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Node.js received an argument with the wrong type

TypeError [ERR_INVALID_ARG_TYPE]

Node.js threw because an API received a value of the wrong type, such as a string where a Buffer, URL, or function was expected.

ERR_INVALID_ARG_TYPEruntime

Observed message

TypeError [ERR_INVALID_ARG_TYPE]

Why it happens

  • The code passes the wrong JavaScript type into a Node.js API.
  • A value from configuration, user input, or another library is not in the expected format.
  • A refactor changed the value type without updating the API call site.

How to fix it

  1. Inspect the failing call and compare the provided value types with the API contract.
  2. Validate and normalize inputs before passing them to Node.js APIs.
  3. Add narrower typing or runtime checks so bad values fail earlier and more clearly.

Official reference

Node.js Errors: ERR_INVALID_ARG_TYPE

Related errors

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Node.js ERR_INVALID_ARG_TYPE: causes and fixes | Error Atlas