“SyntaxError: Unexpected token < in JSON at position 0”

Question

In a React app component which handles Facebook-like content feeds, I am running into an error:

Feed.js:94 undefined \"parsererror\" \"SyntaxError: Un

Answer 1

For some, this may help you guys: I had a similar experience with Wordpress REST API. I even used Postman to check if I had the correct routes or endpoint. I later found out that I accidentally put an "echo" inside my script - hooks:

Debug & check your console

Cause of the error

So basically, this means that I printed a value that isn't JSON that is mixed with the script that causes AJAX error - "SyntaxError: Unexpected token r in JSON at position 0"