Free Tools / JSON Beautifier
JSON Beautifier
Paste minified or messy JSON to get clean, indented, validated output. Runs entirely in your browser — nothing is uploaded.
Paste minified or messy JSON to get clean, indented, validated output. Runs entirely in your browser — nothing is uploaded.
Minified JSON is great for machines and painful for people. A beautifier adds indentation and line breaks so you can read the structure, and parsing it first doubles as a validity check.
Expand a single-line response from an API or webhook so you can actually see the nesting.
A trailing comma or a missing quote is reported with the parser’s own error message instead of being guessed at.
Tidy package.json, composer.json or app settings before committing them.
Check the JSON body your uptime or API monitor expects and compares against.
No. Parsing and formatting use your browser’s built-in JSON engine — nothing leaves your machine.
JSON is stricter than JavaScript: keys need double quotes, no trailing commas, no comments. The error message points at the position of the problem.
Input is capped at 200,000 characters to keep the page responsive.
Upzilla checks API endpoints and validates the JSON they return, around the clock.