ClearPaste · Developer Tools
JSON Formatter & Validator
Last updated: August 28, 2026
Paste JSON, get it pretty-printed or minified — and told exactly what is wrong if it does not parse.
What it does
Pretty print expands JSON with indentation so nested structures are readable. Minify strips all whitespace for the smallest payload. Both paths validate first — a broken JSON gives you the parser's error message instead of silent garbage.
Use cases
Reading API responses copied from a terminal. Checking config files before committing. Minifying JSON before pasting into a single-line environment. Debugging the trailing comma a model added to your JSON.
Related tools
Base64 Encode / Decode URL Encoder / Decoder HTML Entity Escape / Unescape
Frequently asked questions
Is my JSON uploaded?
No — parsing happens in your browser with native JSON.parse.
What errors does it catch?
Everything JSON.parse catches: trailing commas, unquoted keys, single quotes, unescaped characters — with the position in the message.
How large can the input be?
Megabytes run fine locally; the limit is your browser tab, not a server.