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Paste raw JSON — format, validate, minify, or copy. Syntax errors are highlighted instantly.
Paste messy, minified, or unformatted JSON and get clean, indented, readable output in one click. This free JSON formatter also validates your JSON and highlights syntax errors — so you can spot the missing comma or bracket that's breaking your API response. Used daily by developers working with REST APIs, configuration files, and data pipelines.
Three things: Format (pretty-print with 2-space indentation), Validate (check for syntax errors and show exactly what's wrong), and Minify (compress to a single line for production use). Whether you're debugging an API response, editing a package.json, or preparing data for import, this tool handles it.
Sometimes you just need to quickly format a JSON blob from Postman, a Slack message, a log file, or a documentation page. Opening VS Code, creating a file, pasting, and formatting is slower than pasting into a browser tab that's already open. Bookmark this tool and it becomes your fastest path from messy JSON to readable JSON.
Yes — the formatting and validation happen in your browser using JavaScript's native JSON.parse and JSON.stringify, which are highly optimized. Files up to several megabytes process instantly. For truly massive files (100MB+), a desktop tool like jq would be more appropriate.