Uncaught syntaxerror expected expression got

Are you stuck with the uncaught syntaxerror expected expression got  in JavaScript?

If this error gives you a hard time don’t worry, we got your back! You just have to continue reading.

In this article, we’ll walk you through how to troubleshoot the uncaught syntaxerror expected expression got ‘<‘ error message.

What is “uncaught syntaxerror: expected expression got”?

The syntaxrror: expected expression got is an error message you might encounter while working with JavaScript.

This error message indicates that the JavaScript interpreter expected to find an expression in your code but instead found something else.

The specific details of the error message will depend on what the JavaScript engine found instead of the expected expression.

This error typically happens when the browser tries to fetch JavaScript files, but instead receives the contents of an HTML file from the server.

For example:

app.all('*', function (req, res) {
  res.sendFile(__dirname+'/index.html') /* <= Where my ng-view is located */
})

In simple words, JavaScript engine expected an expression but got something else instead.

For instance, if the error message is Uncaught SyntaxError: expected expression, got ‘<’ it means that the JavaScript engine expected to find an expression but instead found a ‘<’ character.

This could happen if you accidentally included a ‘<’ character in your code where an expression was expected.

How to fix “uncaught syntaxerror expected expression got”?

To fix the uncaught syntaxerror: expected expression, got error message, you need to identify the specific syntax error in your code that is causing the error message. The details of the error message can provide clues about where to look for the error.

Once you have identified the syntax error, you can fix it by correcting the code. This could involve removing or replacing an incorrect character, adding missing characters or code, or reorganizing your code to ensure that expressions are placed where they are expected.

Here are the following solution which can help you to resolve the error:

Solution 1: Add missing expression

Example 1 Missing expression after an operator

Incorrect code:

function example() {
  var a = 50;
  if (a <) {
    console.log('a is less than 100');
  }
}

Output:

 SyntaxError: expected expression, got ')'

As you can see, the error occurs because the if statement is missing an expression after the < operator. To fix this error, we need to add an expression after the < operator.

Corrected code:

function example() {
  var a = 50;
  if (a < 100) { // fixed
    console.log('a is less than 100');
  }
}

example();

Output:

a is less than 100

Example 2: Incorrect use of a reserved word

Incorrect code:

function example() {
var return = 50; 
}

The error occurs because the variable name return is a reserved word in JavaScript. To fix this error, we need to use a different variable name that is not a reserved word.

Output:

SyntaxError: expected expression, got keyword 'return'

Corrected code:

function example() {
var returnValue = 50; 
console.log(returnValue);
}
example();

Output:

50

Example 3: Missing closing parenthesis

Incorrect code:

function example() {
var a = (50 + 30; 

The error occurs because the expression (50 + 30 is missing a closing parenthesis. To fix this error, we need to add the missing closing parenthesis.

Output:

SyntaxError: expected expression, got ';'
}

Corrected code:

function example() {
var a = (50 + 30); 
console.log(x);
}

example();

Output:

80

Solution 2: Correct any other syntax errors

Incorrect code:

let a = 100;
if (a === 100) 
  console.log("a is equal to 100");
}

The uncaught syntaxerror: expected expression error can also occur due to other syntax errors in your code. In this example, the error might be caused by missing closing curly braces (}) or improper indentation.

By ensuring the correct syntax, the error can be resolved. When a is equal to 100, the message “a is equal to 100” will be logged to the console

let a = 100;
if (a === 100) {
  console.log("a is equal to 100");
}

Output:

a is equal to 100

Conclusion

In conclusion, the syntaxrror: expected expression got is an error message you might encounter while working with JavaScript.

This error message indicates that the JavaScript interpreter expected to find an expression in your code but instead found something else.

This article already discussed what this error is all about and multiple ways to resolve this error.

By executing the solutions above, you can master this SyntaxError with the help of this guide.

You could also check out other SyntaxError articles that may help you in the future if you encounter them.

• Syntaxerror await is only valid in async function
• Syntaxerror missing parentheses in call to print
• Syntaxerror missing initializer in const declaration

We are hoping that this article helps you fix the error. Thank you for reading itsourcecoders 😊