how to send undefined value in postman?-CodePudding

Is there a way to send something like this in postman?

{
 "a": [undefined, {"b":"ball", "c":"cat"}]
}

Postman gives a red underline under undefined. If I use the pre-request script to pm.variables.set('undefinedVariable', undefined); and use this, then my code is giving this error

{
    "statusCode": 400,
    "error": "Bad Request",
    "message": "Invalid request payload JSON format"
}

CodePudding user response：

It has nothing to do with node.js nor postman. undefined is not a valid json value even though it is valid in javascript. You may be able to use null instead

https://stackoverflow.com/a/14946821/6785908

undefined is not a valid JSON value, even though it is valid in javascript.

From the official JSON standard (ECMA-404, Section 5):

A JSON value can be an object, array, number, string, true, false, or null.

CodePudding user response：

You need to define null in place of undefined as JSON doesn't handle undefined keyword. Example: { "a": [null, {"b":"ball", "c":"cat"}] }