JSON Formatter & Validator
Validate JSON syntax, format structured data, troubleshoot parsing errors, and export clean JSON ready for integrations or documentation.
JSON Input
Formatted Output
Sample JSON Templates
Click on any template below to load sample JSON data for testing:
JSON Workflow Guide
What This Tool Delivers
The JSON Validator & Formatter now runs on top of the Monaco editor (the same engine that powers VS Code), so you get native line numbers, bracket matching, and smooth typing while the tool validates your payload, highlights syntax errors, and reprints cleanly indented JSON ready for production. Upload, paste, or generate sample data, then export validated output or copy it straight into Postman, OpenAPI specs, or documentation.
Behind the scenes it parses your text in real time, reports the exact line/column of failures, tracks character and line counts, and offers intelligent suggestions for trailing commas, unquoted keys, or single quotes. Monaco’s inline gutter makes it easier to jump to the failing line, and once the JSON passes, the formatted panel mirrors what your API client or log pipeline expects.
- Auto-format with two-space indentation for readable diffs
- Minify-ready output for compact responses via the download button
- Clipboard helpers and file upload support for rapid iteration
- Sample templates to bootstrap payloads for tests or demos
Best Practices for Clean JSON
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