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bruno – Fast, Open‑source IDE for API Exploration & Testing (47k+ GitHub stars)

A lightweight alternative to Postman, bruno lets founders quickly prototype, debug, and automate REST, GraphQL, and OpenAPI calls—all within a single IDE.

From the repo · “Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)”

47,802 stars+188★ this week3,020 forksJavaScriptGuide quality 9/10 · reviewed Sep 29Updated 10/22/2026100% free · open source
What it does

Bruno is a free, lightweight, open-source API testing tool that allows founders and developers to explore and test APIs in a simple and intuitive way.

When to use it
  • •When you need to quickly test and validate API endpoints
  • •When you want a lightweight alternative to Postman or Insomnia
  • •When you need to collaborate with team members on API testing and debugging
Ready-to-paste prompt
Use the following command to send a GET request to the JSONPlaceholder API: `curl https://jsonplaceholder.typicode.com/posts`
Heads up: Make sure you have Node.js (version 16 or higher) and npm installed on your system before trying to install and run Bruno
Saves to your device
Use with Claude
New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

🛠️ Technical setup

Expect 20–40 minutes in a terminal — or let your AI agent drive it.

Try it instantly — no install
Claude Code
mkdir -p ~/.claude/skills/bruno && curl -fsSL https://workflowstacks.com/api/skills/bruno/claude-skill -o ~/.claude/skills/bruno/SKILL.md
Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)
claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

How bruno – Fast, Open‑source IDE for API Exploration & Testing (47k+ GitHub stars) works
Codeflow
Free to inspect

Bruno – Fast, Open‑source IDE for API Exploration & Testing (47k+ GitHub stars) is a very large JavaScript project (~268k lines across 1806 code files, plus 719 test files). It is a full software project: use it through its install path rather than reading it end to end. Last commit this month, MIT license, has a test suite.

Size
Very large codebase
~268k lines · 1806 code files · days to read — use, don't read
Setup
Developer setup
A real software project. Use it via its install path; don't expect to read it all.
Runs on
Node.js
No API keys detected
JavaScript 73%TypeScript 24%Bru 4%
Where to start reading
  1. 1
    readme.md
    Start here — what it does and how to install it
  2. 2
    playwright/index.ts
    Where the program starts running
  3. 3
    package.json
    Dependencies and the commands it exposes
What's in each folder
packages/Sub-packages / plugins2587 files
docs/Documentation52 files
scripts/Helper scripts10 files
playwright/Folder3 files
tests/Tests — proof it works1464 files
.github/CI / automation (GitHub Actions)50 files
.claude/Editor / agent settings24 files
assets/Images & static assets11 files
READMEHas testsDocumentedCI checksMIT licenseUpdated this month
Quick Actions
Details
Creator
usebruno
Language
JavaScript
Category
devtools
Published
9/27/2022

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Featured on WorkflowStacks
[![Featured on WorkflowStacks](https://workflowstacks.com/api/badge/bruno.svg)](https://workflowstacks.com/skills/bruno?utm_source=github&utm_medium=badge)
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Do this with a working workflow

Pages we wrote and tested that put a skill like this to work — importable n8n templates, outcome guides and Claude Desktop configs.

MCP config

Playwright (browser) MCP config

Drive a real browser for testing and automation from Claude.

Outcome guide

Automate your weekly client reports

Keep each client’s metrics in a Google Sheet. Every Monday the workflow reads the week’s numbers, writes a plain-English narrative — what moved, why, and what’s next — and emails it to the client.

MCP config

GitHub MCP config

Search repos, read code, open issues and PRs from Claude.

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