JSON Validator & Beautifier — Format & Minify JSON

Free JSON validator and beautifier online. Validate, format, prettify, and minify JSON data with syntax highlighting and error detection instantly.

How to Use

Paste your JSON into the input box. Choose indentation style if beautifying.

Click Beautify to format, Minify to compress, or Validate to just check syntax.

See the result with stats (root type, key count, depth, lines, size). Copy or download.

What is a JSON Validator?

A JSON validator checks whether your JSON data is syntactically correct. JSON (JavaScript Object Notation) is the most widely used data format for APIs, configuration files, and data exchange. Common errors include missing quotes, trailing commas, and incorrect nesting. This tool also beautifies JSON with your preferred indentation, minifies it for production use, and shows structural stats like key count and nesting depth.

Frequently Asked Questions

What does this tool do?
It validates JSON syntax, formats (beautifies) it with proper indentation, minifies it by removing whitespace, and shows stats like key count, depth, and size.
What is valid JSON?
Valid JSON must use double quotes for keys and strings, cannot have trailing commas, and must be a valid object, array, string, number, boolean, or null at the root level.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks for readability. Minify removes all unnecessary whitespace to make the JSON as compact as possible — useful for APIs and storage.
Is my JSON data saved?
No. All processing happens on our server per request. Your JSON is not stored, logged, or shared.
What indentation options are available?
You can choose 2 spaces, 4 spaces, or tab indentation for the beautified output.

Share This Tool

Found it useful? Share it with your friends, classmates, or colleagues.

WhatsApp Facebook X Telegram LinkedIn