JSON Schema to TypeScript Converter

Convert JSON Schema (draft-07) definitions to TypeScript interfaces with AI — free, instant, no login required.

JSON Schema to TypeScript conversion generates typed interface definitions directly from your schema — including required/optional fields, enums, and nested objects. Paste any JSON Schema and get a production-ready TypeScript interface in seconds.

Paste your code, then click Convert

Typescript

How to use this tool?

This online converter harnesses AI to generate TypeScript interfaces from JSON Schema definitions. Follow these steps:

Type or paste your JSON Schema (draft-07) into the input box provided.
Click the "Convert" button to generate a matching TypeScript interface.
View the TypeScript interface in the output box, with required/optional fields inferred from the schema's "required" array.

Example: Simple Function

JSON Schema

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "number" },
    "active": { "type": "boolean" }
  },
  "required": ["name", "age"]
}

TypeScript

export interface Root {
  name: string
  age: number
  active?: boolean
}

How to Generate TypeScript Interfaces from JSON Schema

Writing TypeScript interfaces by hand from a JSON Schema means manually tracking which fields are required, mapping enum values to unions, and resolving nested "$ref"-style objects — easy to get wrong on any schema with more than a few fields.

This converter automates it. Paste any JSON Schema (draft-07) and get a TypeScript interface with correct required/optional markers, enum unions, and nested interface declarations — in seconds.

Why Use a JSON Schema to TypeScript Converter?

→Get interfaces that match validation rules exactly — required fields stay required, not inferred from a single example
→Turn OpenAPI/Swagger schema components into typed interfaces without a build step
→Convert enum constraints directly to TypeScript union types
→Skip installing and configuring a CLI codegen tool for a one-off schema

What the JSON Schema to TypeScript Converter Handles

Primitive types (string, number, boolean)

Required vs. optional field inference

Nested object interfaces

Array and items type resolution

Enum to union type conversion

Draft-07 JSON Schema syntax

null / undefined handling

Interface naming from schema title

OpenAPI schema components

API contract definitions

Config schema validation shapes

Multi-level nested schemas

From JSON Schema to TypeScript Interface — How It Works

A JSON Schema to TypeScript converter reads a schema's properties, required, and items definitions and outputs a matching interface. A required string property becomes name: string; an optional one becomes name?: string. Nested object schemas become separate interfaces, and array schemas become items: Item[]. This is the reverse of generating a schema from JSON — pick the direction that matches your workflow.

JSON → JSON Schema

Generate schema from a JSON example

JSON → TypeScript

Infer types from JSON data directly

OpenAPI → TypeScript

Full API spec to typed interfaces

Frequently Asked Questions

What is JSON Schema to TypeScript conversion?

JSON Schema to TypeScript conversion generates TypeScript interface definitions from a JSON Schema (draft-07) document. The converter maps each schema type — string, number, boolean, object, array — to its TypeScript equivalent, and marks fields as optional unless listed in the schema's "required" array.

How are required and optional fields handled?

Fields listed in the schema's "required" array become non-optional TypeScript properties. All other fields get a "?" modifier, making them optional in the generated interface.

Does the converter handle nested JSON Schema objects?

Yes. Nested "object" schemas are converted to separate named TypeScript interfaces, linked by type reference from the parent interface.

Can it convert JSON Schema enums?

Yes. "enum" fields in JSON Schema are converted to TypeScript union types of literal values, e.g. "active" | "inactive".

Does it support JSON Schema arrays?

Yes. Schemas with "type": "array" and an "items" definition are converted to typed TypeScript arrays such as string[] or YourInterface[].

Is this tool free?

Yes, completely free with no account required.

Does JS2TS store my schema data?

No. Your data is processed in real time and never stored or logged on our servers.

What is the difference between JSON to TypeScript and JSON Schema to TypeScript?

JSON to TypeScript infers types from example data values. JSON Schema to TypeScript reads an explicit schema definition — including required fields, enums, and format constraints — producing a more precise interface than inference from a single example.

Is this similar to the ts-json-schema-generator npm package?

ts-json-schema-generator runs the opposite direction — it generates JSON Schema from existing TypeScript types via a CLI. This tool converts JSON Schema to TypeScript interfaces directly in the browser, with no install or build step required.

Can I convert an OpenAPI schema component to TypeScript this way?

Yes, for individual schema objects. For a full OpenAPI spec with multiple paths and components, use the dedicated OpenAPI to TypeScript converter instead.