JavaScript TypeError – Invalid assignment to const “X”

 

This JavaScript exception invalid assignment to const occurs if a user tries to change a constant value. Const declarations in JavaScript can not be re-assigned or re-declared.

Message:

TypeError: invalid assignment to const "x" (Firefox)
TypeError: Assignment to constant variable. (Chrome)
TypeError: Assignment to const (Edge)
TypeError: Redeclaration of const 'x' (IE)

Error Type:

TypeError

Cause of Error: A const value in JavaScript is changed by the program which can not be altered during normal execution.

<script>

    const GFG = "This is GFG";

    // Error here

    GFG = "This is GeeksForGeeks"; 

</script>

 

Output(in console):

TypeError: Assignment to const