fix: Handle null form field values

Author: felipe-sme

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 -   Updates custom framework to following correct CollectingResponse flow order (to ensure that subsequent calls to the `sendJSONResponse` doesn't overwrite the response).
 -   Updated/expanded plugin support.
 -   Reworked internals to avoid dynamic requires and circular dependencies
+-   Fix signup error when a form field value is null
 
 ## [23.0.1] - 2025-07-31
 

lib/build/recipe/emailpassword/api/utils.js

@@ -109,12 +109,12 @@ async function validateFormOrThrowError(
 
         // Add the not optional error if input is not passed
         // and the field is not optional.
-        const isValidInput =
-            !!input &&
-            ((typeof input.value === "string"
-                ? input.value.length > 0
-                : input.value !== null && typeof input.value !== "undefined") ||
-                (typeof input.value === "object" && Object.values(input.value).length > 0));
+        const hasNonEmptyStringValue = typeof input?.value === "string" && input.value.length > 0;
+        const hasNonNullishNonStringValue =
+            typeof input?.value !== "string" && input?.value !== null && input?.value !== undefined;
+
+        const isValidInput = !!input && (hasNonEmptyStringValue || hasNonNullishNonStringValue);
+
         if (!formField.optional && !isValidInput) {
             validationErrors.push({
                 error: "Field is not optional",