JSON viewer & validator
Paste JSON on the left. It formats and validates as you type — invalid JSON shows the parser’s error instead of a blank result.
Formatted, validated JSON will appear here.
FAQ
- Is my JSON uploaded anywhere?
- No. Parsing and formatting happen entirely in your browser with JavaScript's built-in JSON parser — nothing you paste is sent to a server or stored.
- Why does it say my JSON is invalid?
- The error message under the input is JavaScript's own parser error, which usually names the type of problem (an unexpected token, a trailing comma, an unquoted key) and roughly where in the text it happened.
- What's the difference between the formatted and minified copy buttons?
- Formatted adds 2-space indentation for reading; minified strips all whitespace for the smallest possible payload, which is what you'd actually send over an API in production.