json is not defined

This error occurs when you use the variable `json` but it has not been defined before.

JSON stands for JavaScript Object Notation, which is a lightweight data interchange format. To use JSON in your JavaScript code, you need to either import the JSON object or define it yourself.

Here's an example of importing the JSON object:

import JSON from 'json'

And here's an example of defining the JSON object:

var JSON = {
  // JSON methods and properties
}

Make sure to define or import the JSON object before using it in your code.