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Free multi-protocol sandbox: REST, GraphQL & SOAP with OAuth2/JWT auth and OpenAPI 3.0 spec.
TotalShiftLeft Sandbox API is a free Test Data API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free public APIs for developers and QA. Live REST, GraphQL, SOAP, Swagger UI and OAuth2 / JWT auth — no signup, no API key. JSONPlaceholder / ReqRes alternative.
Details from demo.totalshiftleft.ai.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Generate random testimonial data
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The TotalShiftLeft Sandbox API is provided by TotalShiftLeft (demo.totalshiftleft.ai). Free public APIs for developers and QA. Live REST, GraphQL, SOAP, Swagger UI and OAuth2 / JWT auth — no signup, no API key. JSONPlaceholder / ReqRes alternative.
Yes. The TotalShiftLeft Sandbox API is listed in the Test Data category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The TotalShiftLeft Sandbox API requires no authentication, so you can start making requests without signing up.
Yes. The TotalShiftLeft Sandbox API supports CORS, so front-end JavaScript can call it directly.
Yes. The TotalShiftLeft Sandbox API is served over HTTPS, so it's safe to use in production.