@prathammahajan/csv-bulk-processor/CHANGELOG.md

Powerful, memory-efficient bulk data processing for CSV, Excel, and JSON files with streaming, validation, transformation, and performance monitoring

# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [1.0.0] - 2025-01-27

### Added
- **Initial Release** - First stable release of CSV Bulk Processor
- **Core Processing Engine** - Main BulkProcessor class with comprehensive file processing capabilities
- **Multi-Format Support** - Support for CSV, Excel (.xlsx, .xls), and JSON file formats
- **Memory-Efficient Streaming** - Streaming processor for large files with configurable chunk sizes
- **Data Validation Engine** - Comprehensive validation with schema, format, and custom rules
- **Data Transformation Engine** - Advanced data transformation with mapping, cleaning, and conversion
- **Progress Tracking System** - Real-time progress monitoring with resumable processing capabilities
- **Error Handling & Recovery** - Robust error detection, recovery, and rollback mechanisms
- **Batch Processing** - Optimized batch operations for large datasets
- **Performance Monitoring** - Built-in performance analytics and optimization tracking
- **Processing Analytics** - Detailed analytics and insights into processing performance
- **Event System** - Comprehensive event emission for progress, completion, and errors
- **Configuration Management** - Flexible configuration system for all processing options
- **Comprehensive Testing** - Full test suite with unit, integration, and performance tests
- **Documentation & Examples** - Complete documentation with practical usage examples

### Technical Features
- **Streaming Architecture** - Memory-efficient processing using Node.js streams
- **Format Processors** - Specialized processors for CSV, Excel, and JSON formats
- **Validation Framework** - Joi-based validation with custom rule support
- **Transformation Pipeline** - Data cleaning, mapping, and type conversion
- **Progress Tracking** - Real-time progress updates with session management
- **Error Recovery** - Automatic error detection and recovery mechanisms
- **Performance Metrics** - Throughput, memory usage, and processing time tracking
- **Batch Optimization** - Configurable batch sizes for optimal performance
- **Memory Management** - Automatic memory monitoring and optimization
- **Concurrent Processing** - Support for concurrent file processing operations

### File Format Support
- **CSV Files** - Full CSV support with custom delimiters and encoding
- **Excel Files** - Complete Excel support (.xlsx, .xls) with multiple sheets
- **JSON Files** - JSON processing with streaming support for large files

### Validation Features
- **Schema Validation** - Joi-based schema validation with custom rules
- **Format Validation** - Data format and type validation
- **Business Rules** - Custom business logic validation
- **Error Reporting** - Detailed validation error reporting

### Transformation Features
- **Field Mapping** - Flexible field mapping and renaming
- **Data Cleaning** - String trimming, date normalization, empty value handling
- **Type Conversion** - Automatic type conversion (string to number, date, boolean)
- **Data Normalization** - Data standardization and normalization

### Performance Features
- **Memory Monitoring** - Real-time memory usage tracking
- **Throughput Analytics** - Records per second processing metrics
- **Performance Optimization** - Automatic performance tuning
- **Resource Management** - Efficient resource utilization

### Error Handling
- **Error Detection** - Comprehensive error detection and classification
- **Recovery Mechanisms** - Automatic error recovery and retry logic
- **Rollback Support** - Transaction rollback on critical errors
- **Error Reporting** - Detailed error reporting and logging

### Testing & Quality
- **Unit Tests** - Comprehensive unit test coverage for all components
- **Integration Tests** - End-to-end integration testing
- **Performance Tests** - Performance and load testing
- **Test Coverage** - 100% test coverage for critical components
- **CI/CD Ready** - GitHub Actions compatible test suite

### Documentation
- **README** - Comprehensive documentation with examples
- **API Reference** - Complete API documentation
- **Usage Examples** - Practical examples for common use cases
- **Configuration Guide** - Detailed configuration options
- **Best Practices** - Performance and usage best practices

