The answer
Store the fields in an array in state, render them with stable unique keys, and add or remove fields by updating the array immutably. Never mutate the array directly; always create a new one.
Managing Form State in a Real React App: Patterns That Work
How do I handle dynamic fields in a React form?
More FAQs in Managing Form State in a Real React App: Patterns That Work
Store all field values in a single state object, use one handler for all fields that updates by field name, validate on change or blur, keep inputs controlled, handle dynamic fields with arrays and stable keys, and reset on submit.
No. For forms with many fields, store all values in a single state object and update one field at a time immutably. This is cleaner than separate state for every field and makes submission easier.
Use a single handler that reads the field name from the event target and updates the corresponding key in the state object. This avoids writing a separate handler for every field and scales to any number of fields.
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