JSON Validator

Check if your JSON is valid instantly. Get detailed error messages with exact line and column numbers. 100% client-side — your data never leaves your browser.

100% Client-SideNo UploadFree ForeverNo Sign-up
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How to Use the JSON Formatter

1. Paste or type your JSON into the input panel on the left. The tool auto-formats your JSON as soon as you paste it, so you get instant results with zero clicks. You can also click "Load sample" to try it out with example data.

2. Choose your action from the toolbar. Click Format to beautify with your preferred indentation (2 spaces, 4 spaces, or tabs). Click Minify to compress your JSON into a single line. Click Validate to check for syntax errors with precise line and column numbers.

3. Explore and export your formatted output. Switch to Tree View to navigate your JSON structure with collapsible nodes and click any node to copy its path. Use the conversion tabs to transform your JSON into CSV, XML, or YAML. Copy or download the result with one click.

All processing runs entirely in your browser using native JavaScript. Your data is never uploaded to any server, making this tool safe for sensitive or proprietary JSON data. There are no file size limits beyond your browser's memory.

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Frequently Asked Questions

Simply paste your JSON into the input panel and click the Validate button. The tool will instantly tell you if your JSON is valid or show you the exact error with line and column numbers so you can fix it quickly.
The most common JSON errors include: missing or extra commas, unquoted property names, single quotes instead of double quotes, trailing commas after the last item in an array or object, and missing closing brackets or braces.
Yes. All validation happens entirely in your browser using JavaScript. Your JSON data is never sent to any server, making it completely safe for validating sensitive, proprietary, or confidential data.
JSON validation checks if your data conforms to the JSON specification (RFC 8259). JSON linting goes further by also checking for style issues and best practices. This tool performs strict validation against the JSON spec and reports precise error locations.
Yes. Since all processing happens in your browser, the only limit is your browser's available memory. The tool can handle JSON files of several megabytes without any issues.

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