How To Fix Unexpected token u in JSON at position 0?

When we deal with JSON data, sometimes we may find that JSON. And we need to fix it or change it just a bit, but to find out there are so many articles about how to solve unexpected token u in JSON at position 0, I was confused at first. But I tried some of them and they were all failures. However, I improved my knowledge and fixed it finally. Check the code below:

Unexpected token a in JSON at position

on Jan 01, 1970
JSON.parse(JSON.stringify(userData))

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Uncaught (in promise) SyntaxError: Unexpected token O in JSON at position 0

on Jan 01, 1970
var stringified = JSON.stringify(data);
var parsedObj = JSON.parse(stringified);
 
console.log(parsedObj);

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Unexpected token W in JSON at position 0

on Jan 01, 1970
Unexpected token W in JSON at position 0

It's because a simple string (plain text) is returned as the response. The text is not a valid JSON. So when you try to do res.json(), it calls JSON.parse(data). Try and do it with the string you provided, and you will get the same error.

use res.text() instead of res.json()

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fetch SyntaxError: Unexpected token

on Jan 01, 1970
JSON.parse(theStringThatIsNotJson);

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syntaxerror: unexpected token f in json at position 0

on Jan 01, 1970
Check out JSON syntax. https://jsonlint.com/

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unexpected token

on Jan 01, 1970
try from other device.

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Here's the thing: The biggest single cause of this error is having a quote within a string. Therefore you can fix it by removing the quote.

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