SyntaxError: Unexpected Identifier in Chrome's Javascript console

Question

I tested this javascript in Chrome's Javascript console and it returned SyntaxError: Unexpected Identifier.

I got this code from a tutorial and was just testing Chrome's console so i expected it to work, unless I'm using the console wrong?

Code:

var visitorName = "Chuck";
var myOldString = "Hello username. I hope you enjoy your stay username.";
var myNewString = myOldString.replace ("username," visitorName);

document.write("Old String = " + myOldString);
document.write("<br/>New string = " + myNewString);

Output:

SyntaxError: Unexpected identifier

Same error for a different reason stackoverflow.com/questions/72127339/… — Michael Freidgeim
– Michael Freidgeim, Commented Mar 20, 2023 at 12:19

David Tang · Accepted Answer · 2011-02-15 05:23:40Z

100

The comma got eaten by the quotes!

This part:

("username," visitorName);

Should be this:

("username", visitorName);

Aside: For pasting code into the console, you can paste them in one line at a time to help you pinpoint where things went wrong ;-)

edited Feb 15, 2011 at 5:23

answered Feb 15, 2011 at 5:17

David Tang

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2 Comments

totymedli Over a year ago

It is also a good idea to use some kind of hinter or an IDE that has syntax validation.

Mr Megamind Over a year ago

In my case it was the change of API version, I changed from x.7 to x.8 and it worked. Hope this helps someone

Robin · Accepted Answer · 2011-02-15 05:18:39Z

7

Replace

 var myNewString = myOldString.replace ("username," visitorName);

with

 var myNewString = myOldString.replace("username", visitorName);

answered Feb 15, 2011 at 5:18

Robin

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Comments

M. Habib · Accepted Answer · 2019-01-14 13:56:17Z

1

I got this error Unexpected identifier because of a missing semi-colon ; at the end of a line. Anyone wandering here for other than above-mentioned solutions, This might also be the cause of this error.

answered Jan 14, 2019 at 13:56

M. Habib

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Comments

ashish.chotalia · Accepted Answer · 2011-02-15 05:53:15Z

0

Write it as below

<script language="javascript">
var visitorName = 'Chuck';
var myOldString = 'Hello username. I hope you enjoy your stay username.';

var myNewString = myOldString.replace('username', visitorName);

document.write('Old String = ' + myOldString);
document.write('<br/>New string = ' + myNewString);
</script>

http://jsfiddle.net/h6xc4/23/

edited Feb 15, 2011 at 5:53

answered Feb 15, 2011 at 5:19

ashish.chotalia

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3 Comments

Kobi Over a year ago

You really should point out the problem. The OP didn't notice the comma on his/her own code, and isn't likely to spot the change. From a quick look, it looks like you're suggesting to use single quoted string instead of double quoted, which can be confusing - they are the same in JavaScript, but not in all languages (PHP, for one).

ashish.chotalia Over a year ago

I tried to place myOldString.replace('username', visitorName); in bold but some how if you are placing your code in code section it didn't output it bold.

user241244 Over a year ago

You can still edit your answer, of course. (Code's already bolded on SO.)

MD SHAYON · Accepted Answer · 2020-06-04 21:14:38Z

0

copy this line and replace in your project

var myNewString = myOldString.replace ("username", visitorName);

there is a simple problem with coma (,)

answered Jun 4, 2020 at 21:14

MD SHAYON

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Comments

ahmad pirzargar · Accepted Answer · 2022-02-19 15:44:08Z

0

I got SyntaxError: Unexpected identifier error, for invalid order between async and static, static must come first.

//Invalid
async static methodName() {

}

//Valid
static async methodName() {

}

answered Feb 19, 2022 at 15:44

ahmad pirzargar

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