OpenAPI to TypeScript Generator

Convert OpenAPI 3.x and Swagger 2.0 schema definitions into clean, strongly-typed TypeScript interfaces directly in your browser.

At a glance

OpenAPI to TypeScript Generator is a free client-side tool that compiles OpenAPI 3.0, 3.1, and Swagger 2.0 schemas into strongly-typed TypeScript interfaces. It resolves local $ref pointers, allOf compositions, oneOf unions, and nullable types. Zero server uploads — everything compiles in browser memory.

Developer Suite: OpenAPI to TypeScript JSON to OpenAPI JSON Schema to TS Proto to TS Proto to Zod GraphQL to TS Avro to TS

100% Client-Side In-Browser OpenAPI & Swagger Type Generator

OpenAPI 3.0, 3.1, and Swagger 2.0 schemas compile into TypeScript interfaces locally in your browser memory. Zero code or schema uploads.

Pure In-Browser
Sample Presets:
Valid OpenAPI 0 chars
Resolves $ref pointers, allOf compositions, and nullable types
0 B
Interfaces Created
0
Enums Defined
0
Output Target
TypeScript 5.x
Execution
100% Client-Side

How OpenAPI to TypeScript Generation Works

Consuming RESTful APIs in modern frontend frameworks (React, Vue, Svelte) and Node.js microservices requires clean, strongly-typed data contracts. This tool parses OpenAPI 3.0, OpenAPI 3.1, and Swagger 2.0 schemas directly in your browser memory and generates idiomatic TypeScript interfaces.

$ref Pointer Resolution

Resolves internal pointers (#/components/schemas/Model or #/definitions/Model) and seamlessly links generated TypeScript types across models.

allOf & oneOf Composition

Translates allOf into interface extension or type intersections (&), and oneOf / anyOf into union types (|).

Strict Nullability & Optionality

Faithfully honors schema required arrays for optional fields (?), and compiles OpenAPI 3.0 nullable: true as well as OpenAPI 3.1 multi-types.

Why Use This OpenAPI to TypeScript Generator?

100% Client-Side Privacy: Your proprietary REST API models and schemas never leave your local device.
Multi-Version Support: Seamlessly handles OpenAPI 3.0, OpenAPI 3.1, and legacy Swagger 2.0 definitions.
Pointers & Composition: Resolves local $ref references, allOf inheritance, and oneOf/anyOf union declarations.
Configurable Output: Select between interface or type alias declarations, enums, and readonly modifiers.

How to Use OpenAPI to TypeScript Generator

1

Paste OpenAPI / Swagger Definition

Enter your OpenAPI 3.x or Swagger 2.0 JSON or drop an .json/.yaml file into the editor.

2

Configure TypeScript Options

Choose between interface or type alias declarations, toggle readonly properties, and select enum style.

3

Copy or Download TypeScript

Review the generated TypeScript type definitions, copy to your clipboard, or export as a .ts file.

OpenAPI 3.0 Schema to TypeScript Interface

Compiles the OpenAPI 3.0 User schema into a strongly-typed TypeScript interface with exact required and optional fields.

OpenAPI Schema Definition (JSON) Source 
{
  "components": {
    "schemas": {
      "User": {
        "type": "object",
        "required": ["id", "username"],
        "properties": {
          "id": { "type": "integer" },
          "username": { "type": "string" },
          "email": { "type": "string" }
        }
      }
    }
  }
}
Generated TypeScript Interface Processed 
export interface User {
  id: number;
  username: string;
  email?: string;
}

Technical Specifications & Engine Details

Technical specifications and engine details for OpenAPI to TypeScript Generator
Specification Details
Supported Formats APPLICATION/JSON, TEXT/PLAIN, .JSON, .TXT → TEXT/TYPESCRIPT, TEXT/PLAIN, .TS, .D.TS
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Requires modern web browser with ECMAScript 6+ and standard DOM Web APIs.
Performance Constraints Runs 100% client-side in browser memory. Performance bounded by local device RAM.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

Your files remain strictly on your local device. Zero data is transmitted to external servers.

Frequently Asked Questions

Are my API specifications uploaded to an external server?
No. All schema parsing and TypeScript compilation execute 100% locally in your web browser. Your private API endpoints, models, and contracts never leave your local device.
Does it support OpenAPI 3.0, 3.1, and Swagger 2.0?
Yes. The compiler supports OpenAPI 3.0 and 3.1 (components.schemas) as well as legacy Swagger 2.0 (definitions) schema collections.
How does the tool resolve $ref pointers?
The compiler evaluates internal $ref pointers (such as #/components/schemas/ModelName or #/definitions/ModelName) and replaces them with references to the corresponding generated TypeScript type.
Does it support allOf and oneOf schema composition?
Yes. allOf compositions compile into interface inheritance or type intersections (&), while oneOf and anyOf compile into TypeScript union types (|).

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated .

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