Tag-based filtering: Update prices only for products with specific tags
Percentage-based adjustments: Increase or decrease prices by a configurable percentage
Batch processing: Handles large inventories with automatic pagination
Error resilience: Continues processing even if individual products fail
Rate limit handling: Automatic retry logic for API rate limits
Progress tracking: Detailed logging to both console and Progress.md file
Environment-based configuration: Secure credential management via .env file

Prerequisites

Node.js (version 14 or higher)
A Shopify store with Admin API access
Shopify Private App or Custom App with the following permissions:
- read_products
- write_products

Installation

Clone or download this repository
Install dependencies:
```
npm install
```
Copy the environment template:
```
copy .env.example .env
```
Configure your environment variables (see Configuration section)

Configuration

Edit the .env file with your Shopify store details:

# Your Shopify store domain (without https://)
SHOPIFY_SHOP_DOMAIN=your-store.myshopify.com

# Your Shopify Admin API access token
SHOPIFY_ACCESS_TOKEN=shpat_your_access_token_here

# The product tag to filter by
TARGET_TAG=sale

# Price adjustment percentage (positive for increase, negative for decrease)
# Examples: 10 (increase by 10%), -15 (decrease by 15%), 5.5 (increase by 5.5%)
# Note: Only used in "update" mode, ignored in "rollback" mode
PRICE_ADJUSTMENT_PERCENTAGE=10

# Operation mode - determines whether to update prices or rollback to compare-at prices
# Options: "update" (default) or "rollback"
# When not specified, defaults to "update" for backward compatibility
OPERATION_MODE=update

Operation Mode Configuration

The OPERATION_MODE environment variable controls the application behavior:

update (default): Performs price adjustments using PRICE_ADJUSTMENT_PERCENTAGE
rollback: Sets prices to compare-at price values and removes compare-at prices

When OPERATION_MODE is not specified, the application defaults to update mode for backward compatibility.

Getting Your Shopify Credentials

For Private Apps (Recommended):

Go to your Shopify Admin → Apps → App and sales channel settings
Click "Develop apps" → "Create an app"
Configure Admin API access with read_products and write_products permissions
Install the app and copy the Admin API access token

For Custom Apps:

Go to your Shopify Admin → Settings → Apps and sales channels
Click "Develop apps" → "Create an app"
Configure the required API permissions
Generate and copy the access token

Usage

Basic Usage

Run the script with your configured environment:

npm start

node src/index.js

Operation Modes

The application supports two operation modes:

Update Mode (Default)

Adjusts product prices by a percentage:

npm run update

This performs the standard price adjustment functionality using the PRICE_ADJUSTMENT_PERCENTAGE setting.

Rollback Mode

Reverts prices by setting the main price to the compare-at price and removing the compare-at price:

npm run rollback

This is useful for reverting promotional pricing back to original prices. Products without compare-at prices will be skipped.

Operation Mode Indicators:

The console output clearly displays which operation mode is active
Progress.md logs distinguish between "Price Update Operation" and "Price Rollback Operation"
Configuration summary shows the operation mode being used

Debug Mode

Before running the main script, you can use the debug mode to see what tags exist in your store and verify your target tag:

npm run debug-tags

This will:

Show all products and their tags in your store
Check if your target tag exists
Suggest similar tags if exact match isn't found
Help troubleshoot tag-related issues

Example Scenarios

Increase prices by 10% for sale items:

TARGET_TAG=sale
PRICE_ADJUSTMENT_PERCENTAGE=10

Decrease prices by 15% for clearance items:

TARGET_TAG=clearance
PRICE_ADJUSTMENT_PERCENTAGE=-15

Apply a 5.5% increase to seasonal products:

TARGET_TAG=seasonal
PRICE_ADJUSTMENT_PERCENTAGE=5.5

Output and Logging

The script provides detailed feedback in two ways:

Console Output

Configuration summary at startup
Real-time progress updates
Product-by-product price changes
Final summary with success/failure counts

Progress.md File

Persistent log of all operations
Timestamps for each run
Detailed error information for debugging
Historical record of price changes

Example console output:

🚀 Starting Shopify Price Updater
📋 Configuration:
   Store: your-store.myshopify.com
   Tag: sale
   Adjustment: +10%

🔍 Found 25 products with tag 'sale'
✅ Updated Product A: $19.99 → $21.99
✅ Updated Product B: $29.99 → $32.99
⚠️  Skipped Product C: Invalid price data
...
📊 Summary: 23 products updated, 2 skipped, 0 errors

Error Handling

The script is designed to be resilient:

Rate Limits: Automatically retries with exponential backoff
Network Issues: Retries failed requests up to 3 times
Invalid Data: Skips problematic products and continues
API Errors: Logs errors and continues with remaining products
Missing Environment Variables: Validates configuration before starting

Testing

Before Running on Production

Test with a development store or backup your data
Start with a small subset by using a specific tag with few products
Verify the percentage calculation with known product prices
Check the Progress.md file to ensure logging works correctly

