Design & Build

Mock Servers

Don't let APIs you don't own slow you down. Write stateful mocks in code, then deploy them as stable mock servers your teams and pipelines can depend on.

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Write the behavior in code, Postman runs it as a stable server

Start from what you have

Create a mock from a specification or a collection, or point Postman AI at your codebase to write one.

Code in your repo

Each mock is a JavaScript file of request handlers in your repo, so it behaves as a real service.

Your team's own URL

Deploy to a URL on your team's subdomain, and it stays the same even with mock updates.

State per session

Data persists between requests, and each session gets its own copy, so parallel runs stay clean.

Turn your API context into a working mock with AI

Postman AI can write and update mock code using your spec, collection, or codebase as context. Describe the behavior you want and it generates a working mock.

Postman showing Auth Service Mock with its endpoints beside the JavaScript that validates a login request, and a log confirming the mock server started
Ask Postman AI

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Quote
Mock servers removed development dependencies. Postman allows API development, testing and releases to be run in parallel. There's no waiting for API implementation to be completed."
Eduardo Iriarte-Mendez, Senior Software Engineer, Flix

Talk to a Postman expert

See where API dependencies block your teams, and how to standardize programmable mocks across local development, CI, and shared testing.

Screenshot of a Postman demo video about mocks