JSON Validator & Formatter
Validate and format your JSON with real-time error checking
Input JSON
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History of JSON
JSON (JavaScript Object Notation) was first specified by Douglas Crockford in the early 2000s. The format was based on a subset of JavaScript's object literal notation, but its usefulness as a language-independent data format led to its widespread adoption. The first JSON message was transmitted in April 2001. Since then, JSON has become the de facto standard for web APIs, replacing XML in many applications due to its simplicity and ease of use.
What is JSON?
JSON is a lightweight, text-based data interchange format that is completely language independent. Despite its derivation from JavaScript, JSON is now used with virtually every programming language. It represents data through a simple notation of key-value pairs and ordered lists, making it both human-readable and machine-parseable.
Why Use JSON?
- Language Independent: Can be used with any programming language
- Self-describing: Data structure is clear and readable
- Lightweight: Minimal overhead in data transmission
- Fast: Easy to parse and generate
- Widely Supported: Built-in support in most modern languages
- Web-friendly: Native support in browsers
- Schema Support: Can be validated against JSON Schema
- Nested Structures: Supports complex data hierarchies
JSON Syntax
JSON syntax is derived from JavaScript object notation, but with some specific rules and restrictions.
Basic Structures
- Object: An unordered collection of key-value pairs
- Array: An ordered list of values
Supported Data Types
- String: Unicode text enclosed in double quotes
- Number: Integer or floating point
- Boolean: true or false
- null: Represents no value
- Object: Collection of key-value pairs
- Array: Ordered list of values
JSON Support in Programming Languages
| Language | Parse Method | Stringify Method |
|---|---|---|
| JavaScript | JSON.parse() | JSON.stringify() |
| Python | json.loads() | json.dumps() |
| Java | ObjectMapper.readValue() | ObjectMapper.writeValueAsString() |
| C# | JsonSerializer.Deserialize() | JsonSerializer.Serialize() |
| Go | json.Unmarshal() | json.Marshal() |
| PHP | json_decode() | json_encode() |
| Ruby | JSON.parse() | JSON.generate() |
| Rust | serde_json::from_str() | serde_json::to_string() |
| Swift | JSONDecoder().decode() | JSONEncoder().encode() |
| Kotlin | Json.decodeFromString() | Json.encodeToString() |