When developing backend functionalities with Next.js, particularly around form submissions, encountering a TypeError can signal issues in your action function definitions. A common cause is the improper handling or missing export of the action intended for form submission. Ensure that the function designed to process this logic is correctly defined and accessible to the component file, especially when using Next.js 15 with features like Server Actions. Understanding flow and context in which these components operate is key to resolving such errors efficiently.
"The TypeError: action is not a function typically indicates that the submitted action, expected to handle form submissions, might not be correctly defined or passed down in your components."
"When working with Server Actions in Next.js, ensure that the action function is properly exported and accessible in the component where you are trying to use it."
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