loading the JSON and loading the window) are racing to completion, and if the JSON isn’t loaded fast enough, the window.onload method will attempt to parse the JSON string that isn’t loaded yet.įix – Synta圎rror: Unexpected token u in JSON at position 0īased on the issues stated above, there are different solutions for each root cause. Race Condition – It happens because your two asynchronous operations (i.e.If the response returned by the API is not a valid JSON, For Ex – attempting to parse an Object.If we are fetching the data from an external source, it may return empty or undefined.If we try to access a property that does not exist in the JSON.There are multiple other reasons for the Unexpected token u in JSON at position 0 error when we call JSON.parse() Hence the error message outputs as Unexpected token u in JSON at position 0. Here the undefined gets converted to a string, and the string’s first character starts with the letter ‘u’ and is in the position 0. The JSON.parse() method attempts to parse undefined as JSON since the parsing fails, it will throw a Synta圎rror. JSON.parse(undefined)īelow would be the output when you run the above code Synta圎rror: Unexpected token u in JSON at position 0 Let us take a simple example to reproduce this issue in your terminal or console. What is Synta圎rror: Unexpected token u in JSON at position 0? We can resolve the error by ensuring that the object we pass to JSON.parse() is a valid JSON string. The Unexpected token u in JSON at position 0 mainly occurs if we pass an undefined value to JSON.parse() method or $.parseJSON() method. Converting circular structure to JSON Exception in JavaScript
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