A response can contain valid JSON and still be unsuitable for an analytics event. Parsing only answers whether the text follows JSON syntax. It does not confirm that the message contains the fields, types or meanings your measurement needs.
Identify the representation before changing it
JSON is a text format. A JavaScript object is a value available to running code. They can look similar in a console, but require different operations. JSON.parse() converts JSON text into a JavaScript value. JSON.stringify() converts a supported value into JSON text. Neither operation sends data anywhere by itself.
Check what the integration actually supplies. A helper may already return a parsed object. A response body or stored value may instead be a string. Do not parse again merely because the data originally travelled as JSON. Serialising an existing JSON string adds another string layer, rather than turning it into an object.
Separate syntax errors from contract failures
JSON requires double quotes around property names and string values. It does not allow comments or trailing commas. A JavaScript object literal can use syntax that JSON rejects. JSON.parse() throws a SyntaxError when the text does not follow JSON syntax. Fix the producer or the agreed format rather than deleting characters until parsing succeeds.
Successful parsing can return an object, array, string, number, Boolean or null. A valid response containing null has passed the parser but cannot supply an export format. A response with success as a string has a different meaning from the required Boolean. Validate the resulting value separately.
