About justmocks

A free, public catalog of mock APIs for the third-party services developers integrate against. No signup, no setup, no SDK. Just a URL.

What it is

justmocks is a catalog of hosted mock APIs. Each entry is generated from a provider's published OpenAPI specification and served by the mockzilla engine. Responses match the spec field-for-field: correct schemas, correct status codes, correct content types.

You hit https://api.justmocks.com/<slug>/<endpoint> and get back a realistic response. No accounts. No keys. No setup.

What it is not

justmocks is not a sandbox of the real provider. It does not move money, talk to banks, send messages, or trigger webhooks. The responses are synthetic, generated from the spec, and intended for use during early-stage integration work where you need to know the shape of a response without actually exchanging anything with the provider.

How it relates to mockzilla

mockzilla is an open-source mock server. You point it at an OpenAPI spec and it returns realistic responses for every endpoint defined in that spec. It runs anywhere a binary or Docker container runs.

mockzilla.org is the hosted version. You push your own OpenAPI spec to GitHub, add the mockzilla Action to your workflow, and get a dedicated simulation URL in seconds. PR environments, multi-region deployment, rate-limit headers, optional API keys. The free tier covers one repo and ten thousand requests a month, no credit card required.

justmocks is what you are reading now: the public, search-indexed catalog of pre-built mocks for popular third-party services, running on the same mockzilla engine.

Use cases

• Early integration work when you have not signed up for the real provider's sandbox yet.
• UI prototyping against a realistic API surface, without writing fixtures by hand.
• Demos and screencasts where you need responses that look real but cannot involve a real account.
• CI smoke tests for code that integrates with a third party, when the real sandbox is rate-limited or flaky.

Requesting a new mock

If the provider you want publishes an OpenAPI spec, we can add it. Email info@justmocks.com with the spec URL, or use the contact form on mockzilla.org.

Trademarks & removal

Every mock listed here is generated from documentation the provider has published openly. Logos and names belong to their respective owners. If you represent a provider and want your service removed, see the removal page.