JSON Formatter & Validator
Format, validate, and beautify JSON data with syntax highlighting
What is JSON Formatter & Validator?
JSON Formatter & Validator takes minified or messy JSON data and formats it with proper indentation and syntax highlighting for easy reading. It also validates your JSON structure, highlighting errors with line numbers so you can quickly fix syntax issues. Essential for developers working with APIs, configuration files, or any JSON data.
How to Use This Tool
- Paste your raw or minified JSON into the input editor
- Click Format to beautify the JSON with proper indentation
- Validation errors appear instantly with line numbers and descriptions
- Use the Minify button to compress JSON for production use
Common Use Cases
- Formatting API responses to inspect nested data structures
- Validating JSON configuration files before deploying applications
- Debugging malformed JSON from third-party services or webhooks
- Converting minified JSON to readable format for code reviews
Frequently Asked Questions
What JSON errors does it detect?
It detects all standard JSON syntax errors including missing brackets, trailing commas, unquoted keys, invalid escape sequences, and duplicate keys.
Can it handle large JSON files?
Yes, the formatter runs in your browser and can handle files up to several megabytes. For very large files (50MB+), consider using a desktop tool.
Does it support JSON5 or JSONC?
This tool validates strict JSON per the RFC 8259 standard. Comments and trailing commas (JSON5/JSONC features) will be flagged as errors.