Generate TypeScript interfaces and types from JSON data structures
Need to convert TypeScript into JSON Schema?
Capture TS models as JSON Schema definitions.
Generate interfaces instead of type aliases
Mark properties as optional when they might be undefined
Add JSON data to generate TypeScript types
Generates interfaces, types, and strongly-typed objects
Use this JSON to TypeScript generator to create type-safe interfaces and types from JSON samples for frontend apps and Node.js services.
Step 1 – Paste a JSON sample
Import to load JSON from a file, URL, or sample data.Step 2 – Choose TypeScript generation options
Root Type Name that matches your model (for example Root).Optional (?) vs Union (| null)) to match your codebase.interfaces or type aliases for the output.Step 3 – Review the generated code
Root Type Name, null handling, and frameworks if available.Step 4 – Use the generated types
Step 5 – Copy or download
Quick tips
unknown for truly untyped fields, then narrow as you validate.// JSON input
{
"id": 123,
"name": "Maeve Winters",
"email": "maeve@example.com",
"active": true,
"roles": ["admin", "editor"],
"metadata": { "plan": "pro" },
"createdAt": "2024-03-01T10:15:00Z",
"score": 99.5,
"notes": null
}
// Generated TypeScript types (simplified)
export interface Metadata {
plan: string;
}
export interface Root {
id: number;
name: string;
email: string | null;
active: boolean;
roles: string[];
metadata: Metadata;
createdAt: string;
score: number;
notes: null;
}Explore more JSON and schema tools that work great alongside this JSON to TypeScript generator.
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The generator creates TypeScript interfaces, types, and classes with full type safety. It supports optional properties, union types, nested interfaces, array types, and proper null handling. The generated code is compatible with the latest TypeScript standards.
Complex nested objects are converted to separate TypeScript interfaces with proper type relationships. Arrays are typed correctly, and the generator creates a hierarchy of types that matches your JSON structure while maintaining type safety.
Yes, you can choose between different null handling strategies: optional properties with '?', union types with '| null', or ignoring null values entirely. This gives you flexibility in how strict you want your types to be.
Absolutely! The generated code follows TypeScript best practices, includes proper exports, and can be directly imported into your TypeScript projects. The interfaces are designed to be maintainable and follow standard naming conventions.