diff --git a/libs/blocks/locui/actions/view.js b/libs/blocks/locui/actions/view.js
index 9396bc32df..55c2d728d0 100644
--- a/libs/blocks/locui/actions/view.js
+++ b/libs/blocks/locui/actions/view.js
@@ -19,6 +19,7 @@ import {
 } from './index.js';
 
 export default function Actions() {
+  const hasErrors = urls.value.filter((url) => !url.valid)?.length > 0;
   const canAct = allowSyncToLangstore.value
               || allowSendForLoc.value
               || allowRollout.value
@@ -27,6 +28,19 @@ export default function Actions() {
   const canReRollAll = languages.value.some((lang) => lang.status === 'completed');
   const canRollAll = languages.value.some((lang) => lang.status === 'translated');
 
+  if (hasErrors) {
+    return html`
+      <div class=locui-section>
+        <div class=locui-section-heading>
+            <div>
+              <h2 class="locui-section-label cancelled">Project has errors</h2>
+              <i>Please fix errors in project to proceed.</i>
+            </div>
+        </div>
+      </div>
+    `;
+  }
+
   if (projectCancelled.value) {
     return html`
       <div class=locui-section>
diff --git a/libs/blocks/locui/loc/index.js b/libs/blocks/locui/loc/index.js
index 9cc540a4be..f61a23b45a 100644
--- a/libs/blocks/locui/loc/index.js
+++ b/libs/blocks/locui/loc/index.js
@@ -23,6 +23,23 @@ const urlParams = new URLSearchParams(window.location.search);
 let resourcePath;
 let previewPath;
 
+async function validatedUrls(projectUrls) {
+  const validateUrls = [...projectUrls];
+  while (validateUrls.length) {
+    try {
+      const reqs = await Promise.all(validateUrls.splice(0, 49).map((url) => fetch(url.href)));
+      setStatus('details', 'info', 'Validating Project URLs');
+      for (const res of reqs) {
+        const projectUrl = projectUrls.find((url) => url.href === res.url);
+        projectUrl.valid = res.ok;
+      }
+    } catch (error) {
+      setStatus('details', 'error', 'There was an error validating project URLs.', error);
+    }
+  }
+  return projectUrls;
+}
+
 export function getUrls(jsonUrls) {
   const { locales } = getConfig();
   // Assume all URLs will be the same locale as the first URL
@@ -84,9 +101,15 @@ async function loadDetails() {
       return rdx;
     }, []);
     languages.value = projectLangs;
-    urls.value = projectUrls;
+    setStatus('details', 'info', 'Validating Project Configuration');
+    urls.value = await validatedUrls(projectUrls);
     if (json.settings) loadProjectSettings(json.settings.data);
-    setStatus('details');
+    const errors = urls.value.filter((url) => !url.valid);
+    if (errors?.length > 0) {
+      setStatus('details', 'error', 'Invalid URLs.', errors.map((url) => (`${url.href} was not found.`)));
+    } else {
+      setStatus('details');
+    }
   } catch {
     setStatus('details', 'error', 'Error loading languages and URLs.');
   }
@@ -99,7 +122,6 @@ async function loadHeading() {
   resourcePath = json.resourcePath;
   previewPath = json.preview.url;
   const path = resourcePath.replace(/\.[^/.]+$/, '');
-  setStatus('details');
   const projectName = json.edit.name.split('.').shift().replace('-', ' ');
   heading.value = { name: projectName, editUrl: json.edit.url, path };
   window.document.title = `${projectName} - LocUI`;
diff --git a/libs/blocks/locui/locui.css b/libs/blocks/locui/locui.css
index 6607d88757..e9592e5b87 100644
--- a/libs/blocks/locui/locui.css
+++ b/libs/blocks/locui/locui.css
@@ -107,6 +107,7 @@ span.locui-sync-badge-mono {
   background-color: #0f7c41;
   height: 26px;
   border-radius: 2px;
+  cursor: pointer;
 }
 
 .locui-status-toast-section {
@@ -421,6 +422,21 @@ li.locui-url {
   border-bottom: 1px solid #ccc;
 }
 
+li.locui-url.error .locui-url-path {
+  color: red;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+li.locui-url.error .locui-url-path span {
+  color: white;
+  background-color: red;
+  border-radius: 5px;
+  padding: 0 5px;
+  font-size: 12px;
+}
+
 li.locui-url:last-child {
   border-bottom: unset;
 }
diff --git a/libs/blocks/locui/url/tabs.js b/libs/blocks/locui/url/tabs.js
index 4e79f0905e..4f82fcf538 100644
--- a/libs/blocks/locui/url/tabs.js
+++ b/libs/blocks/locui/url/tabs.js
@@ -1,4 +1,5 @@
 import { html, signal, useEffect, useMemo } from '../../../deps/htm-preact.js';
+import { urls } from '../utils/state.js';
 import { setActions, openWord, handleAction } from './index.js';
 
 function useSignal(value) {
@@ -8,18 +9,20 @@ function useSignal(value) {
 function Actions({ item }) {
   const isExcel = item.value.path.endsWith('.json') ? ' locui-url-action-edit-excel' : ' locui-url-action-edit-word';
   const isDisabled = (status) => (!status || status !== 200 ? ' disabled' : '');
+  const itemUrl = urls.value.find((url) => url.pathname === item.value.path
+  || url.langstore.pathname === item.value.path);
   return html`
     <div class=locui-url-source-actions>
       <button
         disabled=${item.value.edit?.status === 404}
-        class="locui-url-action locui-url-action-edit${isExcel}"
-        onClick=${(e) => { openWord(e, item); }}>Edit</button>
+        class="locui-url-action locui-url-action-edit${isExcel}${!itemUrl?.valid ? ' disabled' : ''}"
+        onClick=${(e) => { if (itemUrl.valid) openWord(e, item); }}>Edit</button>
       <button
         class="locui-url-action locui-url-action-view${isDisabled(item.value.preview?.status)}"
-        onClick=${(e) => { handleAction(e, item, true); }}>Preview</button>
+        onClick=${(e) => { if (itemUrl.valid) handleAction(e, item, true); }}>Preview</button>
       <button
         class="locui-url-action locui-url-action-view${isDisabled(item.value.live?.status)}"
-        onClick=${(e) => { handleAction(e, item); }}>Live</button>
+        onClick=${(e) => { if (itemUrl.valid) handleAction(e, item); }}>Live</button>
     </div>
   `;
 }
diff --git a/libs/blocks/locui/url/view.js b/libs/blocks/locui/url/view.js
index 7600c2a1fb..29bcd4083f 100644
--- a/libs/blocks/locui/url/view.js
+++ b/libs/blocks/locui/url/view.js
@@ -6,9 +6,9 @@ export default function Url({ suffix, item }) {
   const langstorePath = item.langstore?.pathname;
 
   return html`
-    <li class=locui-url>
+    <li class="locui-url${!item.valid ? ' error' : ''}">
       <h3 class=locui-url-label>Path</h3>
-      <p class=locui-url-path>${sourcePath}</p>
+      <p class=locui-url-path>${sourcePath}${!item.valid ? html`<span>NOT FOUND</span>` : ''}</p>
       <div class="locui-url-tab-group locui-url-tab-group-cols-${suffix.length}">
         <${Tabs} suffix=${suffix[0]} path=${sourcePath} />
         ${langstorePath && html`