JSON Formatter, Validator & Minifier — Free Online Tool

JSON input

Output

Indent

What is a JSON formatter?

JSON (JavaScript Object Notation) is a lightweight data format used to exchange information between servers and web applications. Raw JSON from an API response is often compact and hard to read. A JSON formatter re-indents the data so its structure — objects, arrays, and nested keys — is immediately clear.

Features

Pretty print — adds whitespace and indentation for human readability
Minify — strips all unnecessary whitespace to reduce payload size
Validate — detects syntax errors in real time as you type, with a clear error message
Stats — shows the root type, number of top-level keys, and total node count

How to use

Paste any JSON string into the input area. The tool validates it live while you type. Press Pretty print to format, or Minify to compress. Use the indent selector to choose 2 spaces, 4 spaces, or a tab character. Everything runs locally in your browser — your data is never uploaded anywhere.