TypeScript to OpenAPI Schema Generator

Convert TypeScript interfaces and type definitions into OpenAPI 3.0 and 3.1 YAML or JSON schemas in your browser.

At a glance

TypeScript to OpenAPI Generator converts TypeScript interfaces and type aliases into OpenAPI 3.0 and 3.1 schema components. It analyzes scalar primitives, optional properties, array types, literal enums, and JSDoc annotations, compiling them into formatted YAML or JSON OpenAPI components client-side.

Universal Switcher:
From:
To:
Developer Suite: TS to OpenAPI OpenAPI to TS TS to JSON Schema TS to Zod Zod to OpenAPI JSON to OpenAPI

100% Client-Side In-Browser TypeScript to OpenAPI Schema Generator

Compile TypeScript interfaces and type aliases into OpenAPI 3.0 / 3.1 YAML and JSON schema components directly in browser memory. Zero network traffic or cloud uploads.

Pure In-Browser
Presets:
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OpenAPI Generation Options
Valid OpenAPI 3.0 Specification
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Why Use This TypeScript to OpenAPI Schema Generator?

100% Client-Side Conversion: All TypeScript AST parsing and OpenAPI generation runs locally in your browser with zero network latency.
OpenAPI 3.0 & 3.1 Dual Support: Generate schemas with OpenAPI 3.0 nullable attributes or modern OpenAPI 3.1 null type unions.
YAML and JSON Serialization: Toggle effortlessly between standard OpenAPI YAML and formatted JSON representations.
JSDoc Tag Integration: Automatically maps JSDoc comments to descriptions, @format tags to OpenAPI formats, and @example to schema examples.
Optional Property Analysis: Excludes optional fields (prop?: type) from the required properties array automatically.

How to Use TypeScript to OpenAPI Schema Generator

1

Paste TypeScript Source Code

Enter or paste your TypeScript interfaces, types, or enums into the input editor.

2

Configure OpenAPI Options

Select your target OpenAPI version (3.0 vs 3.1), output format (YAML vs JSON), and custom API title.

3

Copy or Download Specification

Copy the generated OpenAPI schema or download it as a .yaml or .json file ready for Swagger UI or API gateways.

TypeScript Interface to OpenAPI 3.0 Schema

Demonstrates compiling a TypeScript interface into an OpenAPI object component with required properties and enum values.

TypeScript Interface Source 
interface UserProfile {
  id: string;
  email: string;
  role: "admin" | "member";
  bio?: string;
}
OpenAPI YAML Component Processed 
UserProfile:
  type: object
  properties:
    id:
      type: string
    email:
      type: string
    role:
      type: string
      enum:
        - admin
        - member
    bio:
      type: string
  required:
    - id
    - email
    - role

Technical Specifications & Engine Details

Technical specifications and engine details for TypeScript to OpenAPI Schema Generator
Specification Details
Supported Formats TEXT → TEXT
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Modern browser with JavaScript enabled.
Performance Constraints Zero external dependencies. Runs 100% client-side in browser memory.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

Your files and data remain strictly on your local device. Computations run locally using browser memory with zero network uploads.

Frequently Asked Questions

How does the tool determine required properties in OpenAPI?
Properties without the question mark modifier (e.g. name: string) are automatically collected into the schema required array, while optional fields (bio?: string) are omitted.
What is the difference between OpenAPI 3.0 and 3.1 output?
OpenAPI 3.0 represents nullable types using nullable: true, whereas OpenAPI 3.1 uses JSON Schema-compliant type arrays such as type: ["string", "null"].
Does this generator support string literal enums?
Yes. Union types containing string literals (e.g. admin or user) are automatically translated into OpenAPI string enums.
Is my TypeScript code private?
Yes. 100% of the TypeScript parsing and YAML/JSON generation occurs in your browser sandbox. No source code is ever sent to external servers.

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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