🚀 Lambda Run

Run AWS Lambda functions locally with smart preferences and flexible test data management

Transform your AWS Lambda development workflow with Lambda Run - the VS Code extension that makes local testing effortless, intelligent, and lightning-fast.

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✨ Features at a Glance

🎯 One-Click Execution

Execute Lambda functions directly from your YAML files with intuitive CodeLens buttons

🧠 Smart Memory

Remembers your preferences per function - test files, environments, and regions

🔄 Dual Framework Support

Works seamlessly with both SAM and Serverless Framework

📁 Flexible Test Management

Intelligent test file discovery with customizable search patterns

📊 Execution Tracking

Complete history of your function runs with detailed statistics

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🚀 Getting Started

Prerequisites

• VS Code 1.93.0 or higher
• AWS SAM CLI (for SAM projects) or Serverless Framework (for Serverless projects)
• Node.js for your Lambda functions

Installation

1. Open VS Code
2. Go to Extensions (Ctrl+Shift+X)
3. Search for "Lambda Run"
4. Click Install

First Run

1. Open a workspace with template.yaml (SAM) or serverless.yml (Serverless)
2. Look for the 🚀 Run Function buttons above your function definitions
3. Click to execute - the extension will guide you through the setup!

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🎨 Core Features

📋 CodeLens Integration

Smart buttons appear directly in your YAML files:

functions:
  getUserData:                    # 🚀 Run Function | ⚡ Run (Last Settings)
    handler: src/handlers/user.getUserData
    events:
      - http:
          path: /user/{id}
          method: get

• 🚀 Run Function - Execute with full configuration options
• ⚡ Run (Last Settings) - Instant re-run with previously used settings

🧠 Intelligent Preferences

Lambda Run learns and adapts to your workflow:

• Per-Function Memory: Remembers test files, environments, and regions for each function
• Smart Defaults: Pre-selects your most-used configurations
• Auto-Cleanup: Removes invalid preferences when files or configs change

🔍 Smart Test File Discovery

Multiple discovery strategies for maximum flexibility:

📁 my-lambda-project/
├── 📁 test-data/
│   ├── user-create.json     ← Prioritized for 'createUser' function
│   ├── user-update.json     ← Prioritized for 'updateUser' function
│   └── general-test.json
├── 📁 tests/fixtures/
│   └── integration-tests.json
└── 📁 custom-location/
    └── specific-test.json

Configuration Options:

• Specific Folders: Configure exact locations for test files
• Pattern Matching: Use glob patterns (**/*.json, **/test-*.json)
• Function Priority: Automatically prioritize test files containing function names
• Workspace Search: Fall back to searching entire workspace

🌍 Environment & Region Management

Flexible configuration management:

Environments:

Development → PreProd → Prod

AWS Regions:

ap-south-1 (Primary)
us-east-1 (Backup)
eu-west-1 (Global)

• Add/remove environments and regions through UI
• Validation prevents empty configurations
• Auto-cleanup of invalid defaults

📊 Execution History & Analytics

Complete visibility into your development workflow:

📈 Execution Statistics:
├── Total Runs: 47
├── Success Rate: 94%
├── Average Duration: 2.3s
└── Most Used: getUserData (12 runs)

📋 Recent History:
├── ✅ getUserData (PreProd, ap-south-1) - 2.1s
├── ✅ createUser (Prod, us-east-1) - 1.8s
├── ❌ updateUser (PreProd, ap-south-1) - Failed
└── ✅ deleteUser (PreProd, ap-south-1) - 2.5s

Features:

• Detailed Logging: Track every execution with timestamps and duration
• Re-run from History: Click any history item to execute again
• Success Tracking: Monitor which functions are working reliably
• Export Capabilities: Copy statistics for reporting

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🎛️ Configuration

Command Palette Actions

Access all features via Ctrl+Shift+P:

• Lambda Run: Configure Environments - Manage deployment stages
• Lambda Run: Configure Regions - Manage AWS regions
• Lambda Run: Configure Test Data Locations - Set up test file directories
• Lambda Run: Show Execution History - View and re-run previous executions
• Lambda Run: Manage Extension Data - Statistics and data management
• Lambda Run: Reset Extension to Defaults - Clean slate reset

⌨️ Keyboard Shortcuts

Shortcut	Action
Ctrl+Shift+R	Run function with last settings
Ctrl+Shift+H	Show execution history

Mac users: Replace Ctrl with Cmd

⚙️ Settings

Fine-tune Lambda Run through VS Code Settings (Ctrl+,):

{
  "lambdaRun.environments": ["Dev", "Staging", "Prod"],
  "lambdaRun.regions": ["us-east-1", "eu-west-1"],
  "lambdaRun.testDataLocations": ["test-data", "tests/fixtures"],
  "lambdaRun.rememberPreferences": true,
  "lambdaRun.functionSpecificTestPriority": true,
  "lambdaRun.maxExecutionHistory": 50,
  "lambdaRun.notificationLevel": "info"
}

Key Settings:

• testDataLocations - Folders to search for test files
• testFilePatterns - File patterns to match (e.g., **/*.json)
• rememberPreferences - Save last-used settings per function
• reuseTerminals - Reuse terminals vs create new ones
• autoShowTerminal - Automatically show terminal during execution

