JSON Minifier — free online tool

What does this do?

Minified JSON is what you send over the wire, store in databases, or commit to a vendor file. This tool parses your input in a Web Worker, validates it, then emits the most compact valid JSON: no spaces between tokens, no indentation, no trailing newline. The stats bar shows the byte count so you can see exactly how much you saved.

When to use it

• ▸Reduce request/response size in a slow API
• ▸Compress JSON before storing in a column or cache
• ▸Embed JSON in a URL or query parameter
• ▸Prepare fixture files for production use

Tip

Minifying is lossless — value, type, and key order are preserved. Switch to the "Pretty" tab to expand it back. To both minify and sort keys, toggle "⇅ Sort keys" first.

Example: Pretty config → minified

{
  "name": "elefcode",
  "version": "1.0.0",
  "description": "Fast browser-based developer tools",
  "scripts": {
    "build": "next build",
    "dev":   "next dev",
    "start": "next start"
  },
  "private": true
}

{"name":"elefcode","version":"1.0.0","description":"Fast browser-based developer tools","scripts":{"build":"next build","dev":"next dev","start":"next start"},"private":true}