Developer tool · Free · No sign-up
JSON to Code Converter
Instantly convert JSON to TypeScript Interfaces or C# Classes.
JSON Input
Generated Code
interface Address {
street: string;
city: string;
}
interface RootObject {
name: string;
age: number;
isActive: boolean;
roles: string[];
address: Address;
}About this tool
Stop writing types and classes by hand. Paste your JSON API response and instantly generate clean TypeScript interfaces or C# classes. Perfect for full-stack developers working across Next.js and .NET.
Key features
TS & C# Toggle
Switch between generating TypeScript interfaces and C# classes instantly.
Nested Object Support
Automatically creates multiple classes/interfaces for deeply nested JSON objects.
Custom Root Naming
Define the root class or interface name to match your domain models.
How to use it
- 1Paste your JSON object into the input area.
- 2Choose your target language (TypeScript or C#).
- 3Enter a root name for your main class/interface.
- 4Click copy to paste the generated code directly into your project.
Common use cases
- Generating C# ViewModels from a frontend API payload.
- Creating TypeScript interfaces for a Next.js app consuming a .NET backend.
- Speeding up API integration by skipping manual type definitions.
Frequently asked questions
Does it handle nested arrays and objects?
Yes, the tool recursively parses your JSON and generates separate classes/interfaces for nested objects, inferring array types from their first element.
What data types are used for C#?
Strings map to 'string', numbers map to 'decimal', booleans map to 'bool', and arrays map to 'List<T>' to ensure compatibility with standard JSON serializers.
Is my JSON data sent to a server?
No. All parsing and code generation happens entirely in your browser. Your data is completely private.
Private and free. Most of our tools run entirely in your browser, so the data you enter isn't uploaded or stored. There's no sign-up, and there never will be — they're built by the Fusion Trail Solutions team to be genuinely useful.
Need a custom tool or web app?
We design and build production-grade web apps, internal tools and SaaS platforms. Tell us what you need.
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