JSON to TypeScript Converter
Transform raw JSON payloads into strongly-typed TypeScript interfaces or type aliases with automatic nested object inference and downloadable definition files.
export interface Profile {
firstName: string;
lastName: string;
avatarUrl: string;
isVerified: boolean;
}
export interface UserRecord {
id: string;
username: string;
profile: Profile;
roles: string[];
accountBalance: number;
lastLoginAt: number;
}Automate TypeScript Interface Generation From API Responses
Why manual TypeScript typing slows down API integrations
Hand-authoring TypeScript interfaces for complex REST endpoints or third-party webhooks is repetitive and prone to subtle type mismatch bugs. Modifyle inspects live JSON payloads and generates clean, standard TypeScript typings in milliseconds.
Nested objects are cleanly extracted into separate interfaces with proper casing, arrays of objects are inferred accurately, and nullable values are mapped safely to union types.
All conversion executes inside your web browser. You can paste confidential API outputs and user records with full confidence that no bytes leave your device.
What Can You Use This Tool For?
Real-world problems solved and intended workflows for this tool.
Instant TypeScript Interface Generation from API Payloads
Paste live JSON API responses into JSON to TypeScript Type Generator to automatically generate strongly-typed TypeScript interfaces and type definitions.
Nested Object & Array Type Resolution
Accurately infer optional fields, union types, and nested sub-interfaces from complex production JSON payloads.
Client-Side Code Generation Privacy
Convert sensitive internal API response shapes into TypeScript definitions entirely in local browser memory.
How It Works in 3 Simple Steps
Paste Sample JSON
Paste any valid JSON object or array from your API or database.
Configure Naming & Syntax
Set your root interface name and choose between interface or type alias format.
Copy or Download .ts
Copy definitions to your clipboard or download a ready-to-import TypeScript file.
- Processing executes locally in browser memory. Large files depend on available device RAM and CPU capacity.
Why choose Modifyle JSON to TypeScript?
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