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While programming with JavaScript language, there are many chances you may encounter the uncaught syntaxerror: invalid or unexpected token.
The questions are: What causes the problem to happen and how to resolve it the most radically? Scroll down to unwrap the haze yourself!
Why Does The Uncaught SyntaxError: Unexpected token Error Occur?
There are several causes for the “Uncaught SyntaxError: Unexpected token” error. The basic reason is because a certain language construct was expected but something different was delivered.
Let’s check out the list of potential possibilities below to see whether it is your issue that needs to be fixed!
#1. Retrieving an HTML response from a JSON-expected server.
When you try to parse JSON data and make a http call to a server and get back an HTML response, you’ll get this error. You can console to fix this problem.
Guarantee that the answer you’re getting from your server is a proper JSON string that doesn’t contain any HTML elements by logging it.
Alternatively, open your browser’s developer tools, choose the Network tab, and study the answer.
#2. Getting a <script /> tag which directs to a wrong path.
As such, ensure any script tags you utilize lead to a correct path, and rename all your files with lowercase letters exclusively.
Otherwise, if the file name contains capital letters or unusual characters, the error may occur.
#3. Getting a <script /> tag that directs to an HTML file rather than a JS file.
Example:
<!DOCTYPE html>
<html lang="en">
<title>JavaScript Uncaught Syntaxerror: Invalid Or Unexpected Token</title>
<head>
<meta charset="UTF-8" />
</head>
<body>
<script src="index.html"></script> <!-- Getting a <script /> tag that directs to an HTML file rather than a JS file -->
</body>
</html>Output:
Uncaught SyntaxError: Unexpected token#4. Forgetting to close a <script tag.
Example:
<!DOCTYPE html>
<html lang="en">
<title>JavaScript Uncaught Syntaxerror: Invalid Or Unexpected Token</title>
<head>
<meta charset="UTF-8" />
<script
console.log("SyntaxError: Unexpected token'<'");
</script> <!-- Forgetting to close a <script tag -->
</head>
<body></body>
</html>Output:
Uncaught SyntaxError: Unexpected token '<'#5. Missing or having extra brackets, commas or parentheses in your code.
Example:
function result(x, y, z) {
return (x+y)*z;
}} // Having extra brackets
console.log(result(1, 5, 2))Output:
Uncaught SyntaxError: Unexpected token '}'How To Resolve The Uncaught SyntaxError: Unexpected token Error?
- Step 1: Simply delete the javascript code from the error line and check to see whether the error goes away.
- Step 2: To make the update take effect, remember to reload the test.html and test.js files.
- Step 3: You may also paste the line of javascript code where the problem occurs into a text editor like Sublime Text.
- Step 4: Then you may look for the out-of-place character and delete it to remedy the problem.
For example:
<0x200b>// Create a SnowFlakeApp instance when the window is loaded.
window.onload = new SnowFlakeApp();
- Step 5: The character 0x200b> in the javascript code above is abnormal; delete it to correct the issue.
The Bottom Line
Above is our in-depth instruction on how to fix the Uncaught SyntaxError: Unexpected token problem. Hopefully, this article can be of great use for you to get out of such trouble somehow. Don’t forget to leave a comment if you have any concerns regarding other Uncaught SyntaxErrors not yet resolved. See then!
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