JSON Formatting Guide

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. It is the most common format for APIs, configuration files, and data storage.

{
  "name": "BuildUtilities",
  "version": "1.0.0",
  "features": ["formatter", "validator", "converter"],
  "active": true
}

Why Format JSON?

Readability: Indented JSON is far easier to scan and debug.
Debugging: Spot missing brackets, trailing commas, and wrong types instantly.
Consistency: Teams use formatters to enforce a single style.
Minification: Remove whitespace for smaller payloads over the network.

Common Mistakes

Trailing Commas

JSON does not allow trailing commas. [1, 2, 3,] is invalid.

Single Quotes

JSON requires double quotes. {'key': 'value'} is invalid.

Unquoted Keys

All keys must be strings in double quotes. {key: "value"} is invalid.

Try It

Paste your JSON into our JSON Formatter to beautify or minify it instantly. Use the JSON Validator to check for syntax errors.

FAQ

What is the difference between JSON and JavaScript objects?

JSON is a string format with strict syntax rules. JavaScript objects are in-memory data structures that can contain functions and symbols.

What is JSON5?

JSON5 is an extension of JSON that allows comments, trailing commas, and single quotes. It is not valid standard JSON.

How do I format JSON in the terminal?

Use cat file.json | python -m json.tool or jq . file.json.