Multimeter – REST Client & API Testing

REST Client and API testing in VS Code. Git-native alternative to Postman, Bruno, and Thunder Client.

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🚀 Simplicity along with Power.

Multimeter combines the simplicity of Git-native tools like Bruno with the power of a complete API testing platform like Postman.

Start with a single HTTP request. Grow into tests, suites, mocks, reports, auto-generated documentation, and CI workflows when you need them.

All in the same tool. No migration required.

See full comparision

🎯 Why Multimeter?

Everything to start simply

• ✔️ Git-native
• ✔️ File-based
• ✔️ Lightweight
• ✔️ No cloud lock-in

Everything teams eventually need as projects grow

• ✔️ API testing
• ✔️ Test suites
• ✔️ Mock servers
• ✔️ Documentation
• ✔️ Reports
• ✔️ CI workflows
• ➕ & More...

🪜 Start simple, grow easily...

Multimeter is a VS Code-native extension. All you need is:

1. Click Install button in Multimeter VS Code Extension
2. Open Get Started from the activity bar and follow the instructions

There you run a POST request as follows:

type: api
title: Simple POST
url: https://test.mmt.dev/echo
method: post
format: json
body:
  message: hello

That's enough for manual API testing. Need automated tests?

Type the following to test if the status is 200.

type: test
steps:
  - http: https://test.mmt.dev/echo
    method: get
    expect:
      status: 200

• Still simple.
• Still Git-native.
• Still easy to review.

As your project grows, Multimeter grows with it.

• Test suites
• Mock servers
• Documentation
• Workflow execution
• Structured reporting
• CI artifacts
• & More...

Add only when you need them. Everything stays in the same ecosystem.

🔁 Built for reliable CI

Multimeter validates test definitions before execution.

That means:

• Earlier feedback
• More deterministic execution
• Fewer surprises in CI
• Easier debugging
• Reproducible results

GitHub Actions:

- uses: actions/checkout@v4
- uses: mshobeyri/multimeter/.github/actions/testlight@main
  with:
    file: tests/suite.mmt
    report: junit
    report-file: results/junit.xml

npm install -g mmt-testlight
mmt-testlight run tests/suite.mmt --report junit

Why Git?

Your code, tests, mocks, documentation, reports, and environment settings live in the same repository.

• Version controlled
• Code and tests evolve together
• Reviewable through pull requests
• Easy to move and share
• No platform lock-in
• AI can update code and tests together
• Environment variables never go missing
• Historical test results stay with the project

🧠 Philosophy

Most API tools focus on requests. Multimeter focuses on behavior.

Instead of asking:

"Did this request return the expected response?"

Multimeter helps you answer:

"Does this system still behave correctly?"

Licensed under Apache 2.0.

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