openapi-spec-generation
Generate and maintain OpenAPI 3.1 specifications from code, design-first specs, and validation patterns.
What this skill does
# OpenAPI Spec Generation
Patterns for creating and validating OpenAPI 3.1 specifications.
## When to Use
- Creating API documentation from scratch
- Generating OpenAPI specs from existing code
- Designing API contracts (design-first approach)
- Validating API implementations against specs
- Generating client SDKs from specs
## Core Concepts
### OpenAPI 3.1 Structure
```yaml
openapi: 3.1.0
info:
title: API Title
version: 1.0.0
servers:
- url: https://api.example.com/v1
paths:
/resources:
get: ...
components:
schemas: ...
securitySchemes: ...
```
### Design Approaches
| Approach | Description | Best For |
| ---------------- | ---------------------------- | ------------------- |
| **Design-First** | Write spec before code | New APIs, contracts |
| **Code-First** | Generate spec from code | Existing APIs |
| **Hybrid** | Annotate code, generate spec | Evolving APIs |
## Quick Reference
### Common Components
```yaml
components:
schemas:
User:
type: object
required: [id, email]
properties:
id: { type: string, format: uuid }
email: { type: string, format: email }
parameters:
PageParam:
name: page
in: query
schema: { type: integer, minimum: 1, default: 1 }
responses:
NotFound:
description: Resource not found
content:
application/json:
schema: { $ref: '#/components/schemas/Error' }
```
### Authentication Patterns
```yaml
components:
securitySchemes:
BearerAuth:
type: http
scheme: bearer
bearerFormat: JWT
ApiKeyAuth:
type: apiKey
in: header
name: X-API-Key
security:
- BearerAuth: []
```
## Validation Commands
```bash
# Validate spec
npx @stoplight/spectral-cli lint openapi.yaml
# Generate TypeScript client
npx openapi-generator-cli generate \
-i openapi.yaml \
-g typescript-axios \
-o ./generated-client
# Generate server stub
npx openapi-generator-cli generate \
-i openapi.yaml \
-g nodejs-express-server \
-o ./generated-server
```
## Best Practices
1. **Use $ref extensively** — DRY principle for schemas
2. **Include examples** — Real data helps consumers
3. **Document errors** — All possible error responses
4. **Version in URL** — `/v1/`, `/v2/` for breaking changes
5. **Use operationId** — Unique, descriptive IDs for SDK generation
---
_For detailed templates, see [templates.md](./templates.md)_
_For validation patterns, see [validation.md](./validation.md)_
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