diff --git a/src/common-components/data/service.js b/src/common-components/data/service.js
index 65b0305e..a9b26f0f 100644
--- a/src/common-components/data/service.js
+++ b/src/common-components/data/service.js
@@ -16,8 +16,8 @@ export async function getThirdPartyAuthContext(urlParams) {
       throw (e);
     });
   return {
-    fieldDescriptions: data.registrationFields || {},
-    optionalFields: data.optionalFields || {},
-    thirdPartyAuthContext: data.contextData || {},
+    fieldDescriptions: data.registrationFields ?? {},
+    optionalFields: data.optionalFields ?? {},
+    thirdPartyAuthContext: data.contextData ?? {},
   };
 }
diff --git a/src/data/utils/useMobileResponsive.js b/src/data/utils/useMobileResponsive.js
index 20a9ed03..11725942 100644
--- a/src/data/utils/useMobileResponsive.js
+++ b/src/data/utils/useMobileResponsive.js
@@ -10,7 +10,7 @@ import { breakpoints } from '@openedx/paragon';
 const useMobileResponsive = (breakpoint) => {
   const [isMobileWindow, setIsMobileWindow] = useState();
   const checkForMobile = () => {
-    setIsMobileWindow(window.matchMedia(`(max-width: ${breakpoint || breakpoints.small.maxWidth}px)`).matches);
+    setIsMobileWindow(window.matchMedia(`(max-width: ${breakpoint ?? breakpoints.small.maxWidth}px)`).matches);
   };
   useEffect(() => {
     checkForMobile();
diff --git a/src/forgot-password/data/sagas.js b/src/forgot-password/data/sagas.js
index d3aaf147..bf2ffa68 100644
--- a/src/forgot-password/data/sagas.js
+++ b/src/forgot-password/data/sagas.js
@@ -20,7 +20,7 @@ export function* handleForgotPassword(action) {
 
     yield put(forgotPasswordSuccess(action.payload.email));
   } catch (e) {
-    if (e.response && e.response.status === 403) {
+    if (e.response?.status === 403) {
       yield put(forgotPasswordForbidden());
       logInfo(e);
     } else {
diff --git a/src/register/RegistrationFields/EmailField/validator.js b/src/register/RegistrationFields/EmailField/validator.js
index e6658410..203cd17c 100644
--- a/src/register/RegistrationFields/EmailField/validator.js
+++ b/src/register/RegistrationFields/EmailField/validator.js
@@ -63,8 +63,8 @@ export const validateEmailAddress = (value, username, domainName) => {
   const tldSuggestion = !DEFAULT_TOP_LEVEL_DOMAINS.includes(topLevelDomain);
   const serviceSuggestion = getLevenshteinSuggestion(serviceLevelDomain, DEFAULT_SERVICE_PROVIDER_DOMAINS, 2);
 
-  if (DEFAULT_SERVICE_PROVIDER_DOMAINS.includes(serviceSuggestion || serviceLevelDomain)) {
-    suggestion = `${username}@${serviceSuggestion || serviceLevelDomain}.com`;
+  if (DEFAULT_SERVICE_PROVIDER_DOMAINS.includes(serviceSuggestion ?? serviceLevelDomain)) {
+    suggestion = `${username}@${serviceSuggestion ?? serviceLevelDomain}.com`;
   }
 
   if (!hasMultipleSubdomains && tldSuggestion) {
diff --git a/src/register/data/reducers.js b/src/register/data/reducers.js
index 70c3a994..f05d5138 100644
--- a/src/register/data/reducers.js
+++ b/src/register/data/reducers.js
@@ -74,7 +74,7 @@ const reducer = (state = defaultState, action = {}) => {
         registrationError: { ...action.payload },
         submitState: DEFAULT_STATE,
         validations: null,
-        usernameSuggestions: usernameSuggestions || state.usernameSuggestions,
+        usernameSuggestions: usernameSuggestions ?? state.usernameSuggestions,
       };
     }
     case REGISTRATION_CLEAR_BACKEND_ERROR: {
@@ -90,7 +90,7 @@ const reducer = (state = defaultState, action = {}) => {
       return {
         ...state,
         validations: validationWithoutUsernameSuggestions,
-        usernameSuggestions: usernameSuggestions || state.usernameSuggestions,
+        usernameSuggestions: usernameSuggestions ?? state.usernameSuggestions,
       };
     }
     case REGISTER_FORM_VALIDATIONS.FAILURE:
diff --git a/src/register/data/sagas.js b/src/register/data/sagas.js
index 00c02976..120ce442 100644
--- a/src/register/data/sagas.js
+++ b/src/register/data/sagas.js
@@ -44,7 +44,7 @@ export function* fetchRealtimeValidations(action) {
 
