Give LLMs API specs and ask to write you API tests
06 Nov 2025
There is Cursor agentic IDE screen that shows agent converting json specs into API tests.
For a while, I had a few collections of API tests in Postman while I was exploring our API a while ago. We aren't planning to use Postman for API automation and I thought what if I speed up API test automation by giving my agent json specs (claude-4-sonnet in Cursor) and ask to convert those specs into API tests.
Beforehand, I have asked agent to read and run already existing API tests and asked it to follow the pattern, coding standards that are already established in the repo. In this way, I can keep consistency and should take less time to review vibed tests to align with existing.
What I have realised is I didn't ask my agent to not generate tests for endpoints that already exist, so I will need to review those to make sure there aren't duplicates. Something to keep in mind for next time.
Beforehand, I have asked agent to read and run already existing API tests and asked it to follow the pattern, coding standards that are already established in the repo. In this way, I can keep consistency and should take less time to review vibed tests to align with existing.
What I have realised is I didn't ask my agent to not generate tests for endpoints that already exist, so I will need to review those to make sure there aren't duplicates. Something to keep in mind for next time.
Nataliia Burmei
Lead Quality Engineer
I am Nat, Lead Quality Engineer who loves travelling, running, quality coffee with a book on the side. Totally unbiased, I love quality.
Simon Tomes
Great use of an agent! Thanks for sharing.
Danny Dainton
Postman will allow you to do this to, all inside the platform with Agent Mode ♥️
https://www.postman.com/product/agent-mode/
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