Orionjs provides a clean and type-safe way to define HTTP routes through the @Routes() and @Route() decorators. This approach allows you to organize your API endpoints in controller classes with dependency injection support.

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Creating a Routes Controller

A routes controller is a class decorated with @Routes() that contains methods decorated with @Route() to define individual endpoints: 
import { Route, Routes, createRoute } from '@orion-js/http'
import { Inject } from '@orion-js/services'
import { ExampleService } from '../services/ExampleService'

@Routes()
export default class ExampleRoutes {
  @Inject(() => ExampleService)
  private exampleService: ExampleService

  @Route()
  example = createRoute({
    path: '/example/:exampleId',
    method: 'get',
    resolve: async (req) => {
      const { exampleId } = req.params
      return {
        body: await this.exampleService.getAExample(exampleId)
      }
    }
  })
}

​
Route Definition Options

The createRoute() function accepts the following options: 
@Route()
exampleRoute = createRoute({
  path: '/api/users',           // Path of the endpoint
  method: 'post',               // HTTP method (get, post, put, delete, all)
  bodyParams: {                 // Schema for body parameters (optional)
    name: { type: String },
    email: { type: String }
  },
  queryParams: {                // Schema for query parameters (optional)
    limit: { type: Number }
  },
  returns: {                    // Schema for return value (optional)
    userId: { type: String }
  },
  middlewares: [authMiddleware], // Express middlewares to apply (optional)
  resolve: async (req) => {
    // Route implementation
    return {
      body: { result: 'success' }
    }
  }
})

​
Available Options

OptionTypeDescription
pathstringURL path pattern for the route (supports Express path parameters)
method'get' | 'post' | 'put' | 'delete' | 'all'HTTP method to handle
bodyParamsObject | SchemaSchema for validating request body
queryParamsObject | SchemaSchema for validating query parameters
returnsObject | SchemaSchema for validating response body
middlewaresArray<RequestHandler>Express middlewares to apply to this route
resolveFunctionFunction that handles the request and returns a response
appexpress.ApplicationOptional custom Express app instance

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Route Handlers

Route handlers (the resolve function) receive the request object and any middleware-injected properties: 
@Route()
getUsers = createRoute({
  path: '/users',
  method: 'get',
  resolve: async (req) => {
    const users = await this.userService.getUsers()
    return {
      body: users
    }
  }
})

​
Handler Parameters

Route handlers typically receive:
  • req: Express Request object with params, query, and body
  • Any context injected by middleware (like viewer, authenticated user)

​
Return Values

Route handlers should return an object with: 
return {
  statusCode: 201,                       // Optional status code (defaults to 200)
  headers: {'X-Custom-Header': 'value'}, // Optional headers
  body: {result: 'success'}              // Response body (will be JSON-serialized if object)
}
You can also access the Express response object through the request: 
@Route()
downloadFile = createRoute({
  path: '/download/:fileId',
  method: 'get',
  resolve: async (req) => {
    const res = req.res
    res.setHeader('Content-Type', 'application/pdf')
    res.setHeader('Content-Disposition', 'attachment; filename="report.pdf"')
    
    const fileStream = await this.fileService.getFileStream(req.params.fileId)
    fileStream.pipe(res)
    
    // No body needed when using res directly
    return {}
  }
})

​
Route Parameters

You can access route parameters through the request object, and they will be type-safe if you specify the path with parameter placeholders: 
// Route defined as: /users/:userId/posts/:postId
@Route()
getPost = createRoute({
  path: '/users/:userId/posts/:postId',
  method: 'get',
  resolve: async (req) => {
    const {userId, postId} = req.params
    const post = await this.postService.getPost(userId, postId)
    
    return {
      body: post
    }
  }
})

​
Query Parameters

You can define and validate query parameters using the queryParams option: 
// GET /search?term=example&limit=10
@Route()
search = createRoute({
  path: '/search',
  method: 'get',
  queryParams: {
    term: { type: String },
    limit: { type: Number, optional: true }
  },
  resolve: async (req) => {
    // req.query will be validated and typed according to schema
    const {term, limit} = req.query
    const results = await this.searchService.search(term, limit || 10)
    
    return {
      body: results
    }
  }
})

​
Request Body

You can define and validate request body parameters using the bodyParams option: 
@Route()
createUser = createRoute({
  path: '/users',
  method: 'post',
  bodyParams: {
    name: { type: String },
    email: { type: String },
    age: { type: Number, optional: true }
  },
  returns: {
    userId: { type: String },
    createdAt: { type: Date }
  },
  resolve: async (req) => {
    // req.body will be validated and typed according to schema
    const userData = req.body
    const newUser = await this.userService.createUser(userData)
    
    return {
      statusCode: 201,
      body: newUser // Response will be validated against returns schema
    }
  }
})

