Input JSON
Formatted Output
Formatted JSON will appear here
JSON Syntax Guide
Data Types
- String: Text in double quotes -
"hello" - Number: Integer or decimal -
42,3.14 - Boolean:
trueorfalse - Null:
null- represents no value - Array: Ordered list -
[1, 2, 3] - Object: Key-value pairs -
{"key": "value"}
Common Errors
- Missing comma between array/object elements
- Trailing comma after last element (not allowed in strict JSON)
- Single quotes instead of double quotes for strings
- Unquoted keys in objects
- Comments are not allowed in JSON
All processing happens in your browser - No data sent to server
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Our development team specializes in building RESTful APIs, integrating third-party services, and implementing robust data validation. We ensure your JSON-based systems are secure, performant, and maintainable.
Understanding JSON
JSON Data Types
JSON supports six data types:
- String: Text in double quotes ("hello")
- Number: Integer or decimal (42, 3.14)
- Boolean: true or false
- Null: null (represents no value)
- Array: Ordered list [1, 2, 3]
- Object: Key-value pairs {"key": "value"}
JSON vs JavaScript
While JSON looks like JavaScript object syntax, strict JSON has key differences: property keys must be double-quoted, no trailing commas allowed, no comments, no undefined values, and no functions. Many JavaScript objects aren\'t valid JSON!
Common Use Cases
- 1.API Development: Validate JSON request/response payloads before sending to ensure proper format and prevent API errors.
- 2.Configuration Files: Many apps use JSON for config (package.json, tsconfig.json, etc.). Validation catches syntax errors before deployment.
- 3.Data Import/Export: Validate JSON exports from databases or third-party APIs before importing into your systems.
- 4.Learning & Debugging: Understand JSON structure visually with tree view and identify syntax issues quickly with detailed error messages.
JSON Best Practices
- ✓Use double quotes for strings and property keys, never single quotes
- ✓No trailing commas after the last element in arrays or objects
- ✓Proper nesting - ensure all brackets and braces are properly closed
- ✓Escape special characters in strings (quotes, backslashes, newlines)
- ✓Use null for missing values, not undefined or empty strings
- ✓Minify for production to reduce file size, but keep formatted for development
Frequently Asked Questions
Common questions about the JSON Validator
JSON (JavaScript Object Notation) is a lightweight data format used for APIs, config files, and data exchange. Validation ensures your JSON is syntactically correct before using it, preventing errors in applications. Even a missing comma or quote can break JSON parsing.
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ℹ️ Disclaimer
This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to or stored on our servers. While we strive for accuracy, we make no warranties about the completeness or reliability of results. Use at your own discretion.