JSONミニファイヤー

About JSON Minifier

JSON Minifier is a free online tool that compresses your JSON code by removing unnecessary whitespace, comments, and redundant characters while preserving all data inside string values. Smaller JSON files mean faster API responses and better application performance.

Features

• Remove whitespace, tabs, and newlines outside string values
• Strip JSONC-style single-line (//) and multi-line (/* */) comments
• Preserve all content inside JSON string values
• Real-time size comparison with savings percentage
• Copy minified output or download as .json file
• 100% client-side — your JSON never leaves the browser

How to Use

1. Paste your JSON code into the input area
2. Click "Minify JSON"
3. View the compressed output and size statistics
4. Copy the result or download the .json file

Common Use Cases

• Optimizing JSON payloads for API responses
• Reducing configuration file sizes
• Preparing JSON for production deployment
• Comparing original vs. minified size
• Cleaning up formatted JSON from editors

FAQ

Is minified JSON still valid?

Yes! Minified JSON is 100% valid JSON. Only unnecessary whitespace and comments are removed — all data, keys, and string values remain intact.

Does minification break my data?

No. String values are fully preserved, including spaces and special characters inside them. Only structural whitespace (outside strings) is removed.

How much size reduction can I expect?

Typically 30–60% reduction for formatted/indented JSON. The more whitespace and comments your JSON contains, the higher the savings.

Can I undo minification?

Use our JSON Formatter to beautify minified JSON back into a readable format with proper indentation.

Is my JSON data sent to a server?

No. All processing happens in your browser. Your JSON code never leaves your device, ensuring complete privacy.