I'm trying to make an id searcher which does a thing when you input the right id. However, the JavaScript if statement always runs. How?

If you will use equal operator(=) in if condition the if block will always be executed.

You need to use == operator or === .

Example

Following is the code −

var details = [
   {
      id: 10001,
      name: "John"
   },
   {
      id: 10002,
      name: "Bob"
   },
   {
      id: 10003,
      name: "Carol"
   },
   {
      id: 10004,
      name: "David"
   }
]
var searchId = 10003;
for (var index = 0; index < details.length; index++) {
   if (details[index].id === searchId) {
      console.log(details[index].id + " found");
      break;
   }
}

To run the above program, you need to use the below command −

node fileName.js.

Here, my file name is demo322.js.

Output

This will produce the following output −

PS C:\Users\Amit\javascript-code> node demo322.js
10003 found