SyntaxError: function statement requires a name

SyntaxError: Function statements require a function name (V8-based) SyntaxError: function statement requires a name (Firefox) SyntaxError: Function statements must have a name. (Safari) 

There is a function statement in the code that requires a name. You'll need to check how functions are defined and if you need to provide a name for it, or if the function in question needs to be a function expression, an IIFE, or if the function code is placed correctly in this context at all.

A function statement (or function declaration) requires a name. This won't work:

function () { return "Hello world"; } // SyntaxError: function statement requires a name 

You can use a function expression (assignment) instead:

const greet = function () { return "Hello world"; }; 

If your function is intended to be an IIFE (Immediately Invoked Function Expression, which is a function that runs as soon as it is defined) you will need to add a few more braces:

(function () { // … })(); 

Labels are an entirely different feature from function names. You can't use a label as a function name.

function Greeter() { german: function () { return "Moin"; } } // SyntaxError: function statement requires a name 

In addition, labeled function declarations themselves are a deprecated feature. Use regular function declarations instead.

function Greeter() { function german() { return "Moin"; } } 

If you intended to create a method of an object, you will need to create an object. The following syntax without a name after the function keyword is valid then.

const greeter = { german: function () { return "Moin"; }, }; 

You can also use the method syntax.

const greeter = { german() { return "Moin"; }, }; 

Also, check your syntax when using callbacks. Braces and commas can quickly get confusing.

promise.then( function () { console.log("success"); }); function () { console.log("error"); } // SyntaxError: function statement requires a name 

Correct would be:

promise.then( function () { console.log("success"); }, function () { console.log("error"); }, ); 

• Functions guide
• function
• function expression
• IIFE
• Labeled statement