JSON Minifier

JSON Minifier is a single-page web tool for developers and content editors. It helps validate JSON, make it human-readable (format/beautify), or compress it (minify) for transmission or storage. Everything runs in your browser for privacy and speed.

Validate, format, minify, compare sizes, copy & download JSON — fully client-side and accessible.

Tool

Paste JSON into the left pane or upload a file. Use the controls to validate, format, minify, compare sizes, copy or download.

Language (visual)

Input JSON (editable)

You can also drag & drop a .json/.txt file below or use the Choose File button.

Choose File

Drop a JSON file here or click to choose

Output JSON

Formatted: 0 B Minified: 0 B

Savings: 0%

Features & Error handling

• Client-side only: nothing is sent to a server — files are read locally in your browser.
• Robust error messages with line/column hints when JSON.parse fails (best-effort).
• Size comparison shows exact byte sizes and percentage savings between formatted and minified JSON.
• Download produces a UTF-8 encoded .json file named json-minified.json (or formatted when appropriate).

Intro

JSON Minifier is a single-page web tool for developers and content editors. It helps validate JSON, make it human-readable (format/beautify), or compress it (minify) for transmission or storage. Everything runs in your browser for privacy and speed.

Why use JSON Minifier?

• Quickly check that JSON is valid before sending to APIs or storing in files.
• Format JSON for debugging and reading.
• Minify JSON to reduce size when sending over network or storing in compact form.
• Compare sizes to see savings and make informed decisions.

How to use JSON Minifier

1. Paste JSON into the left editor or upload a .json/.txt file (drag & drop supported).
2. Click Validate to check for parsing errors. If valid, you will see a success message.
3. Click Format to produce readable, indented JSON in the output pane.
4. Click Minify to remove whitespace — then compare sizes and download if needed.
5. Use Copy to copy the output JSON to your clipboard.

FAQ

It validates JSON, formats it for readability, minifies it to remove whitespace, compares sizes between formatted and minified versions, and lets you copy or download results. All operations run locally in your browser.

No — the tool is client-side. Files you upload are read in your browser via the FileReader API and are not transmitted to any server by this page.

You can upload .json and .txt files containing JSON. If the file doesn't contain valid JSON, an error will be shown.