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. 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. Therefore, always double-check your URLs and API routes configuration. 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. Select a phone or tablet to emulate, and click Next. Select Launch Emulator, then click the button at the end of the Android virtual device line to open the Android Virtual Device Manager. Usually, a reason for this was an incorrect URL provided to the fetch method, or the API server route was not set up correctly. Click the Run button ( ) to open the Device Chooser. 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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