It is a standard type of data interchange format. Several JavaScript applications which are server-based, like node.js, reactJS, etc., uses this file to store the configuration information.NoSQL databases like Elasticsearch and MongoDB use it to store unstructured data.Google+ saves profile data using JSON files.Mozilla Firefox uses JSON files to save bookmark backups.There are several popular websites or search engines that use JSON files. But now, JSON files are used for several other purposes. In early days, JSON files was used to transmit the data between server and web applications. Usually, JSON files are backup files, which is used to take backup of data that restored back to the application when needed. To import, open the bookmark Library, click the import/export button in the top bar, choose Restore → Choose File., and then select your JSON backup file.A JSON refers to the JavaScript Object Notation format used to store simple objects and data structures. You can also make manual backups of Firefox bookmarks and import them into a different copy of Firefox. The files are saved to the Firefox user profile directory within a folder called bookmarkbackups. Mozilla Firefox saves bookmark backups using JSON files. After logging in, you can choose the 'Data liberation' page and select 'Download your Profile data.' One example is Google+, which uses JSON files for saving Profile data. However, some applications do enable users to save. json files on the hard drive since the data interchange occurs between Internet-connected computers. While many applications use JSON for data interchange, they may not actually save. It is becoming increasingly popular as an alternative to XML.

JSON is commonly used in Ajax Web application programming.

The JSON format was originally based on a subset of JavaScript but is considered a language-independent format, being supported by many different programming APIs.

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