Creating Postman Scripts

In this post, we will be creating Postman scripts to get/set variables and make API requests using Postman scripts.

Get access to variables

Postman allows you to get access to the variables that you have created within the scripts. Let’s take a look at an example for that –

pm.variables.get("variable_key");

You can even access variables that were created outside the request level scope i.e global, environment, collection level, etc.

Set variables using Scripts

Not only you can get access to variables, but you can also set variables within the pre-request or the test script. Let’s take a look at an example for that –

pm.collectionVariables.set("variable_key", "variable_value");

Depending on the scope set for the variable, you can access it accordingly.

Making API request in the Pre-request script

Using the pre-request script, you can make an API request to get the data you need from the response and pass that along to your request dynamically. Let’s take a look at an example for that –

pm.sendRequest(`${baseUrl}/users`, function (err, response) {
    pm.variables.set('user_id', response.json()[0].id)
});

In the above example, I am making a call to the /users API to fetch all the users and get the id for the first user and set it to the user_id variable. This variable can then be passed to the request instead of hard-coding the user id each time.

Check out the video below to learn more about Postman Scripts –

To learn about API Test Automation using JavaScript, check out my free tutorial series here –

JavaScript API Test Automation Tutorial Series

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