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JSON Formatter
Prettify, minify or validate JSON and browse it as a collapsible tree.
- Paste your JSON
- Choose prettify or minify
- Copy the result
Working with messy JSON
API responses, config files and log dumps often arrive as a single unreadable line of JSON — or with a syntax error buried somewhere in a few thousand characters. Pasting it here reformats it with proper indentation instantly, or points to the exact line and character where something's wrong, so you're not hunting for a missing comma by eye.
The collapsible tree view is built for the opposite problem: JSON that's valid but huge, where you need to navigate a deeply nested structure without scrolling through walls of text. Minify mode does the reverse of prettify, stripping whitespace down to the smallest possible payload for shipping over a network or embedding in code.
Frequently asked questions
- Prettify reformats JSON with consistent indentation and line breaks so it is easy to read. Minify strips all unnecessary whitespace to produce the smallest possible file size — useful for shipping JSON over a network or embedding it in code.
- Paste it in and the tool validates it immediately, pointing out the line and character where a syntax error occurs — like a missing comma, unclosed bracket, or trailing comma — so you can fix it quickly.
- Yes. The collapsible tree view lets you expand and collapse individual objects and arrays, so you can navigate large payloads without scrolling through a huge flat block of text.
- No — formatting, minifying and validating all happen locally in your browser. Your data is never sent anywhere or stored.
- No. It runs entirely in your browser — no software install, no account, no email required.
What does "prettify" vs "minify" mean?
How do I know if my JSON is valid?
Can I explore large or deeply nested JSON with this tool?
Is my JSON data uploaded to a server?
Do I need to install anything or sign up?
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