Is my JSON data sent to a server?

No. This JSON formatter runs entirely in your browser. Your data never leaves your device unless you choose to export or share it.

How do I format JSON online?

Paste your JSON into the editor and click Format, or use the keyboard shortcut ⌘⇧F. The tool prettifies with readable indentation instantly.

Yes. Validation runs live as you type. Invalid JSON shows the error message with line and column numbers.

Yes. Click Minify or press ⌘⇧M to compress JSON into a single line without spaces.

Yes. Drag and drop a .json file or click the upload zone. Files up to 5MB are supported in the browser.

Yes. The interface is responsive and works on modern mobile browsers with paste and touch-friendly controls.

No. This tool runs entirely in your browser. Your data never leaves your browser.

Developer Tools

Is my JSON data sent to a server?: No. This JSON formatter runs entirely in your browser. Your data never leaves your device unless you choose to export or share it.
How do I format JSON online?: Paste your JSON into the editor and click Format, or use the keyboard shortcut ⌘⇧F. The tool prettifies with readable indentation instantly.
Can this tool validate JSON?: Yes. Validation runs live as you type. Invalid JSON shows the error message with line and column numbers.
Can I minify JSON?: Yes. Click Minify or press ⌘⇧M to compress JSON into a single line without spaces.
Can I upload a JSON file?: Yes. Drag and drop a .json file or click the upload zone. Files up to 5MB are supported in the browser.
Does it work on mobile?: Yes. The interface is responsive and works on modern mobile browsers with paste and touch-friendly controls.

Validate JSON online with line-level syntax errors. Free, instant, and private — runs entirely in your browser.

Minify and compress JSON to a single line in your browser. Free, fast, and private.

Convert JSON to YAML online in your browser. Free, fast, and private — no server upload.

Convert YAML configs to formatted JSON in your browser. Free, private, and instant.