diff --git a/src/components/Pastes/CodeEditor.jsx b/src/components/Pastes/CodeEditor.jsx
index 9d9b846..ab5c8e6 100644
--- a/src/components/Pastes/CodeEditor.jsx
+++ b/src/components/Pastes/CodeEditor.jsx
@@ -1,16 +1,29 @@
 import Editor from "@monaco-editor/react";
 import { useTheme } from "@/hooks/useTheme";
-import { useRef } from "react";
+import { useEffect, useRef } from "react";
 import PropTypes from "prop-types";
+import * as monaco from "monaco-editor";
 
-const CodeEditor = ({ className = "", syntax, readOnly, onChange, value }) => {
+const CodeEditor = ({ className = "", syntax, readOnly, onChange, value, editorErrors = [] }) => {
     const { theme } = useTheme();
     const editorRef = useRef(null);
 
-    const onMount = (editor) => {
-        editorRef.current = editor;
-        editor.focus();
-    }
+    useEffect(() => {
+        if (!editorRef.current) return;
+        const model = editorRef.current.getModel();
+        if (!model) return;
+
+        monaco.editor.setModelMarkers(model, "owner", editorErrors.map(err => ({
+            startLineNumber: err.lineNumber,
+            startColumn: 1,
+            endLineNumber: err.lineNumber,
+            endColumn: model.getLineLength(err.lineNumber) + 1,
+            message: err.message,
+            severity: monaco.MarkerSeverity.Error
+        })));
+    }, [editorErrors]);
+
+    const onMount = (editor) => { editorRef.current = editor; editor.focus(); }
 
     return (
         <div className={`code-editor ${className}`}>
@@ -18,7 +31,7 @@ const CodeEditor = ({ className = "", syntax, readOnly, onChange, value }) => {
                 language={syntax || "plaintext"}
                 value={value || ""}
                 theme={theme === "dark" ? "vs-dark" : "vs-light"}
-                onChange={(value) => onChange?.(value)}
+                onChange={onChange}
                 onMount={onMount}
                 options={{
                     minimap: { enabled: false },
@@ -30,10 +43,6 @@ const CodeEditor = ({ className = "", syntax, readOnly, onChange, value }) => {
                     scrollbar: { verticalScrollbarSize: 0 },
                     wordWrap: "on",
                     formatOnPaste: true,
-                    suggest: {
-                        showFields: true,
-                        showFunctions: true,
-                    },
                     readOnly: readOnly || false,
                 }}
             />
@@ -47,6 +56,7 @@ CodeEditor.propTypes = {
     readOnly: PropTypes.bool,
     onChange: PropTypes.func,
     value: PropTypes.string,
+    editorErrors: PropTypes.array,
 };
 
-export default CodeEditor;
+export default CodeEditor;
\ No newline at end of file
diff --git a/src/components/Pastes/PastePanel.jsx b/src/components/Pastes/PastePanel.jsx
index e6590c4..e9cfad8 100644
--- a/src/components/Pastes/PastePanel.jsx
+++ b/src/components/Pastes/PastePanel.jsx
@@ -14,78 +14,76 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 	const { pasteKey } = useParams();
 	const navigate = useNavigate();
 	const { getData } = useDataContext();
-	const [title, setTitle] = useState("");
-	const [content, setContent] = useState("");
-	const [syntax, setSyntax] = useState("");
-	const [burnAfter, setBurnAfter] = useState(false);
-	const [isPrivate, setIsPrivate] = useState(false);
-	const [password, setPassword] = useState("");
+
+	const [formData, setFormData] = useState({
+		title: "",
+		content: "",
+		syntax: "",
+		burnAfter: false,
+		isPrivate: false,
+		password: ""
+	});
+
 	const [selectedPaste, setSelectedPaste] = useState(null);
-	const [error, setError] = useState(null);
+	const [editorErrors, setEditorErrors] = useState([]);
+	const [fieldErrors, setFieldErrors] = useState({});
 	const [showPasswordModal, setShowPasswordModal] = useState(false);
 
