ReqBin is an online API testing tool for REST and SOAP APIs.See the tool
Description
Test API endpoints by making API requests directly from your browser. Test API responses with built-in JSON and XML validators. Load test your API with hundreds of simulated concurrent connections. Generate code snippets for API automation testing frameworks.
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Thunder Client is a lightweight Rest API Client Extension for Visual Studio Code
Snapshot-based stub/mocking of APIs.
GUI client for gRPC/gRPC-Web