JSON Validator Guide

A JSON validator helps you check if your JSON data is correctly formatted and follows the JSON specification.

Why Validate JSON?

1. Catch Syntax Errors

Before your application crashes!

2. Ensure Data Integrity

Make sure data structure is correct

3. Debug Faster

Identify exact location of errors

4. API Compatibility

Ensure your JSON works with APIs

Common JSON Errors

1. Trailing Commas

❌ Invalid:

{
  "name": "John",
  "age": 30,
}

✅ Valid:

{
  "name": "John",
  "age": 30
}

2. Single Quotes

❌ Invalid:

{
  'name': 'John'
}

✅ Valid:

{
  "name": "John"
}

3. Missing Commas

❌ Invalid:

{
  "name": "John"
  "age": 30
}

✅ Valid:

{
  "name": "John",
  "age": 30
}

4. Unquoted Keys

❌ Invalid:

{
  name: "John"
}

✅ Valid:

{
  "name": "John"
}

5. Mismatched Brackets

❌ Invalid:

{
  "items": [1, 2, 3}
}

✅ Valid:

{
  "items": [1, 2, 3]
}

How to Use Our Validator

Step 1: Input JSON

• Paste your JSON
• Upload a file
• Import from URL

Step 2: Validate

Click "Validate" button

Step 3: Review Results

• ✅ Valid: Your JSON is correct!
• ❌ Invalid: See error details

Step 4: Fix Errors

Our validator shows:

• Line number of error
• Column number of error
• Error description
• Suggested fix

Advanced Validation

Schema Validation

Validate against JSON Schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "age": {
      "type": "number",
      "minimum": 0
    }
  },
  "required": ["name", "age"]
}

Use our Schema Generator to create schemas!

Validation in Code

JavaScript

try {
  JSON.parse(jsonString);
  console.log("Valid JSON");
} catch (error) {
  console.error("Invalid JSON:", error.message);
}

Python

import json

try:
    json.loads(json_string)
    print("Valid JSON")
except json.JSONDecodeError as e:
    print(f"Invalid JSON: {e}")

Best Practices

1. Validate before sending to APIs
2. Validate after receiving from external sources
3. Use automated validation in CI/CD
4. Implement error handling
5. Log validation errors for debugging

Tools Integration

VS Code

Install JSON validation extensions

Command Line

# Using jsonlint
jsonlint myfile.json

Online Validator

Use our JSON Validator - no installation needed!

Security Considerations

1. Validate untrusted input
2. Check data types
3. Limit JSON size
4. Prevent injection attacks
5. Use schema validation

Try our JSON Validator now - instant validation with detailed error messages!