-	const handleSubmit = (e) => {
+	const handleSubmit = async (e) => {
 		e.preventDefault();
-		const paste = {
-			title,
-			content,
-			syntax,
-			burnAfter: burnAfter,
-			isPrivate: isPrivate,
-			password: password || null,
-		};
-		if (onSubmit) onSubmit(paste);
-	};
+		setFieldErrors({});
+		setEditorErrors([]);
 
-	const handleSelectPaste = async (key) => {
-		navigate(`/${key}`);
-	};
-
-	const fetchPaste = async (key, pwd = "") => {
-		const url = import.meta.env.MODE === 'production' ? 
-		`https://api.miarma.net/v2/mpaste/pastes/${key}` :
-		`http://localhost:8081/v2/mpaste/pastes/${key}`;
-		
-		const { data, error } = await getData(url, {}, false, {
-			'X-Paste-Password': pwd
-		});
-
-		if (error) {
-			if (error?.status === 401) {
-				setShowPasswordModal(true);
-				return;
+		try {
+			if (onSubmit) await onSubmit(formData);
+		} catch (error) {
+			if (error.status === 422 && error.errors) {
+				const newFieldErrors = {};
+				Object.entries(error.errors).forEach(([field, msg]) => {
+					if (field === "content") {
+						setEditorErrors([{ lineNumber: 1, message: msg }]);
+					} else {
+						newFieldErrors[field] = msg;
+					}
+				});
+				setFieldErrors(newFieldErrors);
 			} else {
-				setError(error);
-				setSelectedPaste(null);
-				return;
+				showError(error);
 			}
 		}
-
-		setError(null);
-		setSelectedPaste(data);
-		setTitle(data.title);
-		setContent(data.content);
-		setSyntax(data.syntax || "plaintext");
 	};
 
-	useEffect(() => {
-		if (pasteKey) fetchPaste(pasteKey);
-	}, [pasteKey]);
+	const handleSelectPaste = async (key) => navigate(`/${key}`);
+
+	const fetchPaste = async (key, pwd = "") => {
+		const url = import.meta.env.MODE === 'production'
+			? `https://api.miarma.net/v2/mpaste/pastes/${key}`
+			: `http://localhost:8081/v2/mpaste/pastes/${key}`;
+
+		const data = await getData(url, { password: pwd }, false);
+
+		if (!data) return;
+
+		setSelectedPaste(data);
+		setFormData({
+			title: data.title ?? "",
+			content: data.content ?? "",
+			syntax: data.syntax || "plaintext",
+			burnAfter: data.burnAfter || false,
+			isPrivate: data.isPrivate || false,
+			password: ""
+		});
+	};
+
+	useEffect(() => { if (pasteKey) fetchPaste(pasteKey); }, [pasteKey]);
+
+	const handleChange = (key, value) => {
+		setFormData(prev => ({ ...prev, [key]: value }));
+	};
 
 	return (
 		<>
 			<div className="paste-panel border-0 flex-fill d-flex flex-column min-h-0 p-3">
-				{error &&
-					<Alert variant="danger" onClose={() => setError(null)} dismissible>
-						<strong>
-							<span className="text-danger">{
-								error.status == 404 ? "404: Paste no encontrada." :
-									"Ha ocurrido un error al cargar la paste."
-							}</span>
-						</strong>
-					</Alert>
-				}
-
 				<Form onSubmit={handleSubmit} className="flex-fill d-flex flex-column min-h-0">
 					<Row className="g-3 flex-fill min-h-0">
 						<Col xs={12} lg={2} className="order-last order-lg-first d-flex flex-column flex-fill min-h-0 overflow-hidden">
@@ -111,10 +109,11 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 						<Col xs={12} lg={7} className="d-flex flex-column flex-fill min-h-0 overflow-hidden">
 							<CodeEditor
 								className="flex-fill custom-border rounded-4 overflow-hidden pt-4 pe-4"
-								syntax={syntax}
+								syntax={formData.syntax}
 								readOnly={!!selectedPaste}
-								onChange={selectedPaste ? undefined : setContent}
-								value={content}
+								onChange={(val) => handleChange("content", val)}
+								value={formData.content ?? ""}
+								editorErrors={editorErrors}
 							/>
 						</Col>
 
