akita without a url argument.



    You can send headers to the socket request with --header key:value or with the headers section of the yaml.

    akita ws://localhost:3000 --header authorization:top_secret

    or in .akitarc.yml

      authorization: top_secret

    Using the API

    You can use akita programatically by importing it in TypeScript or JavaScript. You might want to install it as a production dependancy in this case.

    Here's an example script.js:

    const { Akita, EchoServer } = require('akita-ws')
    const [, , cmd, ...args] = process.argv
    if (cmd === 'run') {
      const [url] = args
      // Run akita with a url{ url })
    if (cmd === 'echo') {
      const [port] = args

    I'm not sure what this is useful for, but it's possible. For detailed usage see the source code.


    Below is information about development on the project.


    To develop on this repo you will need to have node.js installed on your dev machine and have an understanding of it. This guide assumes you have the repo checked out and are on macOS.

    You'll only need to follow this setup once for your dev machine.

    # Install dependancies 
    npm install
    # (optional) Add an config file (.akitarc, .akitarc.yml, .akitarc.json or .akitarc.js) 
    touch .akitarc

    Regular use

    These are the commands you'll regularly run to develop the CLI, in no particular order.

    # Run the CLI directly with ts-node 
    # -> Runs TypeScript on the fly without transpiles to JavaScript 
    # -> Use "-s" to stop npm debug output 
    # -> Use "--" to stop npm stealing CLI arguments 
    #    (they get passed to npm instead of our CLI) 
    npm run dev -s --

    Irregular use

    These are commands you might need to run but probably won't, also in no particular order.

    # Generate the table of contents for this readme 
    # -> It'll replace content between the toc-head and toc-tail HTML comments 
    # -> This runs as part of the "preversion" script 
    npm run gen-readme-toc
    # Manually lint code with TypeScript's `tsc` 
    npm run lint
    # Manually format code 
    # -> This repo is setup to automatically format code on git-push 
    npm run prettier
    # Manually transpile TypeScript to JavaScript 
    # -> This is part of the packaging which is triggered when deploying 
    # -> Writes files to dist, which is git-ignored 
    npm run build
    # Manually start code from transpilled JavaScript 
    npm run start

    Code Structure

    Folder Contents
    dist Where the transpiled javascript and type definitions go
    node_modules Where npm's modules get installed into
    src Where the code for the CLI is

    Code formatting

    This repo uses Prettier to automatically format code to a consistent standard. It works using the husky and lint-staged packages to automatically format code whenever code is commited. This means that code that is pushed to the repo is always formatted to a consistent standard.

    You can manually run the formatter with npm run prettier if you want.

    Prettier is slightly configured in .prettierrc.yml and also ignores files using .prettierignore.


    Use npm's version and publish command to push a new version to

    There is a preversion that does a few things:

    • Runs unit tests
    • Generates the table of contents in this readme
    • Transpiles typescript assets into javascript & type definitions
    • Adds those changes to git

    Future work

    Some ideas I've had for where I want this project to go.

    • Parameterised / templated predefined messages
    • Different / custom serialisation methods (other that JSON.stringify)
    • Add unit test coverage
    • Single usage like akita ws://localhost @customData @hello ...
    • Read the akitarc on the fly incase it changes after starting
    • Document piped usage, cat data.json | akita

    This project was setup with robb-j/ts-node-base


    npm i akita-ws

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