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🔧 Advanced Usage

Custom Test File Patterns

Configure specific patterns for your test files:

{
  "lambdaRun.testFilePatterns": [
    "**/*-test.json",        // Standard test files
    "**/fixtures/*.json",    // Fixture files
    "**/samples/**.json"     // Sample data
  ]
}

Environment-Specific Variables

Lambda Run automatically detects and uses environment files:

📁 your-project/
├── env.json          ← Used for PreProd environment
├── envProd.json      ← Used for Prod environment
└── template.yaml

Terminal Management

Control how terminals are handled:

• Reuse Terminals: One terminal per function (efficient)
• New Terminals: Fresh terminal for each execution (isolated)
• Auto-Show: Automatically bring terminal to focus

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🏗️ Framework Support

SAM (Serverless Application Model)

File Structure:

# template.yaml
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Resources:
  GetUserFunction:              # 🚀 Run Function
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/user.getUser
      Runtime: nodejs18.x

Generated Command:

sam local invoke GetUserFunction \
  --template-file template.yaml \
  --event "test-data/user-get.json" \
  --parameter-overrides Stage=PreProd Mode=Update \
  --region ap-south-1 \
  --env-vars env.json

Serverless Framework

File Structure:

# serverless.yml
service: my-lambda-service

functions:
  getUser:                      # 🚀 Run Function
    handler: src/user.getUser
    events:
      - http:
          path: /user/{id}
          method: get

Generated Command:

serverless invoke local \
  --function getUser \
  --path "test-data/user-get.json" \
  --stage PreProd \
  --region ap-south-1 \
  --param 'mode=Update'

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📈 Workflow Examples

Daily Development Workflow

1. Morning Setup: Open your Lambda project
2. Quick Testing: Use ⚡ Run (Last Settings) for rapid iterations
3. New Features: Use 🚀 Run Function to test with different data
4. Environment Testing: Switch between PreProd/Prod environments
5. History Review: Check Ctrl+Shift+H for execution patterns

Team Collaboration

1. Shared Config: Commit .vscode/settings.json with team preferences
2. Test Organization: Standardize test file locations and patterns
3. Environment Sync: Ensure all team members have same environments configured

CI/CD Integration

While Lambda Run is for local development, it helps prepare for CI/CD:

1. Test Validation: Ensure all test files work locally before CI
2. Environment Parity: Test with same environments used in CI/CD
3. Command Generation: See exact commands that work locally

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🚨 Troubleshooting

Common Issues

🔸 "No test files found"

• Check lambdaRun.testDataLocations settings
• Verify test files exist in specified locations
• Try "Configure Test Data Locations" command

🔸 "Handler not defined"

• Ensure your YAML has proper handler field
• Check function syntax matches SAM or Serverless format

🔸 "Command failed"

• Verify SAM CLI or Serverless Framework is installed
• Check terminal output for detailed error messages
• Ensure AWS credentials are configured

Debug Mode

Enable verbose logging:

{
  "lambdaRun.notificationLevel": "verbose"
}

View detailed logs in:

• Output Panel: View → Output → "Lambda Run"
• Developer Tools: Help → Toggle Developer Tools → Console

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🎯 Best Practices

📁 Project Organization

📁 my-lambda-project/
├── 📁 src/
│   ├── handlers/
│   └── utils/
├── 📁 test-data/              ← Organized test files
│   ├── user/
│   │   ├── create-user.json
│   │   └── update-user.json
│   └── auth/
│       └── login.json
├── 📁 tests/                  ← Unit tests
├── env.json                   ← PreProd environment variables
├── envProd.json              ← Prod environment variables
├── template.yaml             ← SAM template
└── serverless.yml           ← Serverless config

⚡ Performance Tips

1. Enable Preference Memory: Set rememberPreferences: true
2. Reuse Terminals: Set reuseTerminals: true
3. Organize Test Files: Use function-specific naming
4. Limit History: Set reasonable maxExecutionHistory

🔒 Security

• Environment Files: Add env*.json to .gitignore
• Sensitive Data: Use AWS Parameter Store for secrets
• Local Only: Lambda Run is for local development - not production

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🤝 Contributing

We welcome contributions! Here's how to get started:

Development Setup

# Clone the repository
git clone https://github.com/madara-uchihaaa/lambda-run.git

# Install dependencies
npm install

# Start development
npm run watch

# Package extension
npm run package

Contribution Guidelines

• 🐛 Bug Reports: Use GitHub issues with detailed reproduction steps
• 💡 Feature Requests: Describe use case and expected behavior
• 🔧 Pull Requests: Include tests and update documentation
• 📝 Documentation: Help improve examples and guides

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📄 License

MIT License - see LICENSE file for details.

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🙏 Acknowledgments

• AWS SAM Team - For the excellent local development tools
• Serverless Framework - For revolutionizing serverless development
• VS Code Team - For the amazing extension API
• Community - For feedback and feature suggestions

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📞 Support

Need help? Here are your options:

• 📚 Documentation: Check this README and in-editor help
• 🐛 Issues: GitHub Issues
• 💬 Discussions: GitHub Discussions
• 📧 Contact: Create an issue for any questions

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Made with ❤️ for the serverless community

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