javascript if not is null code example

Example 1: javascript not null

if (variable !== null) {
  console.log("Var is NOT null");
}

Example 2: javascript is not null

if(data !== null && data !== '') {
   // do something
}

Example 3: javascript check if null

if (variable === null) { //Executes only if variable is null but not undefined
  //Code here
}

if (variable == null) { //Executes if variable is null OR undefined
  //Code here
}