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JSON Minifier

Strip all unnecessary whitespace from JSON to reduce its size for production use. See exact byte savings instantly.

Input JSON
Minified Output

About JSON Minifier

The JSON Minifier removes all unnecessary whitespace characters - spaces, tabs, and newlines - from your JSON, producing the smallest valid representation. Minified JSON is identical in data content to formatted JSON, just without the human-readable formatting.

When to Minify JSON

  • API responses - Minified JSON reduces payload size, which means faster network transfers and lower bandwidth costs.
  • Configuration files - Minified JSON is useful when embedding config in environments with size constraints.
  • Storage - Storing minified JSON in databases or caches reduces space usage.
  • Testing - Quickly convert a formatted JSON sample into a single-line string for use in test fixtures or code.

How to Use

  1. Paste your JSON into the input area.
  2. Click Minify - all whitespace is removed and the compact JSON appears.
  3. The tool shows the byte reduction achieved.
  4. Click Copy to copy the minified JSON.

How It Works

The tool parses the JSON with JSON.parse() to validate it, then re-serializes it with JSON.stringify() without the spacing argument. This removes all indentation, newlines, and unnecessary spaces while preserving the data structure exactly.

Example

A formatted JSON config of 5KB (with indentation) minifies to ~1.5KB - a 70% reduction. This is the version you should use in API responses and config files in production.

FAQ

No. Minifying only removes whitespace that has no semantic meaning in JSON. All keys, values, and structure remain exactly the same. The minified JSON is fully equivalent to the original.
Yes - use the JSON Formatter tool to pretty-print minified JSON back into a readable format with your preferred indentation.
No. Everything happens in your browser using JavaScript. Your JSON never leaves your device.