JSON Minifier

Minify valid JSON locally without changing whitespace inside strings.

Minify JSON

Remove formatting whitespace by parsing and serializing one valid JSON value.

Minified result

Minified JSON will appear here after you submit the form.

How to minify JSON

Paste one valid JSON value into JSON input.
Select Minify JSON to parse and compact the value.
Review the one-line result, then copy it when needed.

Minification example

A formatted object such as:

{
  "name": "Ada",
  "active": true
}

Becomes {"name":"Ada","active":true}.

Exact behavior and limits

This tool uses JSON parsing followed by compact JSON serialization. It does not remove whitespace with regular expressions, so spaces, newlines, escaped quotes, Unicode, and emoji inside strings retain their JSON meaning.

Each input is limited to 1,000,000 JavaScript string characters. Browser JSON parsing represents numbers as JavaScript numbers, so integers outside the safe-integer range may lose precision.

Browser-local privacy

Your input and results are processed in this browser and are not uploaded by this tool. Nothing is saved to cookies, local storage, a history, or the page URL.