Wordpress - Uncaught SyntaxError: Unexpected token <

I am enqueue scripts in a child theme with this...

  function child_theme_scripts() {
      wp_enqueue_script( 'script-name', get_template_directory_uri() . '/js/custom-child.js', array(), '1.0.0', true );
  }
  add_action( 'wp_enqueue_scripts', 'child_theme_scripts' );

But i am getting a Uncaught SyntaxError: Unexpected token < in the console and when i click on the link to the error it is showing me the first line of the HTML doc where i am doing the doctype.

Worth mentioning that it throws this error when i have nothing in my custom-child.js or if i test with just a simple alert.

Any idea why this might be happening?

Here is what i have the JS file...

 alert('Yeah');


here is the whole HTML

<!DOCTYPE html>
<!--[if IE 6]>
<html id="ie6" lang="en-US">
<![endif]-->
<!--[if IE 7]>
<html id="ie7" lang="en-US">
<![endif]-->
<!--[if IE 8]>
<html id="ie8" lang="en-US">
<![endif]-->
<!--[if !(IE 6) | !(IE 7) | !(IE 8)  ]><!-->
<html lang="en-US">
<!--<![endif]-->
<head>
	<meta charset="UTF-8" />
			
	
	<link rel="pingback" href="/xmlrpc.php" />

		<!--[if lt IE 9]>
	<script src="/wp-content/themes/microphoto/js/html5.js" type="text/javascript"></script>
	<![endif]-->

	<script type="text/javascript">
		document.documentElement.className = 'js';
	</script>

	<title>Home | MIcroPhoto</title>
<link rel='dns-prefetch' href='//'>
<link rel='dns-prefetch' href='//fonts.googleapis.com'>
<link rel='dns-prefetch' href='//s.w.org'>
<link rel="alternate" type="application/rss+xml" title="MIcroPhoto &raquo; Feed" href="/?feed=rss2" />
<link rel="alternate" type="application/rss+xml" title="MIcroPhoto &raquo; Comments Feed" href="/?feed=comments-rss2" />
		<script type="text/javascript">
			window._wpemojiSettings = {"baseUrl":"https:\/\/s.w.org\/images\/core\/emoji\/2\/72x72\/","ext":".png","svgUrl":"https:\/\/s.w.org\/images\/core\/emoji\/2\/svg\/","svgExt":".svg","source":{"concatemoji":"http:\/\/\/microphoto\/wp-includes\/js\/wp-emoji-release.min.js?ver=4.6"}};
			!function(a,b,c){function d(a){var c,d,e,f,g,h=b.createElement("canvas"),i=h.getContext&&h.getContext("2d"),j=String.fromCharCode;if(!i||!i.fillText)return!1;switch(i.textBaseline="top",i.font="600 32px Arial",a){case"flag":return i.fillText(j(55356,56806,55356,56826),0,0),!(h.toDataURL().length<3e3)&&(i.clearRect(0,0,h.width,h.height),i.fillText(j(55356,57331,65039,8205,55356,57096),0,0),c=h.toDataURL(),i.clearRect(0,0,h.width,h.height),i.fillText(j(55356,57331,55356,57096),0,0),d=h.toDataURL(),c!==d);case"diversity":return i.fillText(j(55356,57221),0,0),e=i.getImageData(16,16,1,1).data,f=e[0]+","+e[1]+","+e[2]+","+e[3],i.fillText(j(55356,57221,55356,57343),0,0),e=i.getImageData(16,16,1,1).data,g=e[0]+","+e[1]+","+e[2]+","+e[3],f!==g;case"simple":return i.fillText(j(55357,56835),0,0),0!==i.getImageData(16,16,1,1).data[0];case"unicode8":return i.fillText(j(55356,57135),0,0),0!==i.getImageData(16,16,1,1).data[0];case"unicode9":return i.fillText(j(55358,56631),0,0),0!==i.getImageData(16,16,1,1).data[0]}return!1}function e(a){var c=b.createElement("script");c.src=a,c.type="text/javascript",b.getElementsByTagName("head")[0].appendChild(c)}var f,g,h,i;for(i=Array("simple","flag","unicode8","diversity","unicode9"),c.supports={everything:!0,everythingExceptFlag:!0},h=0;h<i.length;h++)c.supports[i[h]]=d(i[h]),c.supports.everything=c.supports.everything&&c.supports[i[h]],"flag"!==i[h]&&(c.supports.everythingExceptFlag=c.supports.everythingExceptFlag&&c.supports[i[h]]);c.supports.everythingExceptFlag=c.supports.everythingExceptFlag&&!c.supports.flag,c.DOMReady=!1,c.readyCallback=function(){c.DOMReady=!0},c.supports.everything||(g=function(){c.readyCallback()},b.addEventListener?(b.addEventListener("DOMContentLoaded",g,!1),a.addEventListener("load",g,!1)):(a.attachEvent("onload",g),b.attachEvent("onreadystatechange",function(){"complete"===b.readyState&&c.readyCallback()})),f=c.source||{},f.concatemoji?e(f.concatemoji):f.wpemoji&&f.twemoji&&(e(f.twemoji),e(f.wpemoji)))}(window,document,window._wpemojiSettings);
		</script>
		<meta content="Microphoto v.1.0.0" name="generator"/><style type="text/css">
img.wp-smiley,
img.emoji {
	display: inline !important;
	border: none !important;
	box-shadow: none !important;
	height: 1em !important;
	width: 1em !important;
	margin: 0 .07em !important;
	vertical-align: -0.1em !important;
	background: none !important;
	padding: 0 !important;
}
</style>
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<link rel="alternate" type="text/xml+oembed" href="/?rest_route=%2Foembed%2F1.0%2Fembed&#038;url=http%3A%2F%2F%2Fmicrophoto%2F%3Fpage_id%3D1020&#038;format=xml" />
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							#main-header .nav li ul a { color: #000000; }
						
