The Postman API Builder isn’t supported in Postman v12 and later. Learn about using the API Builder in Postman v11 and earlier.
The Postman API Builder was Postman’s API design and governance tool. Postman’s Spec Hub has replaced the API Builder as the recommended tool for managing API specifications in Postman. With Spec Hub, you can design APIs in many supported formats, identify governance issues, preview live documentation changes, and much more. You can also generate collections and keep them in sync with your API specifications.
Learn how to migrate your API specifications from the API Builder to Spec Hub.