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- Swagger UI is an interactive web page that displays your REST API and lets you call it directly from the browser.
- It is used so that developers and testers can explore endpoints, send real requests and see real responses without Postman.
- It reads the OpenAPI document (
/v3/api-docs) and builds a clickable page from it automatically.
- In Spring Boot, the springdoc library serves Swagger UI at
/swagger-ui.html with no extra code.
Features
- Lists all endpoints, grouped by tag, with their methods and URLs.
- Try it out button sends a real request to your running application.
- Pre-filled request bodies, with a dropdown of example payloads.
- Shows the response body, status code, headers and a ready-made
curl command.
- Displays the data model (schema) of each request and response.
- Needs no separate tool or installation.
