JSON Formatter & Validator
Validate, beautify, or minify JSON data with a single click. Invalid JSON is highlighted with a clear error message to help you debug quickly.
How to Use
Paste your JSON string into the input area, then click "Format" to beautify it with proper indentation (2 spaces), or "Minify" to compress it into a single line. If the JSON is invalid, an error message appears in red showing exactly where the parser failed, making it easy to fix syntax issues.
Why Choose This Tool?
This tool uses the browser's native JSON.parse for validation, which is both fast and standards-compliant. It handles large JSON payloads (megabytes of data) without lag. All processing is local, making it safe for API keys, tokens, and other sensitive configuration data.
Frequently Asked Questions
What counts as valid JSON?
Valid JSON must use double quotes for keys and string values, cannot have trailing commas, and must use proper data types (strings, numbers, booleans, null, arrays, objects). Single quotes and JavaScript-style comments are not valid JSON.
Can it handle JSON arrays?
Yes. The tool handles any valid JSON value: objects, arrays, strings, numbers, booleans, and null. Top-level arrays like [1, 2, 3] are fully supported.
Does it validate JSON Schema?
No. This tool validates JSON syntax only (parsing correctness). For JSON Schema validation, you would need a dedicated schema validator tool.
Is it completely free?
Yes. No hidden fees, no limits, no ads.
Is my data safe?
Absolutely. All parsing and formatting happens locally in your browser. Your JSON data is never sent to any server.