How to extract error code from a JSON error message

You can parse the error message to an object and then select the errorCode:

const errorMessage = "{\"errorCode\":\"2029\",\"errorMessage\":\"Duplicate Entry\"}"; const errorMessageObject = JSON.parse(errorMessage); const errorCode = errorMessageObject.errorCode; console.log(errorCode)

This is a JSON encoded object. In order to access the properties of the encoded object, you need to json decode it first. You can use JSON.parse(). Then you can get its properties simply by property name.
Eg:

let encodedString = "{\"errorCode\":\"2029\",\"errorMessage\":\"Duplicate Entry\"}"; let decodedObj = JSON.parse(encodedString); console.log(decodedObj.errorCode); // prints "2029" 

You can use parseInt() to extract the error code as a number rather than a string. Eg:

console.log(parseInt(decodedData.errorCode)); // prints 2029