Generate Strongly Typed TypeScript Interfaces from JSON
Manually writing TypeScript interfaces for complex API payloads is repetitive and prone to subtle type mistakes that cause runtime crashes. Transforming nested JSON responses into clean, strongly typed interface or type declarations accelerates frontend engineering and improves code reliability.
This generator parses your JSON sample data in real time, generates PascalCase interface names, detects optional fields (?), handles nullable values, and maps nested object structures into separate modular interfaces. Everything executes 100% locally in your browser, keeping proprietary API schemas and tokens confidential.
Frequently Asked Questions
Does the generator support nested arrays and heterogeneous types?
Yes. The engine inspects array elements, generating union types (such as Array<string | number>) when values vary, and extracting nested object arrays into separate typed interfaces.
Can I configure between Interface and Type declarations?
Yes. The generated code adheres to standard TypeScript syntax, making it simple to copy directly into your React, Next.js, Node.js, or Vue codebases.
Does this tool send my JSON schema to external servers?
No. All AST parsing and type synthesis execute strictly in your local browser window. No data is logged, tracked, or uploaded.