Validating Responses in POSTMAN

Testing is a big part of any development cycle. Of the many tools we use, Postman is perhaps one of the lesser-known beasts. Most of us just use the tool to send a request and see the response. There is a rather valuable part of the tool called Test which we will discuss today.

We will start by sending a POST request to {{url}}/user/profile. The {{url}} is my environmental variable which basically allows one to substitute a value to it globally.

We have a response on the right-hand side. The task now is we want to verify whether the keys in the JSON are as we expect them to be. For that, we will need something called a JSON schema. A schema is basically a blueprint of the response. You can relate to this by the “class as a blueprint of the object” example.

To make the schema we will go to https://jsonschema.net/home. Once you are logged in you will get a screen as below. All you have to do is paste your response on the left-hand side of the screen. Now click on submit. You will find a schema generated on the right-hand side.

What this basically means is you will create rules on how the response should be validated. We will get into the details…