🚀 MockServer

A powerful CLI tool to spin up mock servers instantly with built-in chaos engineering capabilities. Perfect for frontend development when backend APIs aren't ready yet.

✨ Features

• 🎯 Quick Setup - Initialize and start mock servers in seconds
• 📱 Ready-Made Templates - Social media, e-commerce, and basic templates
• 🔥 Chaos Engineering - Test error handling with configurable failure rates
• 📊 Pagination Support - Automatic pagination for large datasets
• 🎨 Pretty Logging - Beautiful, colorful CLI output
• ⚡ Hot Reload - Watch mode for schema changes
• 🌐 Full REST Support - GET, POST, PUT, PATCH, DELETE methods
• 📝 Rich Data Types - 20+ field types powered by Faker.js

📦 Installation

npm install -g cli-mockserver

Or use locally in your project:

npm install --save-dev cli-mockserver

🚀 Quick Start

1. Initialize a new schema

mockserver init

Choose from templates:

• 📱 Social Media (posts, comments, users, likes, etc.)
• 🛒 E-commerce (products, orders, cart)
• 📝 Basic (simple REST endpoints)

2. Start the server

mockserver start

Your mock API is now running at http://localhost:9500!

3. Test your endpoints

curl http://localhost:9500/api/users
curl http://localhost:9500/api/posts
curl http://localhost:9500/api/posts/123/comments

📖 Commands

start - Start the mock server

mockserver start [options]

Options:
  -p, --port <port>        Override port from schema
  -h, --host <host>        Host address (default: localhost)
  --no-chaos               Disable chaos engineering
  -w, --watch              Watch schema file for changes

init - Initialize a new schema

mockserver init [options]

Options:
  -t, --template <name>    Use template (social, ecommerce, basic)
  -f, --force              Overwrite existing schema

validate - Validate schema.json

mockserver validate [options]

Options:
  -s, --schema <path>      Path to schema file

info - Show schema information

mockserver info

generate - Generate static JSON files

mockserver generate [options]

Options:
  -o, --output <dir>       Output directory (default: ./mock-data)

🎨 Field Types

MockChaos supports 20+ field types:

Basic Types

• uuid - Unique identifier
• email - Email address
• username - Username
• firstName - First name
• lastName - Last name
• sentence - Random sentence
• paragraph - Random paragraph
• word - Random word
• avatar - Avatar image URL
• image - Random image URL
• url - Random URL
• city - City name
• timezone - Timezone string
• boolean - true/false

Date Types

• date:past - Past date
• date:recent - Recent date (last few days)
• date:future - Future date
• date:recent:nullable - Recent date or null

Advanced Types

• integer:min:max - Integer in range (e.g., integer:0:100)
• enum:a,b,c - Random from list (e.g., enum:admin,user,guest)
• array:type:min:max - Array of items (e.g., array:image:0:5)
• image:type - Typed image (e.g., image:landscape, image:portrait)

Nested Objects

{
  "fields": {
    "user": {
      "id": "uuid",
      "name": "firstName",
      "email": "email"
    }
  }
}

🔥 Chaos Engineering

Enable chaos mode to test error handling:

{
  "chaos": {
    "enabled": true,
    "globalErrorRate": 0.05,
    "scenarios": {
      "timeout": 0.02,
      "serverError": 0.03,
      "networkError": 0.02
    }
  }
}

Set resource-specific error rates:

{
  "resources": [
    {
      "endpoint": "/api/users",
      "errorConfig": {
        "rate": 0.8,
        "code": 503,
        "message": "Database Connection Failed"
      }
    }
  ]
}

📊 Pagination

Enable pagination for large datasets:

{
  "resources": [
    {
      "endpoint": "/api/posts",
      "count": 100,
      "pagination": {
        "enabled": true,
        "pageSize": 15
      }
    }
  ]
}

Query with pagination:

curl http://localhost:9500/api/posts?page=2&limit=10

Response includes pagination metadata:

{
  "data": [...],
  "pagination": {
    "page": 2,
    "limit": 10,
    "total": 100,
    "totalPages": 10,
    "hasNext": true,
    "hasPrev": true
  }
}

🎯 Example Schema

Here's a complete social media schema:

{
  "port": 9500,
  "host": "localhost",
  "chaos": {
    "enabled": true,
    "globalErrorRate": 0.05
  },
  "resources": [
    {
      "id": "users",
      "name": "Users",
      "endpoint": "/api/users",
      "method": "GET",
      "count": 50,
      "pagination": {
        "enabled": true,
        "pageSize": 20
      },
      "fields": {
        "id": "uuid",
        "username": "username",
        "email": "email",
        "avatar": "avatar",
        "verified": "boolean",
        "followersCount": "integer:0:10000",
        "bio": "sentence",
        "createdAt": "date:past"
      }
    }
  ]
}

🛠️ Development

# Clone the repository
git clone https://github.com/himasnhu-at/mockserver.git
cd mockserver

# Install dependencies
npm install

# Build
npm run build

# Development mode
npm run dev start

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

BSD-3-Clause License - feel free to use this in your projects!

🙏 Acknowledgments

• Powered by Faker.js for realistic data generation
• Built with Express and Commander
• Beautiful CLI with Chalk and Ora

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Made with ❤️ for frontend developers who are tired of waiting for backend APIs