Recommended Testing Process

Create a test tag (e.g., "price-test") on a few products
Set TARGET_TAG=price-test in your .env
Run the script with a small percentage (e.g., 1%)
Verify the changes in your Shopify admin
Once satisfied, update your configuration for the actual run

Troubleshooting

Common Issues

"Authentication failed"

Verify your SHOPIFY_ACCESS_TOKEN is correct
Ensure your app has read_products and write_products permissions

"No products found"

Run npm run debug-tags to see all available tags in your store
Check that products actually have the specified tag
Tag matching is case-sensitive
Verify the tag format (some tags may have spaces, hyphens, or different capitalization)

"Rate limit exceeded"

The script handles this automatically, but you can reduce load by processing smaller batches

"Invalid percentage"

Ensure PRICE_ADJUSTMENT_PERCENTAGE is a valid number
Use negative values for price decreases

Debugging Steps

Run the debug script first: npm run debug-tags to see what tags exist in your store
Check the Progress.md file for detailed error information
Verify your .env configuration matches the required format
Test with a small subset of products first
Ensure your Shopify app has the necessary permissions

Debug Scripts

The project includes debugging tools:

npm run debug-tags - Analyze all product tags in your store
debug-tags.js - Standalone script to check tag availability and troubleshoot tag-related issues

Security Notes

Never commit your .env file to version control
Use environment-specific access tokens
Regularly rotate your API credentials
Test changes in a development environment first

File Structure

shopify-price-updater/
├── src/
│   ├── config/
│   │   └── environment.js     # Environment configuration
│   ├── services/
│   │   ├── shopify.js         # Shopify API client
│   │   ├── product.js         # Product operations
│   │   └── progress.js        # Progress logging
│   ├── utils/
│   │   ├── price.js           # Price calculations
│   │   └── logger.js          # Logging utilities
│   └── index.js               # Main entry point
├── tests/                    # Unit tests for the application
├── debug-tags.js            # Debug script to analyze store tags
├── .env                     # Your configuration (create from .env.example)
├── .env.example            # Configuration template
├── package.json            # Dependencies and scripts
├── Progress.md             # Generated progress log
└── README.md               # This file

Technical Details

API Implementation

Uses Shopify's GraphQL Admin API (version 2024-01)
Implements productVariantsBulkUpdate mutation for price updates
Built-in HTTPS client using Node.js native modules (no external HTTP dependencies)
Automatic tag formatting (handles both "tag" and "tag:tagname" formats)

Rate Limiting

Implements exponential backoff for rate limit handling
Maximum 3 retry attempts with increasing delays (1s, 2s, 4s)
Respects Shopify's API rate limits automatically

Error Recovery

Continues processing even if individual products fail
Comprehensive error categorization and reporting
Non-retryable errors are identified and logged appropriately

Available Scripts

Immediate Execution Scripts

npm start - Run the price updater (defaults to update mode for backward compatibility)
npm run update - Run the price update script (explicitly set to update mode)
npm run rollback - Run the price rollback script (set prices to compare-at prices)
npm run debug-tags - Analyze all product tags in your store
npm test - Run the test suite (if implemented)

Scheduled Execution Scripts

npm run schedule-update - Run scheduled price update (requires SCHEDULED_EXECUTION_TIME environment variable)
npm run schedule-rollback - Run scheduled price rollback (requires SCHEDULED_EXECUTION_TIME environment variable)

Scheduling Examples

Schedule a sale to start at 10:30 AM on December 25th:

# Set environment variable and run
set SCHEDULED_EXECUTION_TIME=2024-12-25T10:30:00 && npm run schedule-update

Schedule a sale to end (rollback) at midnight on January 1st:

# Set environment variable and run
set SCHEDULED_EXECUTION_TIME=2025-01-01T00:00:00 && npm run schedule-rollback

Schedule with specific timezone (EST):

# Set environment variable with timezone and run
set SCHEDULED_EXECUTION_TIME=2024-12-25T10:30:00-05:00 && npm run schedule-update

Using .env file for scheduling:

# Add to your .env file
SCHEDULED_EXECUTION_TIME=2024-12-25T10:30:00
OPERATION_MODE=update
TARGET_TAG=sale
PRICE_ADJUSTMENT_PERCENTAGE=10

Then run: npm run schedule-update

Common scheduling scenarios:

Black Friday sale start: Schedule price decreases for Friday morning
Sale end: Schedule rollback to original prices after promotion period
Seasonal pricing: Schedule price adjustments for seasonal campaigns
Flash sales: Schedule short-term promotional pricing
Holiday promotions: Schedule price changes for specific holidays

Note: When using scheduled execution, the script will display a countdown and wait until the specified time before executing the price updates. You can cancel the scheduled operation by pressing Ctrl+C during the waiting period.

License

This project is provided as-is for educational and commercial use. Please test thoroughly before using in production environments.