Error when unit testing: “Uncaught (in promise) SyntaxError: Unexpected token o in JSON at position 1”

Question

I\'d like to unit test a service, however, when running the test, I get the following error:

Uncaught (in promise) SyntaxError: Unexpected token o in

Answer 1

SyntaxError: Unexpected token o in JSON at position 1

Reasons as per the error :

• May be you are expecting Content-Type as JSON as a response from the API but you are getting response as a String start with alphabet o. Hence, It throws an error that Unexpected token o in JSON at position 1.
• If the response header is text/html you need to parse, and if the response header is application/json it is already parsed for you.If you parse it again it will give you unexpected token o.

If response is already a JSON Object then no need to use response.json().