JSON Formatter Online
Format, beautify, and pretty print JSON instantly in your browser.
How to Format JSON
Use this free online JSON formatter when your JSON is cramped onto one line or hard to scan. It beautifies and pretty prints the text so keys and values are easier to read — without changing the data itself.
Paste JSON from an app or API, or upload a .json file. Everything runs in your browser, so nothing is sent to a server.
Format JSON in 3 steps
Paste JSON
Paste JSON text or upload a .json file into the editor. Your file stays on this device.
Click Format
Choose 2 spaces, 4 spaces, or tabs, then click Format JSON to make the document easy to read.
Copy formatted result
Copy the result or download formatted.json when you are ready to use it.
Need a smaller file instead? Minify JSON. Want to check for errors first? Validate JSON.
JSON Formatter Features
- Pretty printing with 2 spaces, 4 spaces, or tabs
- Easy-to-read highlighting in the editor
- Clear messages when JSON is invalid
- Sort keys A–Z
- Minify JSON in one click
- Works in your browser — no upload
- Free to use, no account required
- Format pasted text or .json files
JSON Formatter Example
Compact JSON is hard to scan. After formatting, each key sits on its own line with consistent indentation, so the same data is much easier to review.
{"name":"Alice","age":25}{
"name": "Alice",
"age": 25
}JSON Formatter vs JSON Validator
| JSON Formatter | JSON Validator | |
|---|---|---|
| What it does | Changes appearance | Checks correctness |
| What you get | Indented, readable JSON | Valid or invalid, with where the error is |
| Best for | Reading and editing JSON | Finding and fixing mistakes |
| Try first | Format JSON when the text is valid | Validate JSON if you are unsure |
Looking for differences between two JSON files? Compare JSON files.
Frequently asked questions
What is a JSON formatter?
A JSON formatter takes hard-to-read JSON and rewrites it with clear spacing and line breaks so the structure is easier to follow. People also call this beautifying or pretty printing JSON.
How do I format JSON?
Paste your JSON or upload a .json file, choose an indent style if you want, then click Format JSON. Copy or download the result when you are done. Need a smaller file instead? Use JSON Minify. Want differences between two files? Try JSON Compare.
Is JSON formatter free?
Yes. This JSON formatter is free to use in your browser, with no account and no sign-up.
Does this JSON formatter upload my data?
No. Formatting, minifying, and validation all run on your device. Your JSON is never uploaded. For a dedicated syntax check, open the JSON Validator.
What is pretty print JSON?
Pretty print JSON means adding indentation and line breaks so nested values are easier to read and edit. The data stays the same; only the spacing changes.