     yield put(fetchRealtimeValidationsSuccess(camelCaseObject(fieldValidations)));
   } catch (e) {
-    if (e.response && e.response.status === 403) {
+    if (e.response?.status === 403) {
       yield put(fetchRealtimeValidationsFailure());
       logInfo(e);
     } else {
diff --git a/src/register/data/selectors.js b/src/register/data/selectors.js
index f59e82c2..9e236266 100644
--- a/src/register/data/selectors.js
+++ b/src/register/data/selectors.js
@@ -22,7 +22,7 @@ const getBackendValidations = createSelector(
 
       const validationDecisions = {};
       fields.forEach(field => {
-        validationDecisions[field] = registrationError[field][0].userMessage || '';
+        validationDecisions[field] = registrationError[field][0].userMessage ?? '';
       });
       return validationDecisions;
     }
diff --git a/src/register/data/service.js b/src/register/data/service.js
index de788809..66243716 100644
--- a/src/register/data/service.js
+++ b/src/register/data/service.js
@@ -18,8 +18,8 @@ export async function registerRequest(registrationInformation) {
     });
 
   return {
-    redirectUrl: data.redirect_url || `${getSiteConfig().lmsBaseUrl}/dashboard`,
-    success: data.success || false,
+    redirectUrl: data.redirect_url ?? `${getSiteConfig().lmsBaseUrl}/dashboard`,
+    success: data.success ?? false,
     authenticatedUser: data.authenticated_user,
   };
 }
diff --git a/src/register/data/utils.js b/src/register/data/utils.js
index c75895dd..ff25fb12 100644
--- a/src/register/data/utils.js
+++ b/src/register/data/utils.js
@@ -43,9 +43,7 @@ export const isFormValid = (
   Object.keys(payload).forEach(key => {
     switch (key) {
       case 'name':
-        if (!fieldErrors.name) {
-          fieldErrors.name = validateName(payload.name, formatMessage);
-        }
+        fieldErrors.name ||= validateName(payload.name, formatMessage);
         if (fieldErrors.name) {
           isValid = false;
         }
@@ -71,17 +69,13 @@ export const isFormValid = (
         break;
       }
       case 'username':
-        if (!fieldErrors.username) {
-          fieldErrors.username = validateUsername(payload.username, formatMessage);
-        }
+        fieldErrors.username ||= validateUsername(payload.username, formatMessage);
         if (fieldErrors.username) {
           isValid = false;
         }
         break;
       case 'password':
-        if (!fieldErrors.password) {
-          fieldErrors.password = validatePasswordField(payload.password, formatMessage);
-        }
+        fieldErrors.password ||= validatePasswordField(payload.password, formatMessage);
         if (fieldErrors.password) {
           isValid = false;
         }
diff --git a/src/reset-password/data/sagas.js b/src/reset-password/data/sagas.js
index 1d518efe..c311a6ae 100644
--- a/src/reset-password/data/sagas.js
+++ b/src/reset-password/data/sagas.js
@@ -26,7 +26,7 @@ export function* handleValidateToken(action) {
       yield put(passwordResetFailure(PASSWORD_RESET.INVALID_TOKEN));
     }
   } catch (err) {
-    if (err.response && err.response.status === 429) {
+    if (err.response?.status === 429) {
       yield put(passwordResetFailure(PASSWORD_RESET.FORBIDDEN_REQUEST));
       logInfo(err);
     } else {
@@ -51,7 +51,7 @@ export function* handleResetPassword(action) {
       yield put(resetPasswordFailure(PASSWORD_VALIDATION_ERROR, resetErrors));
     }
   } catch (err) {
-    if (err.response && err.response.status === 429) {
+    if (err.response?.status === 429) {
       yield put(resetPasswordFailure(PASSWORD_RESET.FORBIDDEN_REQUEST));
       logInfo(err);
     } else {