JSON Formatter and Minifier | A free, easy online tool

Your JSON

Formatted JSON

Indent

Parse URL GA4 URL Builder Build URL JSON Format Slug Generator

How it Works

Paste any JSON — an API response, a config file, a log line — and the formatter parses it with the browser's native JSON.parse, then re-serialises in the format you choose. Invalid JSON shows the parser's error message inline so you can pinpoint and fix the problem.

Modes

Beautify: Indent with 2 spaces, 4 spaces, or a tab — whichever your codebase prefers.
Minify: Strip every space and newline so the output is the smallest valid representation.

Common Use Cases

API debugging: Make a single-line API response readable.
Config review: Format package.json, tsconfig.json, or any config before committing.
Bundle size: Minify JSON before embedding in URLs, query strings, or HTTP headers.
Validation: Confirm a string is valid JSON before pasting it into another tool.
Diffs: Re-format both sides of a JSON diff with the same indent so the diff is meaningful.

Privacy and Security

The JSON is parsed and reformatted entirely in your browser. Nothing is sent to a server, logged, or stored.

Web Formatting Tools

URL Query Parser - Extract and view query parameters from any URL as a table, JSON, or JavaScript object.
Google Analytics URL Builder - Create a URL with campaign parameters to use with Google Analytics V4
URL Builder - Build or edit a URL by adding query parameters as key/value pairs. Paste an existing URL to seed the rows.
URL Slug Generator - Convert any text into URL-friendly slugs for web addresses