JSON Formatter & Validator
Format and validate JSON instantly. Beautify with two-space indentation, minify for production payloads, get precise error messages with line and column numbers, and browse structured data in a collapsible tree view. Everything runs locally in your browser.
Paste any JSON text and pick Beautify, Minify or Tree. Beautify adds two-space indentation, Minify strips it to a single compact line, and Tree renders the document as an explorable outline with syntax coloring and per-key search.
Input JSON
Formatted output
Nothing to show yet
Paste JSON above or upload a file to see the formatted result.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting, validation and tree views all run locally with JavaScript in your browser. Nothing is uploaded, logged or stored.
Why does my JSON show an error?
The validator reports the line and column of the first syntax problem — usually a missing comma, extra comma, or unquoted key. Fix that spot and paste again.
What does minify do?
Minify removes all insignificant whitespace and newlines to produce the smallest valid representation of your JSON, ideal for API requests or storage.