Hoppscotch Has a Free Open-Source API Development Platform

Hoppscotch is a free, open-source API development ecosystem. It's a lightweight, fast alternative to Postman that runs in your browser.

What Is Hoppscotch?

Hoppscotch is an API client for testing REST, GraphQL, WebSocket, SSE, Socket.IO, and MQTT APIs. It's fast, beautiful, and works entirely in the browser.

Key features:

• REST, GraphQL, WebSocket, SSE, Socket.IO, MQTT
• Collections and environments
• Team collaboration
• Request history
• Pre-request scripts
• Tests and assertions
• Code generation (20+ languages)
• Import from Postman, OpenAPI, cURL
• Self-hostable or use hoppscotch.io
• PWA (install as desktop app)

Quick Start

Just open hoppscotch.io — no signup needed.

Or self-host:

git clone https://github.com/hoppscotch/hoppscotch
cd hoppscotch
docker compose up -d

REST API Testing

1. Enter URL: https://api.github.com/users/torvalds
2. Click Send
3. See formatted response instantly

Add headers, query params, body — everything in a clean UI.

GraphQL

Built-in GraphQL client with:

• Schema auto-completion
• Query variables
• Headers management
• Response formatting

query {
  user(login: "torvalds") {
    name
    repositories(first: 5, orderBy: {field: STARGAZERS, direction: DESC}) {
      nodes {
        name
        stargazerCount
      }
    }
  }
}

Real-Time Testing

WebSocket

Connect to wss://echo.websocket.org and send messages in real-time.

Server-Sent Events (SSE)

Listen to event streams with formatted output.

Socket.IO

Connect and emit/listen to events.

MQTT

Publish and subscribe to MQTT topics.

Hoppscotch vs Postman

Feature	Postman Free	Hoppscotch
Speed	Heavy (Electron)	Instant (browser)
Size	500MB+	0 (web app)
Collections	100 per workspace	Unlimited
Team members	3	Unlimited (self-host)
GraphQL	Yes	Yes
WebSocket	Yes	Yes
SSE/MQTT	No	Yes
Self-host	No	Yes
Open source	No	Yes
Offline mode	Yes	PWA

Code Generation

Hoppscotch generates code in 20+ languages:

• JavaScript (fetch, axios)
• Python (requests, http.client)
• cURL
• Go, Ruby, PHP, Java, C#
• And more

Test your API → click "Code" → copy to your project.

Collections

Organize requests into collections:

• Folders and sub-folders
• Environment variables
• Share with team
• Export/import

CLI

npx @hoppscotch/cli run collection.json --env environment.json

Run collections in CI/CD pipelines.

Who Uses Hoppscotch?

With 66K+ GitHub stars:

• Developers testing APIs daily
• Teams wanting Postman alternative
• Frontend developers debugging backends
• Companies needing self-hosted API tools

Get Started

1. Open hoppscotch.io (instant, no install)
2. Enter your API URL
3. Test REST, GraphQL, WebSocket — all in one place

Fastest API client you'll ever use.

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