What Is Pre Request Script In Postman

geekerhub

Updated on:

what is pre request script in postman

Postman, a widely used API development and testing tool, offers a powerful feature called pre-request scripts, which empowers developers and testers to automate requests and streamline their API testing workflows. In Postman, what is pre request script in postman in this pre-request script is a piece of JavaScript code that is executed before sending a request to an API endpoint.

In this blog post, we will explore the concept of pre-request scripts in Postman, their significance, and provide a practical code example to illustrate their usage.

API testing often involves repetitive tasks such as setting headers, handling authentication, and manipulating request data. Pre-request scripts in Postman provide a solution to automate these tasks by allowing developers to run custom code before sending API requests. This capability opens up a world of possibilities for enhancing automation, dynamic parameterization, and request customization.

To showcase the power of pre-request scripts, let’s consider a common use case where we need to include an authentication token in the request header.

Set up the Pre-request Script in Postman

// Pre-request script example in Postman

pm.sendRequest({
    url: 'https://api.example.com/auth',
    method: 'POST',
    body: {
        mode: 'raw',
        raw: JSON.stringify({
            username: 'your_username',
            password: 'your_password'
        })
    }
}, function (err, response) {
    if (err) {
        console.error(err);
        return;
    }

    var token = response.json().token;

    // Set the token in the request header
    pm.request.headers.add({
        key: 'Authorization',
        value: 'Bearer ' + token
    });
});

By leveraging pre-request scripts, developers can automate various tasks, such as fetching dynamic values from external sources, manipulating request payloads, or configuring request headers based on environmental variables. This not only saves time but also improves the efficiency and accuracy of API testing.

PHP/cURL Code to Retrieve and Display Data

Now, let’s see how we can retrieve and display the data in PHP using cURL. Assuming you have PHP installed, create a new PHP file (e.g., retrieve_data.php) and add the following code:

<?php

$apiEndpoint = 'https://api.example.com/data'; // The API endpoint to retrieve data

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $apiEndpoint);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Authorization: Bearer {your_token}' // Replace {your_token} with the actual token value
));

$response = curl_exec($ch);
curl_close($ch);

// Display the retrieved data
echo $response;
?>

Make sure to replace {your_token} in the PHP code with the actual token value obtained from the Pre-request Script in Postman.

By running the PHP script, you should be able to retrieve and display the data from the API endpoint, authenticated using the token set in the pre-request script.

Relative Blogs : Understanding The Upgrade-Insecure-Requests HTTP Header

26 thoughts on “What Is Pre Request Script In Postman”

  1. Ace of Base — шведская поп-группа, образованная в 1990 году. Их музыкальный стиль сочетает в себе элементы поп-музыки, дэнса и электроники. Группа стала популярной благодаря хитам “All That She Wants”, “The Sign”, “Don’t Turn Around” и “Beautiful Life”. Эти композиции не только покорили чарты во многих странах мира, но и остаются классикой жанра до сих пор. Ace of Base оставили неизгладимый след в истории поп-музыки, их мелодии до сих пор радуют слушателей по всему миру. Скачать музыку 2024 года и слушать онлайн бесплатно mp3.

  2. CellSpy mobile phone monitoring software is a very safe and complete tool, it is the best choice for effective monitoring of mobile phones. App can monitor various types of messages, such as SMS, email, and instant messaging chat applications such as Snapchat, Facebook, Viber, and Skype. You can view all the contents of the target device: GPS location, photos, videos and browsing history, keyboard input, etc.

Leave a Comment