diff --git a/src/livecodes/compiler/compile.worker.ts b/src/livecodes/compiler/compile.worker.ts
index 6dc87c0e64..34180d33f4 100644
--- a/src/livecodes/compiler/compile.worker.ts
+++ b/src/livecodes/compiler/compile.worker.ts
@@ -1,8 +1,15 @@
 import type TS from 'typescript';
 import { getCompilerOptions } from '../editor/ts-compiler-options';
 import { languages, processors } from '../languages';
-import type { CompileOptions, Compilers, Config, EditorLibrary, Language } from '../models';
-import { doOnce, objectFilter } from '../utils/utils';
+import type {
+  CompileOptions,
+  CompileResult,
+  Compilers,
+  Config,
+  EditorLibrary,
+  Language,
+} from '../models';
+import { doOnce, getErrorMessage, objectFilter } from '../utils/utils';
 import { codeMirrorBaseUrl, comlinkBaseUrl, vendorsBaseUrl } from '../vendors';
 import { getAllCompilers } from './get-all-compilers';
 import type { CompilerMessage, CompilerMessageEvent, LanguageOrProcessor } from './models';
@@ -98,13 +105,16 @@ const compile = async (
     throw new Error('Failed to load compiler for: ' + language);
   }
 
-  let value;
+  let value: string | CompileResult = '';
   try {
     value = await compiler(content, { config, language, baseUrl, options });
-  } catch (err) {
+  } catch (err: unknown) {
     // eslint-disable-next-line no-console
     console.error('Failed compiling: ' + language, err);
-    value = content;
+    value = {
+      code: '',
+      info: { errors: [getErrorMessage(err)] },
+    };
   }
   return value || '';
 };
diff --git a/src/livecodes/core.ts b/src/livecodes/core.ts
index 7bcc96f616..84cd3fb019 100644
--- a/src/livecodes/core.ts
+++ b/src/livecodes/core.ts
@@ -996,7 +996,7 @@ const getResultPage = async ({
     },
   };
 
-  const compileResults = await Promise.all([
+  const [styleCompileResult, testsCompileResult] = await Promise.all([
     compiler.compile(styleContent, styleLanguage, config, {
       html: `${compiledMarkup}<script type="script-for-styles">${compiledScript}</script>
         <script type="script-for-styles">${compileInfo.importedContent}</script>`,
@@ -1008,8 +1008,7 @@ const getResultPage = async ({
         : compiler.compile(testsContent, testsLanguage, config, {})
       : Promise.resolve(getCompileResult(getCache().tests?.compiled || '')),
   ]);
-
-  const [compiledStyle, compiledTests] = compileResults.map((result) => {
+  const [compiledStyle, compiledTests] = [styleCompileResult, testsCompileResult].map((result) => {
     const { code, info } = getCompileResult(result);
     compileInfo = {
       ...compileInfo,
@@ -1027,10 +1026,12 @@ const getResultPage = async ({
     markup: {
       ...contentConfig.markup,
       compiled: compiledMarkup,
+      modified: compiledMarkup,
     },
     style: {
       ...contentConfig.style,
       compiled: compiledStyle,
+      modified: compiledStyle,
     },
     script: {
       ...contentConfig.script,
@@ -1045,6 +1046,7 @@ const getResultPage = async ({
       compiled: compiledTests,
     },
   };
+  compiledCode.script.modified = compiledCode.script.compiled;
 
   if (scriptType != null && scriptType !== 'module') {
     singleFile = true;
@@ -1063,6 +1065,14 @@ const getResultPage = async ({
 
   const styleOnlyUpdate = sourceEditor === 'style' && !compileInfo.cssModules;
 
+  const logError = (language: Language, errors: string[] = []) => {
+    errors.forEach((err) => toolsPane?.console?.error(`[${getLanguageTitle(language)}] ${err}`));
+  };
+  logError(markupLanguage, markupCompileResult.info?.errors);
+  logError(styleLanguage, styleCompileResult.info?.errors);
+  logError(scriptLanguage, scriptCompileResult.info?.errors);
+  logError(testsLanguage, getCompileResult(testsCompileResult).info?.errors);
+
   if (singleFile) {
     setCache({
       ...getCache(),
@@ -1124,17 +1134,9 @@ const flushResult = () => {
     wat: ';; loading',
   };
 
