JSON Formatter/Validator
Format, validate, and beautify JSON with syntax highlighting.
About this tool
Working with JSON can be tricky when it arrives as one long line or with inconsistent spacing. Our JSON formatter and validator lets you paste any JSON string and instantly see it neatly indented and easy to read. Syntax highlighting makes keys, values, and structure clear at a glance. If something is wrong—a missing comma, an extra bracket, or invalid characters—the tool points you to the exact location so you can fix it quickly. No need to install anything or create an account; everything runs in your browser. Whether you're debugging an API response, preparing config files, or learning how JSON is structured, this free tool keeps your data private and gives you a clean, validated result you can copy or download. Use it as often as you like with no limits.
How to use
Paste your JSON in the input area and click Format to beautify or validate. Invalid JSON will show an error message with the position of the issue.
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Pro tips
- •Use keyboard shortcuts where available to speed up your workflow.
- •Large inputs are processed in your browser—nothing is sent to our servers.
- •Bookmark this tool for quick access from your browser bar.