# Developer Guide to JSON Validation, Prettifying & Error Debugging
JSON (JavaScript Object Notation) is the de facto standard for data interchange across web applications, REST APIs, and microservices. Despite its simplicity, minor syntax bugs can crash client applications or API parsers.
TargetRoot provides a lightning-fast [JSON Formatter](/tools/formatter/json-formatter) to clean, validate, and debug your JSON data.
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## Common JSON Errors and How to Prevent Them
1. **Trailing Commas:** Standard JSON (RFC 8259) forbids trailing commas after the final key-value pair in an object or array.
2. **Single Quotes vs Double Quotes:** Keys and string values MUST be wrapped in double quotes (`"key": "value"`), never single quotes (`'key'`).
3. **Unquoted Keys:** JavaScript object notation allows unquoted keys, but strict JSON parsers will throw a syntax error.
4. **Unescaped Control Characters:** Line breaks inside string values must be escaped as `\n`.
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## Features of TargetRoot JSON Formatter
- **1-Click Prettify & Minify:** Toggle between readable 2-space indentation and compact minified strings.
- **Strict Syntax Highlighting:** Immediately locate invalid line numbers and character positions.
- **Zero Server Exposure:** Everything runs client-side in your browser for absolute security.
Try the [JSON Formatter Tool](/tools/formatter/json-formatter) or explore [JSON to XLSX](/tools/data/json-to-xlsx).
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