Web Reference: Aug 18, 2025 · Working with JSON Previous Overview: Dynamic scripting with JavaScript Next JavaScript Object Notation (JSON) is a standard text-based format for representing structured data based on JavaScript object syntax. It is commonly used for transmitting data in web applications (e.g., sending some data from the server to the client, so it can be displayed on a web page, or vice versa). You'll come ... In this case you are trying to read the data property of a String object. Since this doesn't exist it will be undefined. Next you are trying to access the 0 property of an undefined value which will result in the error you encounter. Using the JSON.parse method will convert the string to a Javascript object which does have a data property. Jan 17, 2026 · In JavaScript, there are multiple ways to read and parse JSON files. These methods can be used both in browser environments and in Node.js. 1. Using the fetch () API. The fetch () API retrieves JSON files asynchronously and parses them into JavaScript objects.
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