JSON Beautifier Online — Format, Minify & Validate

JSON is the default data format for APIs, configs, and front-end state. Messy or invalid JSON is one of the most searched developer problems — which is why a JSON beautifier is a high-traffic tool.

What a JSON beautifier does

• Beautify — adds indentation so nested objects are readable.
• Minify — removes whitespace for smaller payloads.
• Validate — catches missing commas, extra commas, and unquoted keys.

Why this tool is private

DevTools Hub formats JSON with JSON.parse and JSON.stringify in your browser. The payload is not uploaded to a server.

Common errors

• Trailing comma after the last property
• Single quotes instead of double quotes
• Comments (JSON does not allow //)