How to read two different IR sensor data in Arduino and Send that data to web application through node.js

Question

so, when I run the node.js server it will getting the sensor data but in the web both are working but, when i cover one sensor both 'slots' display as not available.

Node js code

app.js, lastpart of the code

Index.html

Index.html

Arduino code

String notav = "Not Avaiable";


void setup() {
  Serial.begin(9600);
  pinMode(4,INPUT);
  pinMode(7,INPUT); 
  pinMode(11,OUTPUT);
  pinMode(12,OUTPUT);
}
int i = 1;
void loop() {

  if(digitalRead(4)== HIGH){
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    Serial.println(av);
  }else{
    digitalWrite(11,LOW);
    digitalWrite(12,HIGH);
    Serial.println(notav);
    delay(5000);
  }
   // second sensor
  if(digitalRead(7)== HIGH){
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    Serial.println(av);
  }else{
    digitalWrite(11,LOW);
    digitalWrite(12,HIGH);
    Serial.println(notav);
    delay(5000);
  }

}```