JSON Validator
Validate JSON instantly in your browser. Get precise line-number error messages so you can fix issues fast. Your data never leaves your device — all processing is 100% client-side.
Why use our JSON Validator?
Total Privacy
All validation runs in your browser. No data is ever sent to a server, logged, or stored. Perfect for sensitive payloads.
Line-Number Errors
Get exact line and column numbers for every error. No more guessing where the syntax issue is — jump straight to the problem.
Auto-Fix Ready
Pair validation with our formatter and beautifier to fix and prettify your JSON in seconds.
Common use cases
API Debugging
Paste API response bodies to verify they are valid JSON before parsing in your application code.
Config Files
Validate tsconfig.json, package.json, and other config files to catch typos that break your build.
CI/CD Pipelines
Quickly verify fixture files, test data, and deployment configs are valid JSON before pushing through your pipeline.
Data Migration
Validate exported JSON datasets before importing into a new system. Catch corruption or encoding issues early.
Related tools
Frequently Asked Questions
Try the full JSON toolkit
Format, validate, diff, convert — all in one place, 100% browser-side.
Open JSON Formatter