Free JSON Validator
4.9/5 Rating

JSON Validator

Quickly Validate and Check Your JSON Data for Errors

Ensure your JSON data is syntactically correct with our comprehensive validator. Detect errors, get precise line numbers, and debug issues quickly for APIs, configuration files, and data exchange.

Free & Unlimited
Secure Processing
Lightning Fast

Validate JSON Data

Check your JSON syntax and get detailed error reporting with line numbers

How to Validate JSON Data

Follow these simple steps to check your JSON syntax and identify errors

1

Paste JSON Data

Copy and paste your JSON data into the input area or load a sample to test the validator.

2

Run Validation

Click the validate button to check your JSON syntax and identify any errors or issues.

3

Fix Issues

Review the validation results and fix any reported errors using the provided line numbers.

Why Choose Our JSON Validator

Professional-grade features for comprehensive JSON syntax validation and error detection

Precise Validation

Comprehensive syntax checking with detailed error reporting and exact line number identification.

Privacy Protected

All JSON validation is done locally - your data never leaves your device.

Instant Results

Real-time JSON validation with immediate error detection and detailed feedback.

Error Details

Get specific error messages with line numbers and character positions for quick debugging.

Mobile Ready

Fully responsive design works perfectly on smartphones, tablets, and desktops.

Developer Essential

Critical tool for API development, configuration validation, and data quality assurance.

Common JSON Validation Errors

Learn about frequent JSON syntax issues and how to fix them

Error TypeExampleFixDescription
Missing Comma"name": "John" "age": 30"name": "John", "age": 30Add comma between properties
Trailing Comma["a", "b", "c",]["a", "b", "c"]Remove trailing comma
Unquoted Keys{name: "John"}{"name": "John"}Quote all property names

Frequently Asked Questions

Get answers to common questions about JSON validation and syntax checking

1

What makes JSON valid or invalid?

Valid JSON requires proper syntax: quoted strings, correct bracket/brace matching, no trailing commas, and proper data types. Our validator checks all these rules and provides specific error locations.

2

How does JSON validation help in development?

JSON validation prevents runtime errors, ensures API compatibility, and helps debug data exchange issues. It's essential for configuration files, API responses, and data storage.

3

Can the validator detect specific error locations?

Yes, our validator provides detailed error messages including line numbers and character positions to help you quickly identify and fix JSON syntax issues.

4

What are common JSON validation errors?

Common errors include missing commas, unmatched brackets, unquoted property names, trailing commas, and incorrect string escaping. Our validator identifies these specific issues.

5

Is my JSON data secure during validation?

Absolutely. All JSON validation is performed locally in your browser. Your data never leaves your device and is not transmitted to any servers.

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