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Free JSON Formatter Online
Format, minify, and validate JSON instantly in your browser.
Introduction
A JSON formatter turns compact data into readable structure so you can debug payloads, APIs, and config files faster. Whether you are working with API responses, configuration files, or application logs, this free JSON formatter helps you quickly format, minify, and validate your JSON data right in your browser. No sign-up, no uploads, no waiting — just paste, format, and copy.
How To Use
Step 1
Paste your JSON
Insert raw JSON from an API response, config file, or application log. You can paste directly or type into the input area. The tool accepts any valid JSON structure, from simple objects to deeply nested arrays.
Step 2
Choose format or minify
Select your desired output mode. "Format" (or "Beautify") adds proper indentation and line breaks to make JSON human-readable. "Minify" removes all unnecessary whitespace to reduce file size for faster transmission or storage.
Step 3
Validate and copy
The tool automatically validates JSON syntax after formatting or minifying. If there are syntax errors, it highlights the problem area with helpful error messages. Once your JSON is valid, copy the result with one click.
Examples
Input
{"name":"Madabase","active":true,"tools":30}Output
FAQ
Does this tool upload my input?
No. This tool runs in your browser for the first release, so your input stays local.