Pre-request Scripts

Prerequisites

Basic HTTP concepts Knowledge of REST API...

What is the scripting in Postman?

Scripts are the pieces of code that can be executed at a specific point of time in the Postman testing environment. There are two types of scripts –...

Languages Supported?

Postman’s runtime is based on Node JS and lets you add dynamic behavior to requests and collections. You can use pre-request and test scripts in various languages like Javascript/NodeJS. Postman provides JavaScript APIs that you can use in your request scripts. The pm object provides functionality for testing your request and response data, with the postman object providing additional workflow control....

Use of scripting languages

1. Automated Testing: Postman enables you to write check scripts that execute after sending an API request. JavaScript, being the primary scripting language supported through Postman, enables the creation of computerized checks to affirm API responses, data integrity, and server conduct....

Execution order of Scripts

The sequence is Pre-request Script, Request, and then Tests. This order ensures that any necessary modifications to the request are made before it is sent, and validations are performed after receiving the response....

Post-Request Scripts

In postman, we can write test scripts to test API requests in Javascript. These are called Post-request scripts. Test script is used to test whether your API is working accordingly or not, to establish that integrations between the services are functioning properly, and to check that new developments have not affected any functionality of existing requests....

Steps to Execute Post-Request Scripts in Postman:

Step 1: After downloading and installing the Postman, open the software. Add a new Collection and give it a name like “GFG”. Here, we can see, multiple tabs like Authorization, Pre-request scripts, Tests , Variables....

Pre-request Scripts:

A pre-request script associated with a request will execute before the request is sent. You can write pre-request scripts for your Postman API requests in JavaScript. The Pre request tab allows for any pre- request processing before a request is sent....

Steps to use Javascript with pre-request scripts

Step 1: After downloading and installing the Postman, open the software. Add a new Collection and give it a name like “GFG”. Here, we can see, multiple tabs like Authorization, Pre-request scripts, Tests , Variables....