JSON

JSON, or JavaScript Object Notation, is a lightweight data-interchange format. It is easy for humans to read and write, and for machines to parse and generate. JSON is a text-based format that uses curly braces ({}) to indicate objects, brackets ([]) to indicate arrays, and quotes ("") around string values. It is often used when transferring data in APIs.

Extension: .json

JSON Advantages

Human readable/writeable.
Supports several data types (string, number, object, array, true/false, and null) and nested data structures.
Flexible schema evolution.

JSON Disadvantages

Must read the entire file - can’t read line-by-line
Not compressed
Doesn’t support binary data

There are other versions of JSON that address some of these disadvantages (see BSON and NDJSON.)

JSON Editors/Viewers

JSON Crack - Seamlessly visualize your JSON data instantly into graphs.
VSCode: Prettier - Prettier is an opinionated code formatter. Supports JSON formatting among several other code languages.