Messy JSON is painful to read. Our free JSON formatter beautifies it into clean, indented structure you can actually scan — or minifies it down to a single compact line for pasting into code. Paste your JSON and it validates it too, with a readable error message if something is wrong.
Everything runs in your browser, so your data never leaves your device — safe even for sensitive payloads.
How to Use the JSON Formatter
- Paste your JSON into the box.
- Click Beautify for readable indented JSON, or Minify for compact JSON.
- If the JSON is invalid, you will see exactly what is wrong so you can fix it.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is the standard text format for exchanging data between servers and web apps — the format behind most modern APIs.
Why does my JSON fail validation?
The usual culprits are trailing commas, single quotes instead of double quotes, unquoted keys, or comments — all of which strict JSON forbids.
Is my data uploaded anywhere?
No. Formatting and validation happen entirely in your browser with JavaScript, so nothing you paste is sent to a server.
Counting characters in your data? Try our Character Counter.