We can fix the error by ensuring the data is a valid JSON string before parsing it using the JSON.parse () method. parseJSON () method or if the data is not valid JSON string format. For starters, always double-check if the values you are dealing with are what you expect them to be, and remember, console.log() is your friend. JavaScript programmers have encountered the unexpected token o in json at position 1 at some point in their lives. The Unexpected token u in JSON at position 0 mainly occurs if we pass an undefined value to JSON.parse () method or. We have talked about what JSON is, and what we can do when a parsing error is thrown. JSON is an extremely popular format and is commonly used for data interchanging. And Id like very much recover exactly draft session. Therefore, always double-check your URLs and API routes configuration. And only that message: Unexpected token < in JSON at position 0. For example, if you have a Single Page Application and a backend running Express.js server, it could be set up to always serve an index.html file. Usually, a reason for this was an incorrect URL provided to the fetch method, or the API server route was not set up correctly. json ( ) )Īs for the latter, I have seen the server sending an HTML file on a few occasions. json extension.īelow you can see an example of a JSON format. In the old days XML was primarily used for interchanging data, but since JSON appeared it is often used as a replacement of XML. Values can be strings, arrays, or any other data that can be serialized. It is a lightweight format and consists of name-value pairs. JSON, which is an acronym for JavaScript Object Notation, is one of the most popular data formats used for transmitting data. In this article you will learn what JSON is and how you can deal with errors occurring when parsing JSON data, such as "Unexpected Token < in JSON at Position 0." What Is JSON
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