JSON Beautifier

Format, validate, and beautify JSON with syntax highlighting. Minify or pretty-print with customizable indentation. 100% in your browser.

Drop a .json file here or click to browse

.json, .txt files supported

Never uploaded — formatting happens in your browser
No sign-up
No file limit
No sign-up, no file limit

Minified or messy JSON is hard to read, whether it's an API response you're debugging, a config file, or data you're about to send to an endpoint. This JSON beautifier pretty-prints it with 2, 3 or 4 space indentation, checks it as you type and points to the error when it's invalid, and converts it to XML, CSV or YAML. Everything runs in your browser: your JSON is never uploaded.

How it works

How to Beautify and Format JSON

Three steps, no upload and no account.

Step 1: Paste or Upload Your JSON
Click Start with Sample to try it, Blank Editor to paste your own JSON, or drop a .json or .txt file. The JSON is checked as you type: the toolbar shows Valid JSON or Invalid JSON, and an invalid document shows the parser's error message.
Step 2: Choose Indentation and Format
Pick 2, 3 or 4 spaces of indentation, then click Format / Beautify to pretty-print or Minify to put everything on one line. Tick Auto to re-format on every edit.
Step 3: Explore, Convert or Download
Switch between the Code, Form, Text, Tree and View panels to read or edit the data. Copy the result, download it as formatted.json, or convert it to XML, CSV or YAML with one click.

Why choose ours?

Private, instant, no limits

Paste or drop JSON, see the formatted output instantly with syntax highlighting — all without leaving your browser.

Feature	Ours	jsonformatter.org	jsonlint.com	codebeautify.org	jsoneditoronline
Free & unlimited					Limit
No account needed
Data stays in browser
Syntax highlighting
Minify option
Custom indentation
File upload

Competitor information was accurate at time of publication and may have changed.

Frequently Asked Questions

Is my JSON sent to a server?

No. Formatting, validation and conversion all run in your browser, and your JSON never leaves your device. That makes it safe for API responses that contain tokens, personal data or anything else sensitive.

Can I validate JSON without formatting it?

Yes. The JSON is checked every time it changes. The toolbar shows Valid JSON or Invalid JSON, and an invalid document shows the parser's error message, before you click Format.

What does the Fix JSON button do?

Fix JSON appears when your JSON is invalid. It replaces single quotes with double quotes and removes trailing commas before a closing bracket, the two most common mistakes. Because it replaces every single quote, check strings that contain apostrophes afterwards.

Can I convert JSON to XML, CSV or YAML?

Yes. Once the JSON is valid, the XML, CSV and YAML buttons each download the data in that format. The conversion runs in your browser.

What are the Tree and Form views?

Tree shows your JSON as a collapsible tree, which makes large, deeply nested data easier to explore. Form lists every value next to its key so you can edit values directly; the JSON updates when you leave a field.

Which indentation sizes can I choose?

2, 3 or 4 spaces. Minify removes all indentation and line breaks instead, which is useful before pasting JSON into a config value or a request body.

Guides & tutorials

How to Compare JSON Files Online for Free

Compare two JSON files side by side with a structural diff. See additions, deletions, and modifications highlighted in a collapsible tree — 100% in your browser.

Compare Two JSON API Responses

Paste two JSON API responses side by side and instantly see every structural difference. Perfect for debugging staging vs production, before/after deploys, and regression testing.