Requestly

Requestly is an open-source browser extension that provides tools for manipulating network requests and debugging APIs. It functions as a browser extension and a desktop application available for macOS, Windows, and Linux, allowing developers to intercept and modify HTTP traffic. The software serves as a playground for testing REST and GraphQL endpoints, enabling users to build and sync APIs according to their specific workflow requirements.

It is designed for developers who need to manage API collections without mandatory cloud accounts or login requirements. By supporting local storage and self-hosted deployments, the software ensures that sensitive API data remains under the control of the user. This makes it a suitable choice for teams requiring strict data sovereignty or individuals who prefer to avoid cloud lock-in while managing their development environments.

Key features

• REST API playground for saving and testing endpoints
• Pre and post scripts to adjust requests and process responses
• Import and export support for cURL and OpenAPI
• GraphQL testing with schema introspection and auto-completion
• Git sync for collaborating on API collections via repositories
• Local workspaces that store data in secure local files
• HTTP interception via browser extensions for Chrome, Firefox, and Edge

The broader ecosystem includes a dedicated HTTP Interceptor for browser-based request manipulation and a desktop proxy for system-wide traffic control. To support automated testing, the software provides integrations with frameworks such as Cypress, Selenium, and Playwright. The architecture emphasizes a privacy-first approach, offering a flexible choice between local-only work, team synchronization through Git, or full on-prem deployment for enterprise governance.

Requestly is a lightweight, developer-centric tool for API testing and network debugging that prioritizes data ownership over cloud-based storage.