SyntaxError: missing variable name (Firefox) SyntaxError: Unexpected token = (Chrome)
What went wrong?
A variable is missing a name. This is likely due to a syntax error in your code. Probably a comma is wrong somewhere or you struggled with coming up with a name. Totally understandable! Naming things is so hard.
Missing a variable name
var = "foo";
It's tough coming up with good variable names. We all have been there.
var ohGodWhy = "foo";
Reserved keywords can't be variable names
There are a few variable names that are reserved keywords. You can't use these. Sorry :(
var debugger = "whoop"; // SyntaxError: missing variable name
Declaring multiple variables
Pay special attention to commas when declaring multiple variables. Is there an excess comma? Did you accidentally add commas instead of semicolons?
var x, y = "foo", var x, = "foo" var first = document.getElementById('one'), var second = document.getElementById('two'), // SyntaxError: missing variable name
The fixed version:
var x, y = "foo"; var x = "foo"; var first = document.getElementById('one'); var second = document.getElementById('two');
var arr = 1,2,3,4,5; // SyntaxError: missing variable name
This would be correct:
var arr = [1,2,3,4,5];