JSON Minifier

What Is the JSON Minifier?

It removes all unnecessary whitespace from JSON, producing the smallest valid version. It runs in your browser.

When to Use It

• To shrink JSON files served to browsers or apps.
• To put JSON on a single line for environment variables, logs or test fixtures.

How to Use It

1. Paste formatted JSON.
2. Minify and copy the output.

Understanding the Result

The data is identical - only whitespace between tokens is removed. Spaces inside string values are kept.

Limitations

Server compression (gzip or Brotli) already shrinks JSON a lot, so minifying mainly helps with storage and single-line use. Get the readable version back with the JSON Formatter.

Example

{
  "name": "Blue Mug",
  "price": 249,
  "tags": ["kitchen", "gift"]
}

becomes:

{"name":"Blue Mug","price":249,"tags":["kitchen","gift"]}

The space inside "Blue Mug" stays - only whitespace between tokens is removed.

How Much Does It Save?

Pretty-printed JSON with 2-space indentation is often 15-30% larger than the minified version, and deeply nested data can be even more. After gzip or Brotli compression the difference becomes small, which is why minifying matters most for storage, logs and single-line use.

Good Uses

• Putting JSON into an environment variable, a command-line argument or a curl -d body.
• Storing JSON in a database column or cache where size adds up.
• Embedding data in HTML (for example a JSON-LD script) without extra lines.
• Writing one JSON object per line (JSON Lines) for log processing.

Make it readable again with the JSON Formatter, and check it first with the JSON Validator.