JavaScript SyntaxError – Missing ) after condition

This JavaScript exception missing ) after condition occurs if there is something wrong with if condition. Parenthesis should be after the if keyword.

Message:

SyntaxError: Expected ')' (Edge)
SyntaxError: missing ) after condition (Firefox)

Error Type:

SyntaxError

Cause of Error: Somewhere in the code there is something wrong with if condition how it is written. The condition should have written within the parenthesis.

Case 1: Missing Closing Parenthesis

Error Cause:

A common cause is simply forgetting to include the closing parenthesis at the end of a condition.

Example:

if (x > 10 {
    console.log("This will cause an error.");
}

Output:

SyntaxError: Missing ) after condition

Resolution of Error:

Add the missing closing parenthesis.

let x = 15;
if (x > 10) { // Correct usage
    console.log("Condition is true.");
}

Condition is true.

Case 2: Misplaced Closing Parenthesis

Error Cause:

Another cause is placing the closing parenthesis incorrectly, leading to a misinterpretation of the condition.

Example:

while (x < 10 {
    console.log("This will cause an error.");
) }

Output:

SyntaxError: Missing ) after condition

Resolution of Error:

Ensure that the closing parenthesis correctly matches the opening parenthesis and is in the correct position.

let x = 1;
while (x < 10) { // Correct usage
    console.log("Condition is true.");
    x++;
}

Condition is true.
Condition is true.
Condition is true.
Condition is true.
Condition is true.
Condition is true.
Condition is true.
Condition is true.
Condition is true.

Case 3: Complex Conditions

Error Cause:

When defining complex conditions, a missing closing parenthesis in one of the sub-conditions can cause this error.

Example:

if ((x > 10 && y < 5) || (z === 3 {
    console.log("This will cause an error.");
}

Output:

SyntaxError: Missing ) after condition

Resolution of Error:

Ensure that all sub-conditions have correctly balanced parentheses.

let x = 15;
let y = 3;
let z = 3;
if ((x > 10 && y < 5) || (z === 3)) { // Correct usage
    console.log("Condition is true.");
}

Condition is true.