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JavaScript value is not iterable

TypeError: x is not iterable

JavaScript expected an iterable for spread syntax, for...of, destructuring, or APIs like Promise.all, but received a non-iterable value.

TypeError: x is not iterableruntime

Observed message

TypeError: x is not iterable

Why it happens

  • Code passed a plain object where an iterable was expected.
  • A value is null, undefined, or not implementing Symbol.iterator.
  • A generator function itself was used instead of its returned iterator.

How to fix it

  1. Pass a real iterable such as an array, string, or Map.
  2. Convert objects with Object.keys or Object.entries before iterating.
  3. Check whether you need to call a generator function before iterating over it.

Official reference

MDN: TypeError: x is not iterable

Related errors

ReferenceError: can't access lexical declaration before initializationJavaScript accessed a let or const binding before initializationReferenceError: assignment to undeclared variableJavaScript assigned to an undeclared variableTypeError: class constructors must be invoked with 'new'JavaScript class constructor was called without newRangeError: x can't be converted to BigInt because it isn't an integerJavaScript could not convert a non-integer value to BigInt

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JavaScript x is not iterable: causes and fixes | Error Atlas