Code to JSON: Mock Data & Serialization

Paste a class, struct or interface and get realistic mock JSON, plus ready-to-run serialization snippets for TypeScript, Java, C#, Python, Go, Kotlin, Swift, Dart and PHP.

TypeScript to JSON
Mock JSON, JSON Schema and snippets from TypeScript interfaces.
Java to JSON
Mock JSON from Java classes plus Jackson and Gson snippets.
C# to JSON
Mock JSON from C# classes and JsonSerializer snippets.
Python to JSON
Mock JSON from Python classes plus json.dumps snippets.
Go to JSON
Mock JSON from Go structs and json.Marshal snippets.
Kotlin to JSON
Mock JSON from Kotlin data classes plus serializer snippets.
Swift to JSON
Mock JSON from Swift Codable types plus JSONEncoder snippets.
Dart to JSON
Generate toJson() and jsonEncode code from a Dart class.
PHP to JSON
Mock JSON from PHP classes plus json_encode snippets.

More JSON tools: JSON Spreadsheet & Document Converters · JSON Data Format Converters · JSON to Code Generators · JSON Schema, GraphQL & Database Tools · JSON Tools & Utilities

All JSONSwitcher converters are free, need no account and process your data locally in your browser with JavaScript — nothing is uploaded to a server.

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