-  updateCache(
-    'markup',
-    compiledLanguages.markup,
-    loadingComments[compiledLanguages.markup] || 'html',
-  );
-  updateCache('style', compiledLanguages.style, loadingComments[compiledLanguages.style] || 'css');
-  updateCache(
-    'script',
-    compiledLanguages.script,
-    loadingComments[compiledLanguages.script] || 'javascript',
-  );
+  updateCache('markup', compiledLanguages.markup, loadingComments[compiledLanguages.markup] ?? '');
+  updateCache('style', compiledLanguages.style, loadingComments[compiledLanguages.style] ?? '');
+  updateCache('script', compiledLanguages.script, loadingComments[compiledLanguages.script] ?? '');
   setCache({
     ...getCache(),
     tests: {
diff --git a/src/livecodes/languages/gleam/lang-gleam-compiler.ts b/src/livecodes/languages/gleam/lang-gleam-compiler.ts
index 0169309262..6210085474 100644
--- a/src/livecodes/languages/gleam/lang-gleam-compiler.ts
+++ b/src/livecodes/languages/gleam/lang-gleam-compiler.ts
@@ -2,6 +2,7 @@
 
 /* eslint-disable max-classes-per-file */
 import type { CompilerFunction } from '../../models';
+import { getErrorMessage } from '../../utils/utils';
 import { gleamBaseUrl } from '../../vendors';
 import { getLanguageCustomSettings } from '../utils';
 import { modules, type Modules } from './gleam-modules';
@@ -193,7 +194,10 @@ import { modules, type Modules } from './gleam-modules';
     } catch (error) {
       // eslint-disable-next-line no-console
       console.warn(error);
-      return '';
+      return {
+        code: '',
+        info: { errors: [getErrorMessage(error)] },
+      };
     } finally {
       project.delete();
     }
diff --git a/src/livecodes/languages/svelte/lang-svelte-compiler.ts b/src/livecodes/languages/svelte/lang-svelte-compiler.ts
index ae2f44200c..8151f59fa9 100644
--- a/src/livecodes/languages/svelte/lang-svelte-compiler.ts
+++ b/src/livecodes/languages/svelte/lang-svelte-compiler.ts
@@ -2,6 +2,7 @@ import { compileAllBlocks } from '../../compiler/compile-blocks';
 import { createImportMap, replaceSFCImports } from '../../compiler/import-map';
 import { getCompileResult } from '../../compiler/utils';
 import type { CompilerFunction, Config, Language } from '../../models';
+import { getErrorMessage } from '../../utils/utils';
 import { getLanguageByAlias, getLanguageCustomSettings } from '../utils';
 
 (self as any).createSvelteCompiler = (): CompilerFunction => {
@@ -9,6 +10,7 @@ import { getLanguageByAlias, getLanguageCustomSettings } from '../utils';
   const SECONDARY_FILE = '__LiveCodes_Component__.svelte';
   let importedContent = '';
   let imports: Record<string, string> = {};
+  let errors: string[] = [];
 
   const compileSvelteSFC = async (
     code: string,
@@ -42,21 +44,32 @@ import { getLanguageByAlias, getLanguageCustomSettings } from '../utils';
     });
     const customSettings = getLanguageCustomSettings('svelte', config);
 
-    const { js } = (window as any).svelte.compile(processedCode, {
-      css: 'injected',
-      filename,
-      ...customSettings,
-    });
-
     if (filename === MAIN_FILE || filename === SECONDARY_FILE) {
       imports = createImportMap(importedContent, config);
+      errors = [];
+    }
+
+    let js: { code: string };
+    try {
+      const result = (window as any).svelte.compile(processedCode, {
+        css: 'injected',
+        filename,
+        ...customSettings,
+      });
+      js = result.js;
+    } catch (err) {
+      errors.push(getErrorMessage(err));
+      return {
+        code: '',
+        info: { errors },
+      };
     }
 
     const compiledCode = filename === MAIN_FILE ? getMountCode(js.code) : js.code;
     return {
       code:
         language === 'svelte-app' ? `<script type="module">${compiledCode}</script>` : compiledCode,
-      info: { importedContent, imports },
+      info: { importedContent, imports, errors },
     };
   };
 
