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Pretty-print and validate JSON responses for faster API debugging. Syntax highlighting, error detection, and collapsible tree view.
API responses come back as a wall of minified JSON — one unbroken line of brackets, braces, and quotes. Finding a specific field in a 500-line JSON response is like searching for a needle in a haystack. Browser developer tools help but lack dedicated JSON features like collapsible sections, path copying, and validation error pinpointing.
Our JSON Formatter takes raw JSON and turns it into a beautifully formatted, syntax-highlighted document. Paste a minified API response and instantly see the structure with proper indentation. The tool validates the JSON and highlights errors with line numbers so you can spot missing commas, unclosed brackets, or invalid values immediately.
Open JSON Formatter & ValidatorNavigate to the JSON Formatter tool.
Copy the API response from your terminal, Postman, or browser dev tools and paste it.
The JSON is instantly formatted with syntax highlighting and indentation.
If the JSON is invalid, the tool highlights exactly where the error is — missing comma, extra bracket, etc.
Copy the formatted JSON or download it for sharing with teammates.
No signup, no upload, 100% private. Works right in your browser.
Open JSON FormatterConvert JSON arrays to CSV format for spreadsheets and data analysis.
Convert JSON data to XML format and XML back to JSON.
Convert JSON data to YAML format for configuration files.
Convert CSV data to JSON and JSON to CSV format online.