API / Swagger Interview questions
What is the difference between Swagger and Postman?
Both tools are commonly used around REST APIs, but they solve different core problems: Swagger/OpenAPI is fundamentally a specification format and documentation-generation toolset, while Postman is primarily an API client and manual/automated testing tool.
| Swagger / OpenAPI | Postman |
| A specification format plus tools to document and generate code from it. | A GUI application for manually building and sending API requests. |
| Primary output: interactive docs, generated clients/servers. | Primary output: saved request collections, test scripts, environments. |
| Definition typically version-controlled alongside application code. | Collections can be exported/imported, often managed more ad hoc. |
| Best fit: describing and generating from an API's formal contract. | Best fit: exploratory testing and building automated test suites. |
In practice the two complement rather than compete: Postman can import an OpenAPI document directly to auto-generate a request collection, so a well-maintained Swagger/OpenAPI spec often becomes the starting point for a team's Postman-based testing workflow rather than the two being maintained as entirely separate, disconnected artifacts.
What is Postman primarily used for?
Can Postman import an OpenAPI document?
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