The file will be saved using the JSON Canvas extension '.canvas'. When you open it in a text editor, you can see that it has been saved in JSON Canvas format, as shown below.

ChaosSearch is providing JSON Flex, a powerful new capability that delivers a scalable, cloud-native solution for analyzing JavaScript Object Notation (JSON) log files. The ChaosSearch Data Lake ...

As mentioned, the advantage of a JSON file is that it is text-based, human-readable, and lightweight—so a complicated Twitter stream full of text, images, videos, hashtags, mentions, emojis, and ...