MockBolt

MockBolt is a free, anonymous mock API builder for developers. It turns any JSON payload into a live, public API endpoint in seconds — with zero signup, zero install, and zero configuration. Linke: https://www.mockbolt.com Here's how it works: paste your JSON into the built-in editor, select which HTTP methods the endpoint should accept, optionally set a custom HTTP status code (any code from 100 to 599), add a response delay to simulate slow or flaky APIs, or inject custom response headers for any scenario you need to test. Hit Generate — and you immediately get a live public URL with open CORS. That public URL works from any browser, any frontend framework (React, Vue, Angular, Svelte), any mobile app (React Native, Flutter), any API client (Postman, Insomnia, curl), or any backend service — no proxy, no configuration, no CORS errors. Use MockBolt when: - Your backend team hasn't built the endpoint yet and you want to start on the UI - You need to test how your app handles 500 errors, timeouts, or 404s - You're building a demo or prototype and don't want to spin up infrastructure - You're running a workshop or coding tutorial and need to give students a live API immediately - You need to test a Postman collection against a predictable response Free endpoints are public and expire after 24 hours. You get a management URL to edit your mock anytime without creating an account. No email, no identity, no credit card — ever.