Why Validate JSON?
Catch syntax errors early, ensure data integrity, prevent API failures, debug faster.
Common JSON Errors
Missing Commas
Forgetting commas between properties causes parse errors. Always separate key-value pairs.
Trailing Commas
Extra comma after last property breaks JSON. Not allowed in standard.
Quote Issues
Must use double quotes, never single. Both keys and string values need quotes.
Unescaped Characters
Newlines, tabs, quotes inside strings must be escaped. Use \n, \t, \".
Validation Methods
Online Validators
Use our JSON Validator - instant feedback, error highlighting, line numbers.
Command Line
jq, json_pp, Python json.tool. Quick validation in terminal.
IDE/Editor
VS Code, Sublime Text, WebStorm have built-in validation. Real-time error detection.
Validation vs Schema Validation
Basic validation checks syntax. Schema validation checks structure and types. Both important.
Error Messages
Learn to read error messages. Position numbers, unexpected tokens, missing elements.
Auto-Fixing
Some tools auto-fix common issues. Be careful - verify changes. Manual review recommended.
Best Practices
Validate before deployment, use linters, enable editor validation, test with real data.
Production Validation
Always validate API responses. Implement error handling. Log validation failures.
Tools We Recommend
JSONLint, our JSON Editor, AJV library, Postman for API testing.