@@ -132,10 +131,11 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 									<Form.Control
 										disabled={!!selectedPaste}
 										type="text"
-										placeholder="Título de la paste"
-										value={title}
-										onChange={(e) => setTitle(e.target.value)}
+										value={formData.title}
+										onChange={(e) => handleChange("title", e.target.value)}
+										isInvalid={!!fieldErrors.title}
 									/>
+									<Form.Control.Feedback type="invalid">{fieldErrors.title}</Form.Control.Feedback>
 								</FloatingLabel>
 
 								<FloatingLabel
@@ -149,8 +149,8 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 								>
 									<Form.Select
 										disabled={!!selectedPaste}
-										value={syntax}
-										onChange={(e) => setSyntax(e.target.value)}
+										value={formData.syntax}
+										onChange={(e) => handleChange("syntax", e.target.value)}
 									>
 										<option value="">Sin resaltado</option>
 										<option value="javascript">JavaScript</option>
@@ -189,8 +189,8 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 									disabled={!!selectedPaste}
 									id="burnAfter"
 									label="volátil"
-									checked={burnAfter}
-									onChange={(e) => setBurnAfter(e.target.checked)}
+									checked={formData.burnAfter}
+									onChange={(e) => handleChange("burnAfter", e.target.checked)}
 									className="ms-1 d-flex gap-2 align-items-center"
 								/>
 
@@ -199,13 +199,13 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 									disabled={!!selectedPaste}
 									id="isPrivate"
 									label="privado"
-									checked={isPrivate}
-									onChange={(e) => setIsPrivate(e.target.checked)}
+									checked={formData.isPrivate}
+									onChange={(e) => handleChange("isPrivate", e.target.checked)}
 									className="ms-1 d-flex gap-2 align-items-center"
 								/>
 
-								{isPrivate && (
-									<PasswordInput onChange={(e) => setPassword(e.target.value)} />
+								{formData.isPrivate && (
+									<PasswordInput onChange={(e) => handleChange("password", e.target.value)} />
 								)}
 
 								<div className="d-flex justify-content-end">
@@ -227,7 +227,7 @@ const PastePanel = ({ onSubmit, publicPastes }) => {
 				onClose={() => setShowPasswordModal(false)}
 				onSubmit={(pwd) => {
 					setShowPasswordModal(false);
-					fetchPaste(pasteKey, pwd); // reintentas con la pass
+					fetchPaste(pasteKey, pwd);
 				}}
 			/>
 		</>
diff --git a/src/hooks/useData.js b/src/hooks/useData.js
index 43783f8..9ad7365 100644
--- a/src/hooks/useData.js
+++ b/src/hooks/useData.js
@@ -92,10 +92,10 @@ export const useData = (config, onError) => {
     if (config?.baseUrl) fetchData();
   }, [config, fetchData]);
 
-  const requestWrapper = async (method, endpoint, payload = null, refresh = false, extraHeaders = {}) => {
+  const requestWrapper = async (method, endpoint, payload = null, refresh = false) => {
     try {
       const isFormData = payload instanceof FormData;
-      const headers = { ...getAuthHeaders(isFormData), ...extraHeaders };
+      const headers = getAuthHeaders(isFormData);
       const cfg = { headers };
       let response;
 
@@ -131,7 +131,7 @@ export const useData = (config, onError) => {
     dataLoading,
     dataError,
     clearError,
-    getData: (url, params, refresh = true, headers = {}) => requestWrapper("get", url, params, refresh, headers),
+    getData: (url, params, refresh = true) => requestWrapper("get", url, params, refresh),
     postData: (url, body, refresh = true) => requestWrapper("post", url, body, refresh),
     putData: (url, body, refresh = true) => requestWrapper("put", url, body, refresh),
     deleteData: (url, refresh = true) => requestWrapper("delete", url, null, refresh),