JSON Formatter & Validator
Format, validate, minify, and explore your JSON data instantly. Tree view, JSON Path query, and download — all in your browser.
Instant Processing
Format, validate, or minify JSON in milliseconds. No server roundtrips needed.
Collapsible Tree View
Explore large JSON documents with an interactive, color-coded tree. Expand and collapse any level.
JSON Path Query
Extract specific values using JSON Path expressions. Supports dot notation, arrays, and wildcards.
100% Private
Your data never leaves your browser. No tracking, no cookies, no server-side processing.
Copy & Download
One-click copy to clipboard or download as a .json file. Minified output saves as data.min.json.
Flexible Output
Choose 2, 4, or 8 space indentation. Minify for production or beautify for readability.
Frequently Asked Questions
How do I format JSON online?
Paste your JSON into the editor and click Format. The tool instantly pretty-prints your JSON with proper indentation. You can choose 2, 4, or 8 space indentation.
Is my JSON data safe?
Yes. Everything runs entirely in your browser using JavaScript. No data is ever sent to a server. Your JSON never leaves your device.
Can I validate JSON for errors?
Yes. Switch to the Validate tab and the tool will check your JSON syntax, displaying detailed error messages with position information so you can fix issues quickly.
What is the difference between formatting and minifying JSON?
Formatting (pretty-printing) adds indentation and line breaks to make JSON human-readable. Minifying removes all whitespace to reduce file size for production use.
What is the Tree View?
The Tree View displays your JSON as a collapsible, interactive tree structure. You can expand and collapse nested objects and arrays to explore large JSON documents easily. Values are color-coded by type.
How does JSON Path query work?
JSON Path lets you extract specific values from your JSON using path expressions like $.store.book[0].title. Enter a path and click Query to see matching results. Supports dot notation, bracket notation, and wildcards.
Can I download the formatted JSON?
Yes. After formatting or minifying, click the Download button to save the result as a .json file. Minified output saves as data.min.json.
Premium Developer Resources
Like this tool? Get 20+ premium tools
Unlock AI Code Review, AI Doc Generator, AI SQL Builder, batch processing, and API access. Start your 7-day free trial today.
Free vs Pro
Related Tools
UUID Generator
Generate UUID v4 identifiers. Bulk generate up to 25 at once.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
SQL Formatter
Format and beautify SQL queries with customizable keyword casing.
YAML to JSON Converter
Convert between YAML and JSON formats instantly. Bidirectional.