Add Node.js implementation with Express REST API

NODEJS_VERSION.md

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+# Node.js Version - Quick Start Guide
+
+## What is This?
+
+This is the **Node.js version** of the Tool Calling API project. It provides the same functionality as the Python version but uses Node.js, Express, and modern JavaScript practices.
+
+## Location
+
+The Node.js version is located in the `nodejs_version/` directory.
+
+## Quick Start
+
+```bash
+# Navigate to the Node.js version
+cd nodejs_version
+
+# Install dependencies
+npm install
+
+# Configure environment
+cp .env.example .env
+# Edit .env with your Africa's Talking credentials
+
+# Start the server
+npm start
+```
+
+The API will be available at http://localhost:3000
+
+## Key Differences from Python Version
+
+| Feature | Python | Node.js |
+|---------|--------|---------|
+| Interface | Gradio Web UI | REST API |
+| Port | 7860 | 3000 |
+| Usage | Web browser | HTTP requests |
+| Framework | Gradio + Flask | Express |
+| Validation | Pydantic | Zod |
+
+## API Usage
+
+### Python (Gradio)
+1. Open http://localhost:7860
+2. Type message in chat
+3. Get response in UI
+
+### Node.js (REST API)
+```bash
+curl -X POST http://localhost:3000/api/chat \
+  -H "Content-Type: application/json" \
+  -d '{"message": "Send airtime to +254712345678 with 10 KES"}'
+```
+
+## Documentation
+
+For complete documentation, see:
+- `nodejs_version/README.md` - Full documentation
+- `nodejs_version/IMPLEMENTATION_SUMMARY.md` - Implementation details
+- `nodejs_version/PYTHON_VS_NODEJS.md` - Comparison guide
+
+## Features
+
+- ✅ Send airtime
+- ✅ Send SMS
+- ✅ Search news
+- ✅ Translate text
+- ✅ Send USSD
+- ✅ Send mobile data
+- ✅ Get balance
+
+## Requirements
+
+- Node.js 18+
+- Ollama running locally
+- Africa's Talking credentials
+
+## Testing
+
+```bash
+cd nodejs_version
+npm test
+```
+
+## Questions?
+
+Check the comprehensive documentation in `nodejs_version/README.md`

nodejs_version/.env.example

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+# Africa's Talking API Credentials
+AT_USERNAME=sandbox
+AT_API_KEY=your_api_key_here
+
+# Test Configuration
+TEST_PHONE_NUMBER=+254712345678
+
+# Server Configuration
+PORT=3000
+
+# Logging Configuration
+LOG_LEVEL=info
+
+# Ollama Configuration (optional - defaults to localhost:11434)
+# OLLAMA_HOST=http://localhost:11434

nodejs_version/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+# Audio files
+*.mp3

nodejs_version/.prettierrc.js

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+export default {
+  semi: true,
+  trailingComma: 'es5',
+  singleQuote: true,
+  printWidth: 100,
+  tabWidth: 2,
+  useTabs: false,
+  arrowParens: 'always',
+  endOfLine: 'lf',
+};

nodejs_version/Dockerfile

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+# Node.js Tool Calling API Dockerfile
+
+FROM node:18-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Copy application files
+COPY . .
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:3000/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1); });"
+
+# Run the application
+CMD ["node", "app.js"]