		
					#top-menu li.current-menu-ancestor > a, #top-menu li.current-menu-item > a,
			.et_color_scheme_red #top-menu li.current-menu-ancestor > a, .et_color_scheme_red #top-menu li.current-menu-item > a,
			.et_color_scheme_pink #top-menu li.current-menu-ancestor > a, .et_color_scheme_pink #top-menu li.current-menu-item > a,
			.et_color_scheme_orange #top-menu li.current-menu-ancestor > a, .et_color_scheme_orange #top-menu li.current-menu-item > a,
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										.et-fixed-header #top-menu li.current-menu-ancestor > a,
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			.et_pb_row { padding: 27px 0; }
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			.et_pb_fullwidth_section { padding: 0; }
		}
		@media only screen and ( max-width: 980px ) {
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	</style>

	
	
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<body class="page page-id-1020 page-template-default logged-in admin-bar no-customize-support et_pb_button_helper_class et_fixed_nav et_show_nav et_cover_background et_pb_gutter osx et_pb_gutters3 et_primary_nav_dropdown_animation_fade et_secondary_nav_dropdown_animation_fade et_pb_footer_columns4 et_header_style_left et_pb_pagebuilder_layout et_right_sidebar chrome">
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	<script type="text/javascript">
		(function() {
			var request, b = document.body, c = 'className', cs = 'customize-support', rcs = new RegExp('(^|\\s+)(no-)?'+cs+'(\\s+|$)');

			request = true;

			b[c] = b[c].replace( rcs, ' ' );
			b[c] += ( window.postMessage && request ? ' ' : ' no-' ) + cs;
		}());
	</script>

</body>
</html>

Thanks!

Answers

Uncaught SyntaxError: Unexpected token < essentially means a 404 since the path you have defined in your second argument is invalid.

Wordpress documentation notes that get_template_directory_uri() returns the theme root without a trailing slash.

Let's say I have a theme called Green Fields and I want to load main.js with wp_enqueue_script. The tree for my theme looks something like this:

greenfields
  |_comments.php
  |_footer.php
  |_functions.php
  |_inc
  |  |_customizer.php
  |_page.php
  |_single.php
  |_src
  |  |_css
  |  |  |_custom.scss
  |  |_js
  |  |  |_main.js
  |_style.css

And let's say I'm not paying attention so I register and enqueue my script like this:

	<?php

	function loadJs() {
		wp_register_script(
			'main',
			get_template_directory_uri() . '/js/main.js',
			array('jquery'),
			null,
			false
		);
		wp_enqueue_script('main');
	}

	add_action("wp_enqueue_scripts", "loadJs");

	?>

When I refresh my page, I'm going to get the error we are talking about.

However, if I open the Network tab in Chrome's inspector, highlight main.js and click on Headers, I see this:

enter image description here

Although I get a 200 status code for the GET request made at http://localhost:8080/wp-content/themes/greenfields/js/main.js, this path is incorrect.

The correct path is http://localhost:8080/wp-content/themes/greenfields/src/js/main.js (for the record, I do not know why I get a 200 when the path is clearly invalid).

Once I revise the 2nd argument with get_template_directory_uri() . '/src/js/main.js', there is no error and my js file loads as expected.

I think the comment by Rory McCrossan above is probably correct. The < is HTML coming from a 404 page and since the code is expecting to execute JavaScript, this throws an error.

Although your particular issue is dealing with a child theme and your syntax is slightly different from the example I have given, the issue is the same– your path is incorrect.

Since I am posting this nearly 2 years after you asked the question, you've probably already figured this out but hopefully others will find this answer useful.

Posted on by Anonymous

For child themes, use get_stylesheet_directory_uri()

Whan a child theme calls get_template_directory_uri() it returns the directory of the parent theme. Since that's not where your targeted .js file is located, it causes the "Unexpected Token" error to occur.

Instead, to get the child theme's directory use get_stylesheet_directory_uri()

So, your code should be:

function child_theme_scripts() {
      wp_enqueue_script( 'script-name', get_stylesheet_directory_uri() . '/js/custom-child.js', array(), '1.0.0', true );
  }
  add_action( 'wp_enqueue_scripts', 'child_theme_scripts' );
Posted on by ElmerCat

After examinating your html code, it could be possible that your comments in the code are causing the error. Look at this:

W3 Validator

You have several code comments that are wrong:

<!– end slider items –>

should be

<!–- end slider items -->

I hope this will fix the issue.

Posted on by Adrian Lambertz

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