JSON Minification: Why and How to Minify JSON

What Is JSON Minification?

JSON minification removes all unnecessary whitespace without changing the data. A pretty-printed 10KB JSON file can shrink to 3-5KB minified.

JavaScript: JSON.stringify

// Omit the indent parameter
const minified = JSON.stringify(data);

// Minify a JSON string
const minified = JSON.stringify(JSON.parse(jsonString));

Python

import json
data = {"name": "Alice", "age": 30}
minified = json.dumps(data, separators=(',', ':'))
print(minified)  # {"name":"Alice","age":30}

Command Line

# Python one-liner
python3 -c "import json,sys; print(json.dumps(json.load(sys.stdin), separators=(',',':')))" < input.json

# jq
jq -c . input.json > output.min.json

How Much Does Minification Help?

Minification vs Compression

Gzip or Brotli compression already achieves 70-90% size reduction on JSON over HTTP. Always enable gzip at the server level before worrying about minification.

FAQ