Configuration

Complete configuration reference for YasuiJS applications using yasui.createServer() and yasui.createApp().

Overview

YasuiJS provides two main ways to create your application:

• yasui.createServer(config) - Creates and starts an HTTP server automatically
• yasui.createApp(config) - Returns an Express application for manual configuration

Both methods accept the same configuration object with the following options.

Configuration Options

Required Options

controllers

Type: Array<Constructor>
Description: Array of controller classes to register in your application.

import { UserController, ProductController } from './controllers';

yasui.createServer({
  controllers: [UserController, ProductController]
});

Optional Options

middlewares

Type: Array<Constructor | RequestHandler>
Default: []
Description: Array of global middlewares to apply to all requests. Can be YasuiJS middleware classes or Express RequestHandler functions.

import { LoggingMiddleware } from './middleware';
import cors from 'cors';

yasui.createServer({
  controllers: [UserController],
  middlewares: [LoggingMiddleware, cors()]
});

environment

Type: string
Default: process.env.NODE_ENV || 'development'
Description: Environment name for your application.

yasui.createServer({
  controllers: [UserController],
  environment: 'production'
});

port

Type: number
Default: 3000
Description: Port number for the HTTP server. Only used with createServer().

yasui.createServer({
  controllers: [UserController],
  port: 8080
});

debug

Type: boolean
Default: false
Description: Enable debug mode with additional logging and request tracing.

yasui.createServer({
  controllers: [UserController],
  debug: true
});

injections

Type: Array<{ token: string, provide: any }>
Default: []
Description: Custom injection tokens for dependency injection. See Dependency Injection for details.

yasui.createServer({
  controllers: [UserController],
  injections: [
    { token: 'DATABASE_URL', provide: 'postgresql://localhost:5432/mydb' },
    { token: 'CONFIG', provide: { apiKey: 'secret' } }
  ]
});

swagger

Type: SwaggerConfig | undefined
Default: undefined
Description: Swagger documentation configuration. See Swagger for details.

yasui.createServer({
  controllers: [UserController],
  swagger: {
    enabled: true,
    path: '/api-docs',
    info: {
      title: 'My API',
      version: '1.0.0',
      description: 'API documentation'
    }
  }
});

enableDecoratorValidation

Type: boolean
Default: true
Description: Enable validation of decorators at startup to catch configuration errors.

yasui.createServer({
  controllers: [UserController],
  enableDecoratorValidation: false
});

createServer() vs createApp()

createServer()

Creates an HTTP server and starts listening automatically:

import yasui from 'yasui';

yasui.createServer({
  controllers: [UserController],
  port: 3000,
  debug: true
});

// Server is automatically started and listening on port 3000

Use when:

• You want to start your server immediately
• You don't need additional Express configuration
• You're building a simple API

createApp()

Returns an Express application for manual configuration:

import yasui from 'yasui';

const app = yasui.createApp({
  controllers: [UserController]
});

// Add custom Express middleware
app.use('/health', (req, res) => {
  res.json({ status: 'ok' });
});

// Add custom routes
app.get('/custom', (req, res) => {
  res.json({ message: 'Custom route' });
});

// Start the server manually
app.listen(3000, () => {
  console.log('Server running on port 3000');
});

Use when:

• You need custom Express configuration
• You want to add custom routes or middleware
• You need more control over server startup
• You're integrating with existing Express applications

Configuration Examples

Basic API Setup

import yasui from 'yasui';
import { UserController, AuthController } from './controllers';

yasui.createServer({
  controllers: [UserController, AuthController],
  port: 3000,
  debug: true
});

Complete Configuration

import yasui from 'yasui';
import { UserController, AuthController } from './controllers';
import { AuthMiddleware, LoggingMiddleware } from './middleware';

yasui.createServer({
  controllers: [UserController, AuthController],
  middlewares: [LoggingMiddleware, AuthMiddleware],
  port: 3000,
  debug: false,
  environment: 'production',
  enableDecoratorValidation: true,
  injections: [
    { token: 'DATABASE_URL', provide: process.env.DATABASE_URL },
    { token: 'JWT_SECRET', provide: process.env.JWT_SECRET }
  ],
  swagger: {
    enabled: true,
    path: '/api-docs',
    info: {
      title: 'My API',
      version: '1.0.0',
      description: 'Complete API with all features'
    }
  }
});

Express Integration

import yasui from 'yasui';
import express from 'express';
import cors from 'cors';
import helmet from 'helmet';

const app = yasui.createApp({
  controllers: [UserController],
  middlewares: [LoggingMiddleware]
});

// Add Express middleware
app.use(cors());
app.use(helmet());
app.use(express.json({ limit: '10mb' }));

// Add custom routes
app.get('/health', (req, res) => {
  res.json({ status: 'ok', timestamp: new Date().toISOString() });
});

// Error handling middleware
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({ error: 'Something went wrong!' });
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

Debug Mode

Enable debug mode to see detailed information:

yasui.createServer({
  controllers: [UserController],
  debug: true
});

Debug mode provides:

• Request/response logging
• Dependency injection details
• Route registration information
• Error stack traces