JSON Formatter & Validator
Format, validate, minify, and beautify JSON data with syntax highlighting. No signup, no watermarks, 100% private — everything runs in your browser.
Quick Answer
Just paste your JSON payload into the editor below and we instantly validate and beautify it using syntax highlighting! Formatted securely and locally in your browser.
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100% Private & Secure
JSON parsing is local
Interactive Tree
Click to expand/collapse nodes
Syntax Highlighting
Read complex payloads easily
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Why Use SwiftTools JSON Formatter?
🔍 Real-time Validation
Never guess if your API payload is formatted properly. SwiftTools performs instantaneous validation to provide clear error tracing and feedback before you send any data.
🎨 Native Syntax Highlighting
Quickly read complex, nested JSON data. Our dual-pane viewer natively color codes keys, strings, booleans, arrays and numbers for maximum readability.
⚡ Advanced Formatting
Easily beautify minified data (2-space or 4-space tab choices), or squeeze huge JSON strings by stripping whitespace with our 1-click Minify button.
🔒 100% Offline Parsing
API payloads often contain extremely sensitive authentication keys, passwords, and PII. Guarantee your security with local browser formatting that NEVER hits a remote server.
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JSON Formatter: Frequently Asked Questions
Is JSON Formatter free to use?
Yes, JSON Formatter on SwiftTools is completely free with no signup, no watermarks, and no usage limits. Everything runs in your browser for maximum privacy.
Is my text data kept private?
Absolutely. Your text is processed locally in your web browser — nothing is uploaded to any server. Your writing stays on your device at all times.
Do I need to install any software?
No installation required. JSON Formatter works directly in any modern web browser on Windows, Mac, Linux, iOS, or Android.
How do I know if my JSON is valid?
As soon as you paste your JSON, the tool performs real-time validation. If there are syntax errors (such as missing quotes or commas), an "Invalid JSON" badge will appear with specialized error output highlighting where it failed.
Can I minify my JSON?
Yes! Simply click the "Minify JSON" button. Your beautified payload will immediately condense down to remove all unnecessary whitespace, saving you bandwidth during transfer.