Hoppscotch
Lightweight, open-source API development tool in the browser.
Open the official app on hoppscotch.io
This tool is hosted by its maintainers. Click below to open hoppscotch.io in a new tab — it's their official demo.
Browse developer tools →What's next with Hoppscotch?
Choose how you want to get started.
Use it free
Open the official tool or demo — no account needed.
Self-host it
Run the open-source version on your own infrastructure.
What is Hoppscotch?
Hoppscotch is an open-source API development ecosystem designed to streamline the creation, testing, and documentation of APIs. It serves as an alternative to commercial tools like Postman and Insomnia, offering developers a flexible platform for prototyping and debugging API interactions. The tool supports web, desktop, and command-line interfaces, with options for cloud-based, on-premises, or offline use. It caters to developers, DevOps teams, and API designers who need to rapidly iterate on API endpoints, validate request/response workflows, and share specifications without relying on proprietary software. By providing a unified environment for API development, Hoppscotch reduces the time spent on manual testing and documentation, enabling teams to focus on core application logic and integration challenges.
How it works
Hoppscotch is a comprehensive API development tool that combines API testing, mocking, and documentation into a single platform. It allows developers to craft HTTP requests, simulate server responses, and generate API documentation automatically, all within a user-friendly interface. The tool is particularly useful for developers who need to test APIs before backend implementation, validate third-party integrations, or collaborate with frontend teams. Its open-source nature enables customization for specific project needs, while its cross-platform availability ensures accessibility across different workflows. Hoppscotch supports full HTTP request customization, including headers, parameters, and body payloads. It includes an API mocking feature that lets users simulate endpoints with predefined responses, ideal for frontend development or prototyping. The tool also integrates with cloud services and offers self-hosting options for enterprise use.
How to use it
- 1Download the Hoppscotch client for your operating system or access the web interface. 2. Create a new request by specifying the HTTP method (GET, POST, etc.) and target URL. 3. Configure request parameters, headers, and body data using the built-in form fields. 4. Execute the request and view the raw response or parsed JSON output. 5. Use the mock feature to simulate server responses for endpoints not yet implemented. Practical tips: Leverage the 'Save as Template' feature to reuse requests across projects. For team collaboration, export API specs to OpenAPI format and share them via version-controlled repositories. When self-hosting, configure the server via Docker or CLI for secure internal use.
What it can do
- api development
Use cases
Assumptions and limitations
Assumptions
- source: https://github.com/hoppscotch/hoppscotch
- license: MIT — free to use
- privacy: Opens an external demo
Limitations
- Limited advanced scripting capabilities compared to commercial tools like Postman
- Mocking features require manual configuration of response templates
- Self-hosting requires technical expertise for Docker or CLI setup
- Offline mode lacks real-time collaboration features
- Limited built-in support for complex authentication workflows
Understanding the result
Lightweight, open-source API development tool in the browser.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by (MIT).
- Built with
- (hoppscotch/hoppscotch)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Query
- Output
- Text
Built with hoppscotch/hoppscotch. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- / — GitHub Repository
Upstream project · GitHub
- MIT License
Upstream project
Frequently asked
What types of APIs can Hoppscotch handle?
Hoppscotch supports all standard HTTP-based APIs, including REST, GraphQL, and SOAP. It provides tools for testing CRUD operations, authentication flows, and file uploads. The platform's mock feature allows developers to simulate any endpoint behavior, making it suitable for both public APIs and internal microservices.
How does Hoppscotch's open-source model benefit users?
The open-source license allows developers to customize the tool for specific workflows, integrate it with existing CI/CD pipelines, and contribute to its feature set. This model ensures transparency in code operations and enables organizations to deploy Hoppscotch in environments where proprietary software is restricted, such as government or enterprise systems.
How do I create a mock API endpoint with Hoppscotch?
Navigate to the 'Mock' tab in the interface, define the request method and URL pattern, then configure response parameters. For example, set a GET request to '/api/data' to return a static JSON payload. Save the mock configuration, and the tool will automatically route requests to the simulated endpoint until the mock is deactivated.
How does Hoppscotch compare to Postman or Insomnia?
Hoppscotch offers similar core functionality to Postman and Insomnia but with a stronger focus on open-source flexibility and self-hosting options. Unlike Postman's proprietary cloud model, Hoppscotch provides full offline capabilities and Docker-based deployment. It lacks some advanced automation features in Insomnia but compensates with its integrated documentation generation and mock server tools.
What should I do if my request fails with a '404 Not Found' error?
First, verify the endpoint URL matches the target API's base path. Check for typos in the request method (GET/POST) and ensure the server is running. If using the mock feature, confirm the mock configuration matches the request parameters. For external APIs, validate the service is operational and your network allows outbound connections to the host domain.