Validate Your JSON Instantly
Use our free online JSON Validator to check the syntax of your JSON data quickly and securely. No need to install any software — validate your JSON directly in your browser!
How to Validate JSON?
- Paste your JSON data into the input box below.
- Click on the \"Validate JSON\" button.
- We will tell you instantly if your JSON is valid or if there are errors — and exactly where!
JSON Validator Tool
Why Validate JSON?
Even a small syntax mistake can break your JSON file, making it unreadable by programs or APIs. JSON validation helps you:
- Find and fix syntax errors (like missing commas or brackets).
- Ensure data is ready for use in APIs, databases, and configurations.
- Save time and avoid debugging issues later in your project.
Common JSON Errors You Should Watch For
- Missing double quotes around keys or string values.
- Extra commas after the last element in an object or array.
- Incorrect nesting of objects and arrays.
- Using single quotes instead of double quotes (JSON requires double quotes!).
- Adding comments inside JSON (which is not allowed).
Frequently Asked Questions (FAQ)
1. Is my JSON data safe?
Yes. Validation happens 100% locally in your browser. Your data is never uploaded to any server.
2. Can I validate large JSON files?
Yes. Our validator can handle small to reasonably large JSON data smoothly.
3. Will the validator fix errors automatically?
No. It points out the errors, so you can fix them manually with full control.
4. Can I beautify my JSON after validation?
Yes! Use our JSON Formatter tool to beautify your JSON once it is valid.
How JSON Validation Helps Developers
When building APIs, web applications, or mobile apps, a small JSON syntax error can cause major failures. A JSON validator saves time by highlighting exact issues early, preventing bugs, crashes, or failed integrations in production systems. Regularly validating JSON ensures smooth data communication between front-end and back-end services.
Advanced Validation Tips
- Always validate external JSON responses before processing them in your applications.
- Check for correct nesting of objects and arrays in deeply structured JSON.
- Ensure that numerical values are not mistakenly quoted as strings if you expect integers or floats.
- Make sure boolean values are lowercase: true, false (not True, False).
- When working with dates, prefer using ISO 8601 standard formats inside JSON.
More Frequently Asked Questions (FAQs)
5. Does the validator support nested JSON objects?
Yes! The validator fully supports nested structures — objects inside arrays, arrays inside objects, and multiple levels of nesting.
6. What should I do if my JSON is invalid?
Our tool highlights the exact error location. Carefully fix the syntax mistake — like missing quotes, misplaced commas — and validate again.
7. Can I use comments inside JSON?
No, standard JSON does not allow comments. Remove any comments before validation to ensure correctness.
8. Why are double quotes mandatory in JSON?
According to JSON standards (RFC 8259), property names (keys) and string values must be enclosed in double quotes for proper parsing.