Prettify JSON
Format and beautify JSON code
Validate JSON
Check if JSON is valid and well-formed.
JSON Tools
What is JSON Validation?
JSON (JavaScript Object Notation) is a lightweight data-interchange format. JSON validation ensures that the structure of the data conforms to the JSON standard. A valid JSON object must have: - Property names enclosed in double quotes. - Properly balanced curly braces curly braces. - No trailing commas after the last key-value pair. - Proper nesting of objects and arrays. This tool checks the input JSON and provides feedback to help identify and fix common errors.
Input JSON
Validation Result
Validate JSON Examples
Valid JSON Object
This example shows a correctly formatted JSON object. All property names and string values are enclosed in double quotes, and the overall structure is properly balanced with opening and closing braces.
Input
{
"name": "John",
"age": 30,
"city": "New York"
}
{
"name": "John",
"age": 30,
"city": "New York"
}
Output
✅ Valid JSON
✅ Valid JSON
Invalid JSON Missing Quotes
This example demonstrates an invalid JSON object where the property names are not enclosed in double quotes. According to the JSON standard, property names must always be enclosed in double quotes. Omitting the quotes will result in a syntax error.
Input
{
name: "John",
age: 30,
city: "New York"
}
{
name: "John",
age: 30,
city: "New York"
}
Output
❌ Error: Expected property name or '}' in JSON
❌ Error: Expected property name or '}' in JSON
Invalid JSON with Trailing Comma
This example shows an invalid JSON object with a trailing comma after the last key-value pair. In JSON, trailing commas are not allowed because they create ambiguity when parsing the data structure.
Input
{
"name": "John",
"age": 30,
"city": "New York",
}
{
"name": "John",
"age": 30,
"city": "New York",
}
Output
❌ Error: Expected double-quoted property name
❌ Error: Expected double-quoted property name