JSON Minifier
Minify and compress JSON by removing whitespace
JSON Input
Minified Output
What is JSON Minifier?
Need to shrink your JSON file size? This tool removes all the extra whitespace, line breaks, and indentation from your JSON (JavaScript Object Notation). Your JSON stays completely valid, just way smaller.
As MDN Web Docs explains, smaller files mean faster load times and less bandwidth. Our minifier follows the RFC 8259 JSON specification, so your minified JSON is still valid and works everywhere.
Everything happens in your browser – your JSON never leaves your computer. See exactly how much space you save with our real-time size comparison.
What Makes This Tool Different
Instant Compression
Paste formatted JSON and get minified output instantly. We strip out all whitespace, line breaks, and indentation while keeping everything valid.
Size Comparison
See exactly how much space you save. We show you the original size, minified size, and percentage saved right there in real-time.
Valid Output
Minified JSON is still valid JSON. It works with any parser, API, or app. We only remove whitespace – your data stays intact.
File Upload Support
Got a big file? Just upload it. Works great for minifying those massive config files or API dumps without copy-pasting.
Copy & Download
One click to copy, or download it as a file. Great for production deployments or API requests where size matters.
Syntax Highlighting
Even minified JSON gets syntax highlighting. Makes it easier to verify the output looks right.
How It Works
Paste or Upload JSON
Drop your formatted JSON into the left editor, or upload a file if you prefer. Not sure what to expect? Hit "Sample" to see how it works. We accept any valid JSON structure.
Automatic Minification
As soon as you paste, the minifier processes your JSON and displays the compressed version on the right. Watch the stats bar to see how much space you saved.
Copy or Download
Click "Copy" to copy the minified JSON to your clipboard, or "Download" to save it as a file. The minified JSON is ready to use in production.
When You'd Actually Use This
Production Deployment
Minify JSON before deploying to production. Smaller files mean faster API responses, reduced bandwidth costs, and better performance for your users.
Mobile Optimization
Every byte counts on mobile networks. Minified JSON reduces data usage, improving load times and user experience on slower connections.
Config Files
Minify JSON configuration files for production. Keeps settings valid while reducing file size, especially useful for large configs.
Common Questions
Is my JSON data stored?
Nope. Everything happens right in your browser using JavaScript's native JSON.parse() and JSON.stringify(). Your data never leaves your computer.
How much space can I save?
It depends on how much whitespace your JSON has. Well-formatted JSON with lots of indentation can save 30-50% of file size. Our stats bar shows you exactly how much you saved.
Does minification break JSON?
Nope. Minified JSON is still valid JSON. We only remove whitespace – all your data, structure, and syntax stay intact. It works with any JSON parser.
Can I format minified JSON back?
Yep. Use our JSON Formatter tool to format minified JSON back to readable format. Minification is totally reversible.
What's the difference from compression?
Minification removes whitespace only. Compression (like gzip) uses algorithms to reduce file size further. Minified JSON can still be compressed for even smaller files.
Can I minify invalid JSON?
Nah, you'll need valid JSON first. We validate it before minifying. If something's broken, we'll show you an error. Fix the syntax errors, then minify again.
Other JSON Tools You Might Need
Minification is just one JSON task. Here are other tools that work well together:
Need to learn more about JSON? Check out the official JSON.org website or the comprehensive guide on MDN.