
Free fake REST API with products, posts, todos, any HTTP status code and request echo.
TestingAPIs 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.
Documentation for the free testingapis.com fake REST API: 360 endpoints with realistic JSON, test credentials for every auth scheme, pagination, errors and examples.
Details from testingapis.com.

Unified API suite · now live
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Free multi-protocol sandbox: REST, GraphQL & SOAP with OAuth2/JWT auth and OpenAPI 3.0 spec
The TestingAPIs API is provided by testingapis.com (testingapis.com). Documentation for the free testingapis.com fake REST API: 360 endpoints with realistic JSON, test credentials for every auth scheme, pagination, errors and examples.
Yes. The TestingAPIs 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 TestingAPIs API requires no authentication, so you can start making requests without signing up.
Yes. The TestingAPIs API supports CORS, so front-end JavaScript can call it directly.
Yes. The TestingAPIs API is served over HTTPS, so it's safe to use in production.