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Dynamically Modify Query, Body, and Header Parameters Before Sending

In the document "Pre-request Script", we learned that the main functions of pre-request scripts are:

  • Writing JS functions to achieve complex calculations;
  • Printing variables;
  • Defining, retrieving, deleting, and clearing environment variables;
  • Defining, retrieving, deleting, and clearing global variables;
  • Retrieving request parameters;
  • Dynamically adding or deleting a header request parameter;
  • Dynamically adding or deleting a query request parameter;
  • Dynamically adding or deleting a body request parameter;
  • Sending HTTP requests.

Using this feature, we can dynamically add or modify request parameters before sending.

Usage Scenarios​

Suitable for situations where request parameters need to be dynamically changed before sending. For example, when sending a request, a token needs to be calculated through other request parameters and added to the corresponding sending parameters.

Script Syntax​

pm.setRequestQuery("key", "value"); // Add or modify a query parameter in the URL
pm.removeRequestQuery("key"); // Delete a specified query parameter in the URL
pm.setRequestHeader("key", "value"); // Add or modify a request header key
pm.removeRequestHeader("key"); // Delete a request header key
pm.setRequestBody("key", "value"); // Add or modify a body parameter
pm.removeRequestBody("key"); // Delete a body parameter key
pm.setRequestBody(
    { 
        "key": "value" 
    }
); // Reset the body parameters "entirely" to {"key": "value"}, suitable for cases where the original request body is of raw type