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

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🚀 The simplicity of Bruno. The power of Postman.

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

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.

🫤 Tired of fighting your API testing tools?

Coming from Postman?

• ✅ Powerful ecosystem

• ✅ Rich API tooling

• ✅ Collaboration features

• ❌ Huge collections

• ❌ JavaScript test scripts everywhere

• ❌ CI pipelines behaving differently than local runs

• ❌ Environment sprawl

• ❌ Tests tied to a platform

• ❌ Hidden state scattered across workspaces

Coming from Bruno?

• ✅ Git-native

• ✅ Lightweight

• ✅ Simple

• ❌ Repeated request definitions

• ❌ Multi-step API workflows

• ❌ Large test suites

• ❌ Keeping mocks in sync

• ❌ CI reports

• ❌ Generated documentation

🎯 Why Multimeter?

Everything developers love about Bruno

• ✅ 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

Without switching tools. Without the usual tradeoff.

Tool	Tradeoff
Postman	Powerful but heavy
Bruno	Simple but limited
Multimeter	Simple by default. Powerful when needed.

See all features →

⚡ Start simple

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

• Click Install button in Multimeter VS Code Extension
• 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.

• No suites.
• No mocks.
• No workflows.
• No complexity.

🧪 Need tests?

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

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

🚀 Scale without switching tools

As your project grows, Multimeter grows with it.

Add:

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

Only when you need them.

Everything stays in the same ecosystem.

See all examples →

🔁 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

Or from a terminal:

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

See the GitHub Action and Testlight install.

📦 Everything stays in 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?"

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License

Multimeter is licensed under the Apache License 2.0.

Demos · Documentation · Website · GitHub