JSON Viewer & Formatter
Paste or open JSON — validate with exact error locations, explore it as a collapsible tree, pretty-print or minify.
The tree view appears here.
A JSON viewer you can trust with real data
The first rule of debugging an API response full of tokens, emails or customer records should be: don't paste it into a random website that ships it to a server. This viewer runs entirely in your browser — parsing, validation, formatting and the tree view included — so the data in that response never goes anywhere.
Invalid JSON is pinpointed with the exact line and column of the problem. Valid JSON becomes a collapsible tree you can fold section by section — much easier to navigate than a wall of braces — plus one-click pretty-print (2 or 4 spaces) and minify, with copy and download for the result.
How to use it
- Paste JSON on the left, or drop in a .json file.
- Validation runs as you type — errors show the line and column; valid JSON renders as a tree on the right.
- Click Format or Minify to rewrite the text, then copy or download it.
Frequently asked questions
How do I find the error in my JSON?
Paste it in — the exact line and column of the first problem is reported instantly, so trailing commas and missing quotes have nowhere to hide.
Is my JSON uploaded or stored anywhere?
No. Everything runs in your browser — safe for API responses and configs containing keys, tokens or personal data.
Can I format and minify JSON here?
Yes — pretty-print with 2 or 4 space indentation, or minify to one line, then copy or download the result.
Does it handle large files?
Yes — very large documents automatically skip the interactive tree to keep the page fast, while validation and formatting still work.