Formatting JSON safely

Validate before you format

JSON has strict rules: double quotes for strings, no trailing commas, and only one top-level value. A formatter can’t guess what you meant if the input isn’t valid JSON, so it helps to get a clear error first and fix that line.

Common errors

• Trailing commas after the last item in an object/array.
• Single quotes instead of double quotes.
• Unescaped characters inside strings (like raw newlines).

Don’t paste secrets

Logs and config files often include API keys, tokens, cookies, and passwords. Before you share JSON with anyone, remove or mask sensitive fields. If you’re working with auth headers, treat them like passwords.

Try it

Tool: JSON Formatter