How to Format JSON: Best Practices and Tools

Properly formatted JSON is essential for readability, debugging, and maintainability. Here's everything you need to know about JSON formatting.

Why Formatting Matters

Unformatted (minified) JSON is hard to read and debug. Formatting adds whitespace that makes the structure clear:

Before (minified):

{"name":"Alice","address":{"city":"NYC","zip":"10001"},"hobbies":["reading","coding"]}

After (formatted):

{
  "name": "Alice",
  "address": {
    "city": "NYC",
    "zip": "10001"
  },
  "hobbies": [
    "reading",
    "coding"
  ]
}

2 spaces: Most common in JavaScript/TypeScript projects

4 spaces: Common in Python and Java ecosystems

Tabs: Preferred by some for flexibility and smaller file size

Be consistent — Pick one style and stick with it

Sort keys alphabetically — Makes diffing easier

Use trailing newlines — Good practice for text files

Validate regularly — Catch errors early

Try our JSON Formatter to instantly format your JSON with customizable indentation.