A Data Field Definition (Data Dictionary) describes each data field, including name, type, format, validation rules, and purpose, so teams handle data consistently.
Purpose and Benefits
- Improves data clarity: Everyone understands meaning and usage.
- Supports development: Clear structure and validation rules.
- Better testing: QA can validate formats and rules.
- Prevents inconsistency: Standard naming and formatting.
- Helps DB & API design: Guides schema and payload definitions.
Recommended (Detailed) Data Field Definition Template
| Field ID | Field Name | Description | Data Type | Format / Length | Required | Validation Rules | Example Value | Notes |
|---|---|---|---|---|---|---|---|---|
| DF-001 | Email Address | User's registered email address | String | 100 chars | Yes | Must be valid email format | user@email.com | Used for login |
| DF-002 | Password | User login password | String | 8–20 chars | Yes | Minimum 8 characters | ******** | Must be encrypted |
| DF-003 | Phone Number | User contact number | String | 10–15 digits | No | Must contain digits only | 9876543210 | Country code optional |
| DF-004 | Order Amount | Total order value | Decimal | 10,2 | Yes | Must be greater than zero | 1250.50 | Currency INR |
| DF-005 | Account Status | Indicates account state | Enum | Active / Inactive | Yes | Allowed values only | Active | Controlled by system |
Field Explanation
- Field ID: Unique identifier (e.g., DF-001).
- Field Name: Name of the data attribute (Email Address, Customer ID).
- Description: Purpose of the field.
- Data Type: String, Integer, Decimal, Boolean, Date, Enum.
- Format / Length: e.g., 100 chars, YYYY-MM-DD, Decimal (10,2).
- Required: Yes / No.
- Validation Rules: Email format, min length, digits only, allowed values.
- Example Value: Sample valid data.
- Notes: Constraints or implementation tips.