TypeScript JSON

Can TypeScript automatically generate interfaces from a JSON object?

TypeScript cannot directly generate interfaces from JSON objects at runtime, but several tools automate this conversion. Online tools like quicktype, json2ts, and transform.tools instantly convert JSON to TypeScript interfaces. VS Code extensions like "Paste JSON as Code" generate interfaces from clipboard JSON. For development workflows, use json-schema-to-typescript to generate types from JSON Schema. The json-to-ts npm package provides programmatic conversion in Node.js. These tools analyze JSON structure and infer types, handling nested objects and arrays. For API development, generate types from OpenAPI/Swagger specs using openapi-typescript. Runtime validation libraries like Zod and io-ts infer TypeScript types from runtime validators. For one-off conversions, paste JSON into our JSON Editor at jsonconsole.com/json-editor to visualize structure before copying to type generators. Manual interface creation ensures more accurate types than automated inference for complex domains. Generated types serve as starting points requiring refinement for optional fields, unions, and business logic. Use automation for rapid prototyping and manual typing for production code.
Last updated: December 23, 2025

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