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Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
GoReplay is an open-source tool for capturing and replaying live HTTP traffic into a test environment in order to continuously test your system with real data. It can be used to increase confidence in code deployments, configuration changes and infrastructure changes.
Hurl, run and test HTTP requests with plain text.
HTTP Request & Response Service, written in Python + Flask.
Record, Replay, and Stub HTTP Interactions.
The complete load testing platform. Everything you need for production-grade load tests. Serverless & distributed. Load test with Playwright. Load test HTTP APIs, GraphQL, WebSocket, and more. Use any Node.js module.
MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.
The interactive web server
HTTP(S) benchmark tools, testing/debugging, & restAPI (RESTful)
Automatically mock your HTTP interactions to simplify and speed up testing
End-to-end HTTP and REST API testing for Go.
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
Generate custom HTTP responses, the simpler way to test your Web Services
Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.
Record and replay your HTTP interactions for fast, deterministic and accurate tests
An Extensible Request/Response Workbench
Bypass provides a quick way to create a custom plug that can be put in place instead of an actual HTTP server to return prebaked responses to client requests.
A reasonably complete and well-tested golang port of httpbin, with zero dependencies outside the go stdlib.
Mock HTTPX with awesome request patterns and response side effects 🦋
:rocket: Modern cross-platform HTTP load-testing tool written in Go
Expressive end-to-end HTTP API testing made easy in Go
Fast, native API client for REST, gRPC, WebSocket and GraphQL. A local-first Postman alternative written in Go: no Electron, no account, no cloud.
🔭 Powerful tool for testing WebHooks and more