Paste JSON below to beautify, minify or validate it. Everything runs in your browser — your data never leaves your device.
No. All formatting and validation happens locally in your browser using JavaScript. Nothing you paste is uploaded anywhere.
It removes all whitespace and line breaks to produce the smallest valid JSON, useful for saving space or sending over the network.
Common causes are trailing commas, single quotes instead of double quotes, or missing brackets. The validator points to the position of the first error.