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wtf is matoi?

ddries/matoi — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2022-03-05

GoAudience · developerComplexity · 1/5DormantSetup · easy

TL;DR

Matoi is a lightweight command-line tool that connects to websocket servers, letting you type messages to send and see replies print back, for quick manual testing.

Mindmap

mindmap
  root((repo))
    What it does
      Connects to websockets
      Sends typed messages
      Prints replies
    Tech stack
      Go
      CLI
    Use cases
      Test websocket servers
      Debug chat systems
      Verify live notifications
    Audience
      Backend developers
    Notes
      No setup needed
      Starts instantly

Code map

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Why would anyone build with this?

REASON 1

Manually test a websocket server during development without writing client code.

REASON 2

Debug a real-time chat or notification system by sending test messages from the terminal.

REASON 3

Quickly verify a collaborative tool's websocket logic sends and receives correctly.

What's in the stack?

Go

How it stacks up

ddries/matoi42wim/fabio42wim/go-xmpp
LanguageGoGoGo
Last pushed2022-03-052018-02-042020-01-24
MaintenanceDormantDormantDormant
Setup difficultyeasymoderatemoderate
Complexity1/53/53/5
Audiencedeveloperops devopsdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 5min

Requires compiling from source with Go 1.17+ since there are no prebuilt binaries mentioned.

Wtf does this do

Matoi is a lightweight tool that lets you talk to websocket servers directly from your command line. Think of it as a chat interface for testing, you type messages into your terminal, they get sent to a websocket server, and any responses come back and print to your screen. It's designed specifically for developers who are building or debugging websocket servers and need a quick way to send test messages without writing code. The way it works is straightforward. You run the tool with a server address (a websocket URL), and it opens a connection to that server. Then you can type messages directly into your terminal, each line you enter gets sent to the server as plain text. Any messages the server sends back appear immediately in your terminal. It's essentially a two-way text exchange, making it easy to see exactly what your server is responding with. Developers building real-time applications, chat systems, live notifications, collaborative tools, or any service that uses websockets, would use this during development and testing. Instead of spinning up a full client application or writing test code, you can just run matoi, connect to your development server, and manually test if messages are being sent and received correctly. It's a fast, no-fuss way to verify your websocket logic is working as expected. The tool is written in Go, a systems programming language known for being lightweight and fast. To get started, you download the source code and compile it yourself using Go version 1.17 or newer, then you're ready to use it. Because it's so minimal and focused on one job, it starts instantly and requires almost no setup, making it handy to have in your toolkit when you're actively developing websocket features.

Yoink these prompts

Prompt 1
Show me how to connect matoi to my local websocket server for testing.
Prompt 2
Explain how to compile matoi from source using Go 1.17 or newer.
Prompt 3
Help me use matoi to debug why my websocket server isn't responding to messages.
Prompt 4
Write a quick test script that fires messages at matoi from another terminal to simulate a client.

Frequently asked questions

wtf is matoi?

Matoi is a lightweight command-line tool that connects to websocket servers, letting you type messages to send and see replies print back, for quick manual testing.

What language is matoi written in?

Mainly Go. The stack also includes Go.

Is matoi actively maintained?

Dormant — no commits in 2+ years (last push 2022-03-05).

How hard is matoi to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is matoi for?

Mainly developer.

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