### Dependencies
- **Production Dependencies**:
  - `csv-parser` - CSV file parsing
  - `xlsx` - Excel file processing
  - `fast-csv` - High-performance CSV processing
  - `stream-json` - JSON streaming support
  - `joi` - Data validation
  - `lodash` - Utility functions
  - `moment` - Date handling
  - `winston` - Logging
  - `node-cron` - Scheduled processing
  - `axios` - HTTP requests

- **Development Dependencies**:
  - `jest` - Testing framework
  - `supertest` - HTTP testing
  - `eslint` - Code linting
  - `prettier` - Code formatting
  - `typescript` - Type definitions

### Platform Support
- **Node.js** - Version 14.0.0 and above
- **Operating Systems** - Windows, macOS, Linux
- **Architectures** - x64, arm64, ia32

### Performance Benchmarks
- **Small Files** (< 1MB) - Direct processing for optimal performance
- **Large Files** (> 1MB) - Streaming processing with memory efficiency
- **Memory Usage** - Configurable memory limits with automatic optimization
- **Throughput** - Optimized for high-volume data processing
- **Error Recovery** - Fast error detection and recovery

### Use Cases
- **Data Migration** - Efficient processing of large datasets
- **ETL Pipelines** - Extract, Transform, Load operations
- **Data Import/Export** - Enterprise data processing
- **Analytics Platforms** - Large-scale data processing
- **API Development** - Bulk data processing endpoints
- **Microservices** - Data processing components
- **Real-time Processing** - Streaming data processing
- **Startup MVPs** - Production-ready data processing

---

## Version History Summary

| Version | Date | Key Changes |
|---------|------|-------------|
| 1.0.0 | 2025-01-27 | Initial stable release with full feature set |

## Migration Guide

### Getting Started

**Installation:**
```bash
npm install @prathammahajan/csv-bulk-processor
```

**Basic Usage:**
```javascript
const BulkProcessor = require('@prathammahajan/csv-bulk-processor');

const processor = new BulkProcessor();
const result = await processor.processFile('data.csv');
```

**Advanced Configuration:**
```javascript
const processor = new BulkProcessor({
  streaming: { enabled: true, chunkSize: 1000 },
  validation: { enabled: true },
  transformation: { enabled: true },
  progress: { enabled: true }
});
```

### Configuration Options

**Streaming Configuration:**
```javascript
streaming: {
  enabled: true,           // Enable streaming for large files
  chunkSize: 1000,        // Records per chunk
  memoryLimit: '100MB'    // Memory limit
}
```

**Validation Configuration:**
```javascript
validation: {
  enabled: true,          // Enable validation
  schema: { /* schema */ },
  format: true,           // Format validation
  business: true          // Business rules
}
```

**Transformation Configuration:**
```javascript
transformation: {
  enabled: true,          // Enable transformation
  mapping: { /* mapping */ },
  cleaning: true,         // Data cleaning
  conversion: true        // Type conversion
}
```

### Event Handling

**Progress Tracking:**
```javascript
processor.on('progress', (data) => {
  console.log(`Processed ${data.recordsProcessed} records`);
});
```

**Error Handling:**
```javascript
processor.on('error', (error) => {
  console.error('Processing error:', error);
});
```

**Completion Handling:**
```javascript
processor.on('complete', (data) => {
  console.log('Processing completed!');
});
```

---

## Support

- 📧 **Issues**: [GitHub Issues](https://github.com/prathammahajan13/csv-bulk-processor/issues)
- 📖 **Documentation**: [GitHub Wiki](https://github.com/prathammahajan13/csv-bulk-processor/wiki)
- 💬 **Discussions**: [GitHub Discussions](https://github.com/prathammahajan13/csv-bulk-processor/discussions)
- ☕ **Support Development**: [Buy Me a Coffee](https://buymeacoffee.com/mahajanprae)

---

**Made with ❤️ by [Pratham Mahajan](https://github.com/prathammahajan13)**