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On this page
  • Configure Pre-request Script
  • Setting Up the Pre-request Script
  • Example Pre-request Script
  • Saving Your Configuration
  • Usage Notes

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  1. API Security Testing
  2. How To

Configure Pre-request Script

PreviousRescan Specific Issues ResolvedNextSet Up JSON Recording for Auth Tokens

Last updated 8 months ago

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Configure Pre-request Script

The Pre-request script feature in Akto allows you to execute custom JavaScript code before each API test is run. This powerful functionality enables you to dynamically modify request parameters or perform any necessary pre-test operations.

Setting Up the Pre-request Script

  1. In the text area labeled "Enter pre-request javascript here...", input your JavaScript code.

  2. The script has access to several predefined variables:

    • method: The HTTP method of the request (e.g., GET, POST)

    • headers: The headers of the request

    • url: The URL of the request

    • payload: The body of the request

    • queryParams: The query parameters of the request

  3. Write your custom logic using these variables and any additional JavaScript you need.

Example Pre-request Script

Here's an example of a pre-request script that modifies the payload and method of a request:

var method;
var headers;
var url;
var payload;
var queryParams;

function modifyRequestPayload() {
    payload = "test payload"
    method = "POST";
}

modifyRequestPayload();

This script sets the payload to "test payload" and changes the method to "POST" for every request.

Saving Your Configuration

After entering your pre-request script, click the "Save" button at the bottom right of the page to apply your changes.

Usage Notes

  • The pre-request script runs before every API test in your Akto environment.

  • You can use this feature to:

    • Add authentication tokens dynamically

    • Modify request data based on external factors

    • Implement custom logic that needs to run before each test

  • Be cautious when modifying core request properties, as it may affect the intended behaviour of your tests.

  • For complex operations, consider breaking your code into functions for better readability and maintenance.

By effectively using the Pre-request script feature, you can enhance the flexibility and power of your API testing process in Akto.