How can you validate user input in a Yeoman prompt?

• A. Provide a validate function in each prompt object.
• B. Use a shared validator utility.
• C. Validation is not supported in Yeoman prompts.
• D. Validate by checking answers after generation.

Answer: (A)

In Yeoman prompts, you validate input by providing a validate function on each prompt object. This function runs as the user enters their answer and must return true when the input is valid or return a string with an error message to show feedback and block advancing. This per-prompt validation lets you tailor rules for every piece of input—for example, ensuring a non-empty project name, matching a specific pattern, or checking numeric ranges—before the generator proceeds. If you wanted to reuse the same checks, you could extract them into a shared utility, but the standard and most reliable approach is to attach a validate function to each prompt. Validating after generation is not ideal because it won’t prevent the creation of invalid data or files in the first place.