JSON Formatter & Validator

Format and validate JSON instantly. Paste your JSON to beautify (pretty-print with indentation) or minify it, and get clear error messages if the JSON is invalid. Everything runs locally in your browser.

• Beautify JSON with proper indentation for readability.
• Minify JSON to a single compact line.
• Validates and shows the exact syntax error if invalid.
• Private — your data never leaves the browser.

Frequently asked questions

What does beautify do?

It re-indents your JSON with two spaces per level so it is easy to read.

Is my JSON uploaded anywhere?

No, parsing and formatting happen entirely in your browser.

Why is my JSON invalid?

Common causes are trailing commas, single quotes instead of double quotes, or missing brackets.