diff --git a/src/livecodes/languages/vue/lang-vue-compiler.ts b/src/livecodes/languages/vue/lang-vue-compiler.ts
index a7c5f8e5c0..212947a217 100644
--- a/src/livecodes/languages/vue/lang-vue-compiler.ts
+++ b/src/livecodes/languages/vue/lang-vue-compiler.ts
@@ -3,7 +3,7 @@ import { compileInCompiler } from '../../compiler/compile-in-compiler';
 import { createImportMap, replaceSFCImports } from '../../compiler/import-map';
 import type { LanguageOrProcessor } from '../../compiler/models';
 import type { CompilerFunction, Config } from '../../models';
-import { getRandomString, replaceAsync } from '../../utils/utils';
+import { getErrorMessage, getRandomString, replaceAsync } from '../../utils/utils';
 import { getLanguageByAlias } from '../utils';
 
 // based on:
@@ -363,35 +363,48 @@ import { getLanguageByAlias } from '../utils';
   }
 
   return async (code, { config, language }) => {
-    const isMainFile = config.markup.language !== 'vue-app' || language === 'vue-app';
-    const filename = isMainFile ? MAIN_FILE : SECONDARY_FILE;
-    const result = await compileVueSFC(code, { config, filename });
+    try {
+      const isMainFile = config.markup.language !== 'vue-app' || language === 'vue-app';
+      const filename = isMainFile ? MAIN_FILE : SECONDARY_FILE;
+      const result = await compileVueSFC(code, { config, filename });
 
-    if (result) {
-      const { css, js } = result;
+      if (result) {
+        const { css, js } = result;
 
-      const injectCSS = !css.trim()
-        ? ''
-        : `
+        const injectCSS = !css.trim()
+          ? ''
+          : `
 document.head.insertBefore(
   Object.assign(document.createElement('style'), { textContent: ${JSON.stringify(css)} }),
   document.head.getElementsByTagName('style')[0]
 );
 `;
-      const compiledCode = js + injectCSS;
+        const compiledCode = js + injectCSS;
+
+        return {
+          code:
+            language === 'vue-app'
+              ? `<script type="module">${compiledCode}</script>`
+              : compiledCode,
+          info: { importedContent, imports: createImportMap(importedContent, config), errors },
+        };
+      }
+
+      if (errors.length) {
+        // eslint-disable-next-line no-console
+        console.error(...errors);
+      }
 
+      const empty = `export default () => {}`;
       return {
-        code:
-          language === 'vue-app' ? `<script type="module">${compiledCode}</script>` : compiledCode,
-        info: { importedContent, imports: createImportMap(importedContent, config) },
+        code: language === 'vue-app' ? `<script type="module">${empty}</script>` : empty,
+        info: { errors },
+      };
+    } catch (err) {
+      return {
+        code: '',
+        info: { errors: [...errors, getErrorMessage(err)] },
       };
     }
-
-    if (errors.length) {
-      // eslint-disable-next-line no-console
-      console.error(...errors);
-    }
-
-    return '';
   };
 };
diff --git a/src/livecodes/utils/utils.ts b/src/livecodes/utils/utils.ts
index 518bca4a05..9dc8480396 100644
--- a/src/livecodes/utils/utils.ts
+++ b/src/livecodes/utils/utils.ts
@@ -643,6 +643,15 @@ export const compareObjects = /* @__PURE__ */ (
   return diff;
 };
 
+export const getErrorMessage = /* @__PURE__ */ (err: unknown): string => {
+  if (err == null) return '';
+  if (err instanceof Error) return err.message;
+  if (err && typeof err === 'object' && 'message' in err && typeof err.message === 'string') {
+    return err.message;
+  }
+  return String(err);
+};
+
 export const predefinedValues = {
   APP_VERSION: process.env.VERSION || '',
   SDK_VERSION: process.env.SDK_VERSION || '',
diff --git a/src/sdk/models.ts b/src/sdk/models.ts
index e6bd21a015..50695a9bdd 100644
--- a/src/sdk/models.ts
+++ b/src/sdk/models.ts
@@ -1291,6 +1291,7 @@ export interface CompileInfo {
   modifiedHTML?: string;
   importedContent?: string;
   imports?: Record<string, string>;
+  errors?: string[];
 }
 
 export interface CompileResult {