JSON Formatter
Beautify, minify, and validate JSON data
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How to Use
Paste or Type Input
Enter your text, code, or data into the input area.
Choose Options
Select the transformation or format you want to apply.
Copy the Result
Copy the output to your clipboard with one click.
Why Use This Tool
100% Free
No hidden costs, no premium tiers — every feature is free.
No Installation
Runs entirely in your browser. No software to download or install.
Private & Secure
Your data never leaves your device. Nothing is uploaded to any server.
Works on Mobile
Fully responsive — use on your phone, tablet, or desktop.
Understanding JSON Formatting and Validation
Key Takeaways
- Well-formatted JSON improves readability and makes debugging API responses significantly faster.
- JSON validation catches syntax errors like missing commas, unquoted keys, and trailing commas before they cause runtime failures.
- All formatting and validation happens entirely in your browser — your data never leaves your device.
JSON (JavaScript Object Notation) has become the universal data interchange format for web APIs, configuration files, and NoSQL databases. Despite its simplicity, malformed JSON is one of the most common causes of integration failures. A reliable formatter and validator helps developers quickly identify structural issues and produce clean, readable output.
Over 90% of public REST APIs use JSON as their primary response format.
Industry Usage
Common Use Cases
API Response Debugging
Paste minified API responses to instantly see the nested structure, making it easy to locate specific fields and identify unexpected values.
Configuration File Editing
Format and validate package.json, tsconfig.json, and other config files to catch syntax errors before deployment.
Database Document Inspection
Pretty-print MongoDB or Firestore documents to understand complex nested schemas and embedded arrays.
Webhook Payload Analysis
Format incoming webhook payloads from services like Stripe or GitHub to verify data structure matches your expectations.
Pro Tips
Use 2-space indentation for compact output or 4-space for maximum readability — choose based on your team's style guide.
Sort keys alphabetically when comparing two JSON objects to quickly spot differences.
Minify JSON before sending it over the network to reduce payload size and improve transfer speed.
Watch for common pitfalls: trailing commas, single quotes instead of double quotes, and unquoted property names are all invalid JSON.
All JSON formatting and validation is performed entirely in your browser using client-side JavaScript. Your data is never transmitted to any server, ensuring complete privacy for sensitive API responses and configuration data.