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API Documentation with OpenAPI and Swagger

Create comprehensive API documentation with OpenAPI/Swagger. Learn schema design, code generation, and documentation best practices.

B
Bootspring Team
Engineering
February 26, 2026
1 min read

Good API documentation improves developer experience. This guide covers creating comprehensive documentation with OpenAPI.

Basic OpenAPI Structure#

1openapi: 3.1.0 2info: 3 title: My API 4 version: 1.0.0 5 6paths: 7 /users: 8 get: 9 summary: List users 10 responses: 11 '200': 12 description: Success 13 content: 14 application/json: 15 schema: 16 type: array 17 items: 18 $ref: '#/components/schemas/User' 19 20components: 21 schemas: 22 User: 23 type: object 24 properties: 25 id: 26 type: string 27 name: 28 type: string

Code Generation#

# Generate TypeScript types npx openapi-typescript openapi.yaml -o ./src/types/api.ts

Swagger UI Integration#

import swaggerUi from 'swagger-ui-express'; import spec from './openapi.yaml'; app.use('/docs', swaggerUi.serve, swaggerUi.setup(spec));

Write clear descriptions, provide examples, and keep documentation in sync with code.

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