Ensure data quality with Flow Forms' comprehensive validation system. Set rules, provide helpful error messages, and guide users to submit accurate information.
Built-in Validation
Field Type Validation
Each field type includes automatic validation:
- Email - Validates email format
- Date - Ensures valid dates
- File Upload - Checks file types and sizes
- Numeric Fields - Validates number formats
Required Fields
Mark any field as required:
- Toggle the "Required" switch in field settings
- Users cannot submit until all required fields are complete
- Clear indicators show which fields are mandatory
Input Rules & Masking
Input Masking
Format data automatically as users type:
- Phone numbers:
(xxx) xxx-xxxx - Social Security:
xxx-xx-xxxx - Postal codes:
xxxxx-xxxx - Custom patterns for your specific needs
See Input Masks for the full token reference and more examples.
Validation Rules
Validation rules ensure data meets your requirements before submission. Common rules include:
- Minimum/maximum length
- Specific formats or patterns
- Numeric ranges
- Date ranges
See Input Rules for the complete rule reference and recipes.
Custom Validation
Pattern Matching
Use regular expressions for complex validation:
- Custom ID formats
- Specific text patterns
- Advanced email validation
Cross-Field Validation
Validate fields in relation to each other:
- End date must be after start date
- Confirmation fields must match
- Sum of fields must equal total
Error Messages
Default Messages
Flow Forms provides clear, user-friendly error messages for all standard validations.
Custom Messages
Customize error messages to:
- Provide specific instructions
- Match your organization's tone
- Guide users to correct input
Best Practices
- Validate on the server side for security
- Provide immediate feedback when possible
- Use clear, helpful error messages
- Don't over-validate - only require what's necessary
- Test validation with edge cases