How to verify a text field with api value in react js.?

Iam trying to add a verification in my website i want to verify my phone number digits according to the phone number digit object coming from the api I hace tried multiple things but it didn't work i would be great if any one can help.

<div className="col-8 ml-0 pl-0">
                <TextInputComponent
                  label={
                    <IntlMessages id="profile.emailbox.field.mobilenumber" />
                  }
                  type="text"
                  placeholder="Mobilnummer"
                  value={this.state.number}
                  onChange={(e) => {
                    if (e.target.value != this.props.user.data.user.phone_number_digits ) {
                      <small className="text-danger my-0 py-0">{this.state.errorNumber}</small>
                    }else {
                      this.handleChange(e, "number");
                    }
                  }}
                />
              </div>