JSON Formatter & Validator

Format, validate, and minify JSON. All processing happens in your browser.

Paste JSON to get started
Indent
Input
Output

Frequently asked questions

What is JSON formatting?
JSON formatting (also called pretty-printing) adds indentation and line breaks to make JSON data easy to read. Raw JSON from APIs is often minified — all on one line — which is hard to scan. A formatter adds structure so you can quickly find keys and values.
What is JSON validation?
JSON validation checks that your JSON follows the correct syntax. Common mistakes include trailing commas, missing quotes around keys, unmatched brackets, or using single quotes instead of double quotes. A validator tells you exactly which line the error is on.
What is JSON minification?
Minification removes all whitespace and line breaks from JSON, making the file smaller. This is useful when sending JSON over a network where bandwidth matters — smaller payloads mean faster API responses.
Is my data safe?
Yes. All processing happens entirely in your browser. Your JSON is never sent to any server.