What programs for testing APIs have you used?

The following programs and tools are often used for API testing:

• Postman — a user-friendly graphical interface for manual testing of REST APIs, allows creating request collections and automating tests with scripts.
• SoapUI — suitable for testing SOAP and REST services, supports functional, load, and security testing.
• Insomnia — a lightweight and convenient client for HTTP requests with support for GraphQL.
• JMeter — a load testing tool that can be used for APIs.
• RestAssured — a Java library for automating REST API testing.

Example of using Postman for a GET request:

GET https://api.example.com/users/123
Authorization: Bearer <token>

In Postman, you can check the response, status code, headers, and response body.