How do I validate JSON?

Paste your JSON into the editor and it is validated instantly. If it's invalid, you get an error message pointing at the problem — typically a missing comma, an unquoted key, a trailing comma, or single quotes instead of double quotes.

What are the most common causes of invalid JSON?

The usual suspects: trailing commas after the last item, single quotes instead of double quotes, unquoted property names, comments (JSON does not allow them), and unescaped special characters inside strings.

What is the difference between beautify and minify?

Beautify adds indentation and line breaks so humans can read the structure. Minify strips all whitespace to make the payload as small as possible for transmission or storage. Both produce identical data.

Is it safe to paste API responses with real data here?

Yes. Formatting and validation run entirely in your browser — your JSON never leaves your device and nothing is stored on any server.

JSON Formatter

Format, validate, and beautify your JSON data

100% Private — your data never leaves your device

Your JSON is parsed and formatted entirely in your browser — it never leaves your device or touches a server. Safe for API responses with tokens or personal data.

JSON Formatter & Validator

Paste your JSON to format and validate

Input JSON

Lines: | Characters:

Formatted Output

Lines: | Characters:

Tips:

Format: Beautify JSON with proper indentation (2 spaces)
Minify: Remove all whitespace to compress JSON
Validate: Check if your JSON syntax is correct
Syntax highlighting helps identify strings, numbers, booleans, and nulls