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Thunder Client - Rest API client for VS Code, lightweight Postman alternative
Swagger Inspector - Free online tool to test APIs and autogenerate documentation
Insomnia REST - The most intuitive cross-platform REST API Client ð´
Run in Postman Button - Test public APIs with one click
API Tester - API Tester is the first mobile app to test any type of API on the go. Including REST, GraphQL, WebSocket, SOAP, JSON RPC, XML, HTTP, HTTPS.