JSON Validator

Validate, debug, and format your JSON data instantly. Free online syntax checker.

Input & Validation

Paste your JSON below to check validity.

Enter JSON and click Validate

Validate & Debug JSON Instantly

Stop guessing where the syntax error is. Our smart JSON validator parses your code in real-time, pointing out exactly where things went wrong. Perfect for debugging APIs, config files, and data payloads.

Valid JSON Check

Why Use This Validator?

Error Detection

Pinpoint syntax errors immediately. We show you the error message to help you fix it fast.

Auto Formatting

Messy code? If your JSON is valid, we automatically beautify it with proper indentation.

Privacy First

Validation runs 100% in your browser. Your sensitive data is never sent to our servers.

Instant feedback

No loading screens. Get validation results instantly as you type or paste your code.

How this JSON Validator works

This data integrity tool verifies JSON document syntax checking for malformed structures, missing brackets, incorrect punctuation, or invalid data types that prevent proper parsing. The validator parses JSON strings reporting specific errors with line numbers and character positions enabling quick identification and correction of issues. Detailed error messages explain problems (unclosed strings, trailing commas, duplicate keys), suggest fixes based on common mistakes, and validate against JSON Schema specifications when provided. Users paste JSON receiving instant validation feedback, schema mode enforces structural requirements ensuring data conforms to expected formats, and batch validation processes multiple files identifying problematic documents. Visualization features highlight error locations with syntax coloring, comparison modes validate JSON equality accounting for property order differences, and formatting options beautify valid JSON for easier inspection. Applications include debugging API integration failures caused by malformed responses, validating user-generated JSON preventing application crashes, testing configuration files before deployment, or ensuring data exports meet specification requirements for third-party systems accepting only valid JSON.

How to Use

1

Paste JSON

Enter your JSON string or object into the input field.

2

Validate

Click the button to instantly check for syntax errors.

3

Format

If valid, copy the beautified JSON for your project.

Example Usage

Example input:

Input
{"name": "John", "age": 30}
Output
Valid JSON

Frequently Asked Questions

Is my data safe?
Yes, validation happens entirely in your browser. No data is sent to any server.
Does it format JSON?
Yes, if the JSON is valid, we automatically format it with 2-space indentation for readability.
Why is my JSON invalid?
Common issues include missing quotes around keys, trailing commas, or using single quotes instead of double quotes.

Related Tools

The JSON Validator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.