Expense Tracker
Log daily expenses to Notion via natural language chat. Type something like "chicken rice 5" and it auto-parses the item, amount, category, and payment method — then writes it to your Notion database.
Supports bilingual input (English + Chinese), 10 spending categories, and multiple payment platforms.
Setup
- Create a Notion integration at https://www.notion.so/my-integrations
- Share your expense database with the integration
- Set environment variables:
export NOTION_API_KEY="your_token_here"
export EXPENSE_DATABASE_ID="your_database_id_here"Required Notion Database Schema
| Property | Type | Notes |
|---|---|---|
| Name | title | Expense description |
| Amount | number | Numeric value in SGD, no currency prefix |
| Bank Name | select | OCBC, TRUST, DBS, Revolut, 支付宝, 微信, OCBC BUSINESS |
| Category | select | Food, Transport, shopping, business, Groceries, Leisure, Bills, medical, investment, Education |
| Transaction Date | date | ISO 8601 (YYYY-MM-DD) |
Usage Examples
| Input | Item | Amount | Category | Bank |
|---|---|---|---|---|
| chicken rice 5 | chicken rice | 5.00 | Food | OCBC |
| grab to school 12.50 | grab to school | 12.50 | Transport | OCBC |
| 咖啡 3.50 支付宝 | 咖啡 | 3.50 | Food | 支付宝 |
| notion labs 33 revolut | notion labs | 33.00 | business | Revolut |
| dinner with jy 57 trust | dinner with jy | 57.00 | Food | TRUST |
| driving class 90 | driving class | 90.00 | Education | OCBC |
Commands
/today— List today's expenses with running total/summary— Current month breakdown by category/month [month]— View a specific month (e.g.,/month march)/budget [amount]— Set monthly budget; shows remaining on each log/bank [name]— Filter expenses by payment method
Parsing Rules
- Amount is usually the last number: "2 coffee 9" → item="2 coffee", amount=9
- Strips "$" or "SGD" prefixes
- Supports decimals: "3.50", "12.5"
- Bank detection is case-insensitive: "ocbc" = "OCBC"
- Chinese platforms: "支付宝" / "alipay" → 支付宝, "微信" / "wechat" → 微信
- Default bank: OCBC (when none specified)
- If user specifies category explicitly (e.g., "chicken rice 5 business"), uses that override
- All amounts in SGD, rounded to 2 decimal places
Troubleshooting
If logging to Notion fails:
- Verify your
NOTION_API_KEYenvironment variable is set and valid - Confirm your
EXPENSE_DATABASE_IDis correct and the database is shared with your integration - Ensure database properties match the schema above (exact names, case-sensitive)
- Check that the integration has write permissions