JSON Beautifier & Validator
Format, validate, minify, and explore JSON as a collapsible tree. Instant, no signup.
How to Use the JSON Beautifier
Format messy JSON in three steps — no account, no installation, no limits.
Paste your JSON
Paste raw, minified, or broken JSON into the input panel on the left. You can also click ↑ upload to load a .json file from disk, or ⎘ paste to pull directly from your clipboard.
Click Beautify (or press Ctrl + Enter)
The formatter instantly validates your JSON and renders it with clean indentation. Errors are highlighted with the exact line and column so you can fix them fast. Toggle Sort Keys to alphabetise all object keys, or switch between 2 and 4 space indentation.
Explore, copy, or download
Browse the interactive Tree view, search any key or value, switch to the Formatted or Minified tab, then copy to clipboard or download as formatted.json.
Everything You Need to Work with JSON
A complete online JSON toolkit — all features run locally in your browser. Your data never leaves your device.
JSON Beautifier
Pretty-print any JSON with configurable indentation (2 or 4 spaces). Turns single-line blobs into human-readable code.
JSON Validator
Instantly validate JSON against the RFC 8259 spec. Get the exact error with line and column number so you can fix it without guessing.
JSON Minifier
Strip all whitespace and produce the smallest possible JSON string. Perfect for reducing payload size in API responses and config files.
Collapsible Tree View
Navigate deeply nested JSON with an interactive tree. Expand or collapse any node. Search keys and values with live highlight — matching ancestors auto-expand.
Sort Keys
Recursively sort all object keys in alphabetical order. Useful for diffing two JSON objects or enforcing a consistent key order in config files.
Download & Upload
Load a .json file from disk with the upload button, or export your formatted result as a file with one click. No size limits.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data-interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is the standard data format for REST APIs, configuration files, and data storage across almost every programming language.
What is the difference between beautify and minify?
Beautify (also called pretty-print or format) adds indentation and line breaks to make JSON human-readable. Minify does the opposite — it removes all unnecessary whitespace to produce the smallest possible string, which reduces bandwidth when transmitting data over a network.
Is my JSON data safe? Does it get sent to a server?
Yes, completely safe. All processing happens entirely in your browser using JavaScript. Your JSON is never uploaded to any server, stored, or logged. You can even use this tool offline after the page has loaded.
Why is my JSON invalid?
Common JSON errors include: trailing commas after the last property, single quotes instead of double quotes around keys or strings, unquoted keys, undefined or NaN values (not valid in JSON), and comments (JSON does not support // or /* */). The validator will show you the exact line and column where the error occurs.
Can I format very large JSON files?
Yes. Since processing is local, there is no server-side file size limit. Very large files (tens of MB) may take a moment to render the tree view due to DOM size, but the Formatted and Minified text tabs handle large files without issue.