Postman
postman.comAPIs
The default place to build, test, and share API requests — everyone's used it, and for good reason.
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A cleaner, faster API client than Postman if you don't need the enterprise bloat.
Open-source, runs in a browser tab, and loads instantly — great when you just need to fire a request.
The OpenAPI tooling everyone standardized on for writing specs that double as live docs.
Design, mock, test, and document your API in one tool instead of stitching together five.