​
Error Handling

Orionjs automatically handles errors thrown in route handlers: 
@Route()
getProtectedResource = createRoute({
  path: '/protected-resource',
  method: 'get',
  resolve: async (req) => {
    if (!req.headers.authorization) {
      throw new Error('Unauthorized')
      // Or use a custom error class
      // throw new AuthenticationError('Missing authentication')
    }
    
    return {
      body: await this.resourceService.getResource()
    }
  }
})

​
Example: File Uploads

For handling file uploads, you could use the multer middleware: 
import multer from 'multer'

const upload = multer({ dest: 'uploads/' })

@Routes()
export class FileRoutes {
  @Inject(() => FileService)
  private fileService: FileService

  @Route()
  uploadFile = createRoute({
    path: '/upload',
    method: 'post',
    middlewares: [upload.single('file')],
    resolve: async (req) => {
      // Access the file via req.file
      const fileInfo = await this.fileService.saveFile(req.file)
      
      return {
        statusCode: 201,
        body: fileInfo
      }
    }
  })
}

​
CORS and Security

There are two ways to apply middleware in Orionjs:

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1. Route-Specific Middleware

Apply middleware to specific routes using the middlewares option: 
import cors from 'cors'

@Routes()
export class ApiRoutes {
  @Route()
  getData = createRoute({
    path: '/api/data',
    method: 'get',
    middlewares: [
      cors({
        origin: 'https://example.com',
        methods: ['GET'],
        allowedHeaders: ['Content-Type', 'Authorization']
      })
    ],
    resolve: async (req) => {
      return {
        body: await this.dataService.getData()
      }
    }
  })
}

​
2. Global Middleware

Apply middleware to all routes using the HTTP app: 
import {app} from '@orion-js/http'
import helmet from 'helmet'
import cors from 'cors'

// Apply security headers
app.use(helmet())

// Apply CORS for all routes
app.use(cors({
  origin: ['https://example.com', 'https://admin.example.com'],
  methods: ['GET', 'POST', 'PUT', 'DELETE'],
  allowedHeaders: ['Content-Type', 'Authorization']
}))

​
Custom Response Types

You can define custom response formats for non-JSON responses: 
@Route()
getXML = createRoute({
  path: '/data.xml',
  method: 'get',
  resolve: async (req) => {
    const xml = await this.xmlService.generateXML()
    
    return {
      headers: {
        'Content-Type': 'application/xml'
      },
      body: xml
    }
  }
})

​
Authentication and Authorization

You can implement authentication and authorization using middleware: 
// Auth middleware
const authMiddleware = async (req, res, next) => {
  const token = req.headers.authorization?.split(' ')[1]
  
  if (!token) {
    return res.status(401).json({error: 'No token provided'})
  }
  
  try {
    const user = await verifyToken(token)
    req.user = user // Attach user to request
    next()
  } catch (error) {
    return res.status(401).json({error: 'Invalid token'})
  }
}

@Routes()
export class UserRoutes {
  @Inject(() => UserService)
  private userService: UserService

  @Route()
  getProfile = createRoute({
    path: '/profile',
    method: 'get',
    middlewares: [authMiddleware],
    resolve: async (req) => {
      // req.user is guaranteed to exist from the authMiddleware
      return {
        body: await this.userService.getUserProfile(req.user._id)
      }
    }
  })
}

​
Starting the HTTP Server

To start the HTTP server: 
import {startServer} from '@orion-js/http'

// Start HTTP server
startServer({
  port: 3000,
  path: '/',
  onStart: () => {
    console.log('Server started on port 3000')
  }
})

​
Best Practices

  1. Organize by Domain: Group related routes in the same controller class.
  2. Use Parameter Validation: Define schema for query, body, and response parameters.
  3. Keep Route Handlers Simple: Focus on request handling logic, move business logic to services.
  4. Leverage Dependency Injection: Use @Inject(() => Service) for clean service integration.
  5. Implement Proper Error Handling: Catch and handle expected errors appropriately.
  6. Apply Security Middleware: Use middleware for authentication, CSRF protection, etc.
  7. Clear Status Codes: Use appropriate HTTP status codes for different responses.
  8. Document Your API: Add clear descriptions for each endpoint and its parameters.
  9. Follow RESTful Principles: Use appropriate HTTP methods for different operations.
  10. Implement Rate Limiting: Protect against abuse with rate limiting middleware.