JSON Minifier Online
Minify JSON by removing whitespace and formatting. Reduce payload size for APIs and storage.
Open JSON Minifier →Why Minify JSON?
Minified JSON removes all unnecessary whitespace (spaces, tabs, newlines) while keeping the data identical. This reduces payload size by 10-40% depending on how deeply nested and formatted the original is. Smaller payloads mean faster API responses, lower bandwidth costs, and reduced storage. Most production APIs serve minified JSON by default. In JavaScript,
JSON.stringify(obj) without the space parameter produces minified output.Minification vs Compression
- Minification: Removes whitespace. Reversible by reformatting. Reduces size by 10-40%.
- Gzip/Brotli compression: Applied at the HTTP transport layer. Reduces size by 60-90%. Works on any content type.
- Best practice: Use both — minify the JSON, then serve with gzip or Brotli compression. The combination achieves the smallest possible transfer size.
// JavaScript - minify
const minified = JSON.stringify(JSON.parse(formatted));
// JavaScript - minify with validation
try {
const minified = JSON.stringify(JSON.parse(input));
} catch (e) {
console.error('Invalid JSON');
}
# CLI - minify with jq
jq -c '.' input.json > output.json
# Python
import json
minified = json.dumps(json.loads(formatted), separators=(',', ':'))