How to display the default value?

[whitegem99]

<Form.Item className='form_item' name='ssn' rules={[ { required: true, message: 'Please input your US social security number', whitespace: true, }, { message: 'Only numbers must be entered', pattern: new RegExp(/^\d{3}-\d{2}-\d{4}$/), } ]} > <MaskedInput mask="000-00-0000" /> </Form.Item>

I got the value of this form item from api. But after replacing the with , the value are not showed.
Thank you.