JSON Formatter
JSON online format, parse, validate, minify & escape. Paste your JSON on the left, and the formatted result appears in real-time on the right
Input JSON
Output
FAQ
Is this JSON formatter free?
Yes, completely free — no registration, no credit card, unlimited usage.
Is my JSON data safe?
Absolutely. All processing is done in your browser via JavaScript — your data never leaves your device. No uploads, no logging, no storage of any kind.
What's the difference between formatting and validation?
Formatting makes JSON human-readable (adds indentation and line breaks); validation checks if the syntax is correct and highlights the error line in red.
Can I use it offline?
Yes! Once the page loads, all processing works offline — no internet connection required.
How large of a file can it handle?
We haven't found an upper limit yet. Importing and parsing a 410,000-line (180MB) citylots.json finishes within 5 seconds.
What keyboard shortcuts are available?
Ctrl+Shift+I to import a file, Ctrl+S to export & save. Standard editor shortcuts are also supported.
Common Errors & Fixes
| Error Type | Wrong Example | Correct Syntax |
|---|---|---|
| Trailing comma | {"a": 1,} | {"a": 1} |
| Unquoted key | {name: "John"} | {"name": "John"} |
| Single quotes | {'key': 'value'} | {"key": "value"} |
| Missing comma | {"a": 1 "b": 2} | {"a": 1, "b": 2} |
| Unescaped quotes | {"text": "He said "hello""} | {"text": "He said \"hello\""} |
Why Choose Us
- ✦ Real-time formatting with a split editor/viewer layout — paste your JSON on the left and see the result instantly on the right
- ✦ Live syntax validation that pinpoints the exact error location when parsing fails
- ✦ Built-in unescape support, no extra tools needed
- ✦ Import and export as files — we take care of your clipboard
- ✦ Fully keyboard-driven — complete your workflow without touching the mouse
You May Be Interested
What is JSON
JSON (JavaScript Object Notation, pronounced "Jay-son") is the universal language of data exchange on the internet today. It is a lightweight, human-readable data format widely used by APIs, configuration files, databases, and modern applications for passing information between systems. Think of JSON as a standardized way to organize data using key-value pairs, arrays, and nested objects. It is language-independent — whether you use Python, Java, JavaScript, or Go, JSON can be parsed effortlessly.
Why is JSON so important?
Universal compatibility — all modern programming languages support parsing natively; high readability — humans can understand it at a glance; compact size — no heavy tag overhead; built-in JSON parsing in every browser.
JSON vs XML: Why JSON Won
| Feature | JSON | XML |
|---|---|---|
| Size | Compact, no closing tags | Verbose, heavy tag overhead |
| Readability | Clear and intuitive | Requires mental parsing |
| Parsing speed | Native support in most languages | Requires dedicated parser |
| Data types | Strings, numbers, booleans, null, arrays, objects | All strings |
| API standard | Default format for REST APIs | Rarely used in modern APIs |