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JavaScript const declaration is missing an initializer

SyntaxError: missing = in const declaration

JavaScript rejected a const declaration because const variables must be initialized when declared.

SyntaxError: missing = in const declarationsyntax

Observed message

SyntaxError: missing = in const declaration

Why it happens

  • A const variable was declared without assigning a value.
  • Generated or edited code removed the initializer accidentally.
  • A destructuring declaration was left incomplete.

How to fix it

  1. Assign a value when declaring the const variable.
  2. Use let instead if the variable cannot be initialized immediately.
  3. Check destructuring syntax and generated code for dropped initializers.

Official reference

MDN: SyntaxError: missing = in const declaration

Related errors

SyntaxError: missing ) after argument listJavaScript call or expression is missing a closing parenthesisSyntaxError: duplicate formal argumentJavaScript function declared the same parameter twiceSyntaxError: Unexpected tokenJavaScript parser hit an unexpected tokenSyntaxError: return not in functionJavaScript return statement is outside a function

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