Mockaron is a free online tool for creating mock APIs with customizable JSON responses, enhancing front-end development, testing, and prototyping.

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Front-end developers and testers can use Mockaron to build and exercise an API-dependent interface before a backend is ready, or to test against predictable responses without using live data. Its visual, no-code editor lets you create REST endpoints and define responses, with a preview as you work. Create JSON responses with nested objects, arrays, and generated values, or serve HTML, XML, and plain text. Configure HTTP methods, status codes, headers, and response delays to test different outcomes and loading states. Request-matching rules can use the URL, method, headers, query parameters, or body—including wildcards and regular expressions—to return different responses for different inputs. Mockaron also supports protected routes with JWT, API key, or basic authentication, and placeholder image URLs for prototypes and demos.

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