JSON Formatter & Beautifier
Format JSON with your choice of indentation and a collapsible, color-highlighted tree.
About the JSON Formatter & Beautifier
Paste your JSON or upload a file and get it formatted with your preferred indentation: 2 spaces, 3 spaces, 4 spaces, tabs, compact, or JavaScript-escaped. A collapsible tree view shows the object structure with color highlights so you can navigate large documents. Everything runs locally in your browser — your JSON never leaves your machine.
Frequently asked questions
Is my JSON uploaded to a server?
No. Formatting happens entirely in your browser with JavaScript; the content is never sent anywhere.
How large a JSON file can it handle?
Files up to a few megabytes format comfortably; the tree view loads for documents under 1 MB and larger ones fall back to plain text.
Can it minify JSON too?
Yes — choose the compact indentation option to strip all insignificant whitespace.