Yes. If your JSON has a syntax error, the tool reports it so you can correct it before formatting.
Usually a trailing comma, single quotes, or an unclosed bracket. Standard JSON requires double quotes and no trailing commas.
Yes. JSON Formatter is completely free with no sign-up, no watermarks and no usage limits.
No. JSON Formatter runs entirely in your browser, so your data never leaves your device.
Only your device's available memory — there are no server-side limits because nothing is uploaded.
Beautify, indent and validate messy JSON in one click.