SyntaxError: missing ) after condition

SyntaxError: missing ) after condition (Firefox)
SyntaxError: Unexpected token '{'. Expected ')' to end an 'if' condition. (Safari)

There is an error with how an if condition is written. In any programming language, code needs to make decisions and carry out actions accordingly depending on different inputs. The if statement executes a statement if a specified condition is truthy. In JavaScript, this condition must appear in parenthesis after the if keyword, like this:

if (condition) {
  // do something if the condition is true
}

It might just be an oversight, carefully check all you parenthesis in your code.

if (Math.PI < 3 {
  console.log("wait what?");
}

// SyntaxError: missing ) after condition

To fix this code, you would need to add a parenthesis that closes the condition.

if (Math.PI < 3) {
  console.log("wait what?");
}

If you are coming from another programming language, it is also easy to add keywords that don't mean the same or have no meaning at all in JavaScript.

if (done is true) {
 console.log("we are done!");
}

// SyntaxError: missing ) after condition

Instead you need to use a correct comparison operator. For example:

if (done === true) {
  console.log("we are done!");
}

Or even better:

if (done) {
  console.log("we are done!");
}

• if...else
• Relational operators
• Making decisions in your code — conditionals