Uncaught (in promise) SyntaxError: Unexpected end of JSON input

Question

I am trying to send a new push subscription to my server but am encountering an error \"Uncaught (in promise) SyntaxError: Unexpected end of JSON input\" and the console say

Answer 1

This might be a problem with the endpoint not passing the appropriate parameters in the response's header.

In Chrome's console, inside the Network tab, check the headers sent by the endpoint and it should contain this: Example of proper response to allow requests from localhost and cross domains requests

Ask the API developer to include this in the headers:

"Access-Control-Allow-Origin" : "*", 
"Access-Control-Allow-Credentials" : true