How to Fix the ‘SyntaxError: “x” is a reserved identifier ‘ Error in Our JavaScript App?

Sometimes, we may run into the ‘SyntaxError: "x" is a reserved identifier’ when we’re developing JavaScript apps.

In this article, we’ll look at how to fix the ‘SyntaxError: "x" is a reserved identifier’ when we’re developing JavaScript apps.

Fix the ‘SyntaxError: "x" is a reserved identifier’ When Developing JavaScript Apps

To fix the ‘SyntaxError: "x" is a reserved identifier’ when we’re developing JavaScript apps, we should make sure we aren’t trying to use reserved keywords for variable names.

In Edge, the error message for this error is SyntaxError: The use of a future reserved word for an identifier is invalid.

In Firefox, the error message for this error is SyntaxError: "x" is a reserved identifier.

And in Chrome, the error message for this error is SyntaxError: Unexpected reserved word.

enum is a reserved keyword in strict or sloppy mode.

The following keywords are reserved keywords in strict mode only:

• implements
• interface
• let
• package
• private
• protected
• public
• static

For instance, we shouldn’t write code like"

const enum = { RED: 0, GREEN: 1, BLUE: 2 };

Also, we shouldn’t write coee like:

"use strict";
const package = ["potatoes", "apples", "fries"];

Instead, we should rename them so their names aren’t in the reserved keywords list:

const colorEnum = { RED: 0, GREEN: 1, BLUE: 2 };
const list = ["potatoes", "rice", "fries"];

Conclusion

To fix the ‘SyntaxError: "x" is a reserved identifier’ when we’re developing JavaScript apps, we should make sure we aren’t trying to use reserved keywords for variable names.

In Edge, the error message for this error is SyntaxError: The use of a future reserved word for an identifier is invalid.

In Firefox, the error message for this error is SyntaxError: "x" is a reserved identifier.

And in Chrome, the error message for this error is SyntaxError: Unexpected reserved word.