Validating HTTP responses

You can test your API by using Assertions to verify that a certain part of an HTTP response matches your expectations. You can define assertions against the following response characteristics:

• Status code
• Headers
• Body length
• Duration
• Status message
• JSON body (using JSON Path)
• XML body (using Xpath)
• Body content

Assertions are validated in real-time, meaning that they are re-evaluated when you run the request and when you update them.

Assertions leverage operators in order to compare values and check the existence or inclusion of certain values.

For example:

• Status code equals 200
• Duration (ms) less than 200
• Body content exists
• The element located at JSON path $.id in the JSON body equals 12345

Assertions are a solid base to test your API, but you need them to be dynamic. Dynamic assertions allow you to test that the header Content-type of the response is equal to the header Accept of the request for example. You can create dynamic assertions with expressions.