JSON to TypeScript Converter
Convert JSON to TypeScript interfaces or types in your browser. Nested objects, arrays, optional/readonly properties, copy and download .ts — no upload.
Introduction
JSON to TypeScript Converter is a free, browser-based utility in our JSON Tools collection. Paste JSON and generate readable TypeScript interfaces or type aliases. Nested objects become named types, arrays and primitives are inferred, and you can toggle optional properties, readonly fields, semicolons, and indentation. JSON to TypeScript is useful when you have a sample API response and need a starting type for a client or form model. Nested objects are emitted as separate named interfaces/types so the output stays scannable. Treat the result as a scaffold: refine unions, branded IDs, and optionality once you know how payloads vary in production. Pair it with the JSON Schema Generator when you also need a schema for validation. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include interface or type alias output.
Features
- Interface or type alias output
- Named types for nested objects
- Optional and readonly property toggles
- Root name, indentation, and semicolon options
- Format, copy, and download .ts
How to use
- 1Paste a representative JSON sample (or load the example).
- 2Choose interface vs type, root name, and formatting options.
- 3Copy or download the generated TypeScript and refine as needed.
Example
Nested object
Input{"name":"Ali","age":32,"address":{"city":"Islamabad"}}Outputinterface Root {
name: string;
age: number;
address: Address;
}
interface Address {
city: string;
}Benefits
- Run JSON to TS entirely in the browser with no signup or installation.
- Keep sensitive sample data private — processing never leaves your device.
- Interface or type alias output
- Named types for nested objects
- Optional and readonly property toggles
- Pair it with JSON Schema and JSON Formatter when your workflow needs adjacent utilities.
FAQs
Not from a single sample. Turn on Optional properties if you want every field marked optional, or edit the output after comparing multiple payloads.
Empty arrays become unknown[]. Prefer a sample that includes at least one item so item types can be inferred.
Nested objects are promoted to named interfaces/types (for example Address) so the root type stays readable.
No. Conversion runs entirely in your browser.
Yes. JSON to TS on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.
No. JSON to TS runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.
Paste JSON and generate readable TypeScript interfaces or type aliases. Nested objects become named types, arrays and primitives are inferred, and you can toggle optional properties, readonly fields, semicolons, and indentation. It fits everyday json tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.
Core capabilities include: Interface or type alias output; Named types for nested objects; Optional and readonly property toggles; Root name, indentation, and semicolon options.