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 https://stackoverflow.com/questions/72127339/getting-this-error-on-running-js-using-node-uncaught-syntaxerror-unexpected-i — Michael Freidgeim, Mar 20 '23 at 12:19

David Tang · Accepted Answer · 2011-02-15T05:23:40.477

98

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 '11 at 05:23

answered Feb 15 '11 at 05:17

David Tang

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It is also a good idea to use some kind of hinter or an IDE that has syntax validation. – totymedli Jun 21 '16 at 10:14
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 – Mr Megamind Jan 24 '17 at 12:04

score 7 · Answer 2 · answered Feb 15 '11 at 05:18

7

Replace

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

with

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

answered Feb 15 '11 at 05:18

Robin

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score 1 · Answer 3 · answered Jan 14 '19 at 13:56

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 '19 at 13:56

M. Habib

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ashish.chotalia · Answer 4 · 2011-02-15T05:53:15.877

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 '11 at 05:53

answered Feb 15 '11 at 05:19

ashish.chotalia

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9

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). – Kobi Feb 15 '11 at 05:26
1

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. – ashish.chotalia Feb 15 '11 at 05:27
You can still edit your answer, of course. (Code's already bolded on SO.) – Feb 15 '11 at 05:47

score 0 · Answer 5 · answered Jun 04 '20 at 21:14

0

copy this line and replace in your project

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

there is a simple problem with coma (,)

answered Jun 04 '20 at 21:14

MD SHAYON

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score 0 · Answer 6 · answered Feb 19 '22 at 15:44

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 '22 at 15:44

ahmad pirzargar

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SyntaxError: Unexpected Identifier in Chrome's Javascript console

Code:

Output:

6 Answers6

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