Converters
JSON to TypeScript Converter
Generate TypeScript interfaces from a JSON sample.
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TypeScript interfaces
About the JSON to TypeScript Converter
Generate TypeScript interfaces from a sample JSON object or array, including nested objects.
Paste an API response or config sample and get typed interfaces you can drop straight into your code.
A big time saver when wiring up a typed client for a new endpoint.
Key features
- Interfaces for nested objects
- Infers string, number, boolean and array types
- Open a file or paste your JSON
- Copy the result instantly
How to use
- 1Paste a representative JSON sample.
- 2Read the generated TypeScript interfaces.
- 3Copy them into your project.
Examples
Object to interface
Input:
{"id":1,"name":"Ada"}Output:
export interface Root {
id: number;
name: string;
}Each key becomes a typed property in the interface.
Nested object
Input:
{"user":{"id":1}}Output:
export interface User {
id: number;
}
export interface Root {
user: User;
}Nested objects get their own named interface.
Frequently asked questions
- How are arrays typed?
- The type of the first element is used, so an array of objects produces a typed interface for that object.
- What about optional or mixed fields?
- Types come from the sample you paste, so include a representative example. Mixed or missing fields may need manual tweaks.
- Is my data uploaded?
- No. The generation runs entirely in your browser.