Make sense of your JSON.

How to use this JSON formatter

1. Paste a JSON document, open a UTF-8 file, or load the sample.
2. Choose indentation, then select Format JSON. Use Minify to remove unnecessary whitespace.
3. If validation fails, read the error and correct your input. The tool never guesses which data you intended.
4. Copy or download the result. Your original input stays editable.

A quick example

This compact object:

{"name":"Ada","roles":["developer","reviewer"],"active":true}

Becomes easier to scan with indentation:

{
  "name": "Ada",
  "roles": [
    "developer",
    "reviewer"
  ],
  "active": true
}

Know the limits

This tool uses JavaScript’s JSON parser. Integers outside ±9,007,199,254,740,991 may lose precision, duplicate object keys keep only the last value, and number notation may change. Warnings appear for unsafe integers and duplicate keys. Keep the original file when exact numeric text matters. Files and pasted input are limited to 2 MB.

Common questions