Format & Beautify
Turn one-line JSON into a readable, indented layout (2 spaces / 4 spaces / Tab). Enable "Sort keys" to order object properties alphabetically — handy for diffs.
Online JSON Formatter
A free JSON validator, formatter and minifier — no sign-up required. All processing runs locally in your browser, so your data never leaves your device.
Input JSON
Output
How to Use
Validation & Error Location
Input is validated as you type. On a syntax error, the status bar shows the exact line, column and reason (e.g. trailing comma, unclosed quote). Click the message to jump to the error.
Minify & Escape
"Minify" strips all whitespace for the smallest payload. "Escape / Unescape" converts between JSON text and source-code string literals. "Unicode" tools convert \uXXXX escapes and non-ASCII text.
JSON Syntax at a Glance
{}braces denote an object of key-value pairs; keys must use double quotes;[]brackets denote an array of ordered values;:separates keys from values,,separates elements — no trailing comma after the last element;- Supported types: string, number, boolean (
true/false),null, object and array.
FAQ
What is JSON formatting?
JSON formatting re-indents a compressed or messy JSON string so its structure becomes easy to read and debug.
What if JSON validation fails?
The tool pinpoints the exact line and column of the error with a human-readable reason (e.g. missing comma, unclosed quote). Fix the text at that position and try again.
Is my data uploaded to a server?
No. All formatting and validation runs locally in your browser. Nothing is transmitted over the network, so it is safe for sensitive data.