Build Field Errors That Help
Create user-facing field errors that identify the problem and suggest recovery.
A donation form rejects values below the corporate match minimum but shows only a generic banner. Users cannot tell which field failed or how to fix it. Helpful validation: identify the field, explain the rule, preserve the value, and repeat validation on the server. A generic error banner feels easy to implement, but it forces users to diagnose the form themselves and often hides server-side rules. Keep the input Do not clear the amount field after failure; preserve the donor typed value. Preserved input turns correction into a small edit instead of a full restart. Attach the message Render the…
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