diff --git a/package-lock.json b/package-lock.json
index 30134ef3..a8842f53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22067,12 +22067,14 @@
         "@angular/router": "^16.2.0",
         "@materia-ui/ngx-monaco-editor": "^6.0.0",
         "@portugol-webstudio/antlr": "*",
+        "@portugol-webstudio/parser": "*",
         "@portugol-webstudio/resources": "*",
         "@portugol-webstudio/runner": "*",
         "@portugol-webstudio/runtime": "*",
         "@sentry/angular-ivy": "^7.62.0",
         "angular-split": "^15.0.0",
         "angular-svg-icon": "^16.0.0",
+        "antlr4ts": "^0.5.0-alpha.4",
         "assert": "^2.0.0",
         "file-saver": "^2.0.5",
         "firebase": "^9.23.0",
@@ -22106,6 +22108,7 @@
       }
     },
     "packages/parser": {
+      "name": "@portugol-webstudio/parser",
       "version": "0.0.0",
       "license": "GPL-3.0",
       "dependencies": {
@@ -22218,7 +22221,6 @@
       "license": "GPL-3.0",
       "dependencies": {
         "@portugol-webstudio/antlr": "*",
-        "@portugol-webstudio/parser": "*",
         "@sentry/core": "^7.62.0",
         "antlr4ts": "^0.5.0-alpha.4"
       },
diff --git a/packages/ide/package.json b/packages/ide/package.json
index 3a42c7ef..42e578be 100644
--- a/packages/ide/package.json
+++ b/packages/ide/package.json
@@ -42,12 +42,14 @@
     "@angular/router": "^16.2.0",
     "@materia-ui/ngx-monaco-editor": "^6.0.0",
     "@portugol-webstudio/antlr": "*",
+    "@portugol-webstudio/parser": "*",
     "@portugol-webstudio/resources": "*",
     "@portugol-webstudio/runner": "*",
     "@portugol-webstudio/runtime": "*",
     "@sentry/angular-ivy": "^7.62.0",
     "angular-split": "^15.0.0",
     "angular-svg-icon": "^16.0.0",
+    "antlr4ts": "^0.5.0-alpha.4",
     "assert": "^2.0.0",
     "file-saver": "^2.0.5",
     "firebase": "^9.23.0",
diff --git a/packages/ide/src/app/tab-editor/tab-editor.component.scss b/packages/ide/src/app/tab-editor/tab-editor.component.scss
index 58aa308f..752cdbf7 100644
--- a/packages/ide/src/app/tab-editor/tab-editor.component.scss
+++ b/packages/ide/src/app/tab-editor/tab-editor.component.scss
@@ -9,6 +9,13 @@
   height: 100%;
 }
 
+::ng-deep .editor-inner {
+  .monaco-editor .monaco-hover {
+    position: fixed;
+    z-index: 9999;
+  }
+}
+
 .editor-inner {
   background-color: shade($background-200, 15);
   flex-grow: 1;
diff --git a/packages/ide/src/app/tab-editor/tab-editor.component.ts b/packages/ide/src/app/tab-editor/tab-editor.component.ts
index 25b794df..f901b290 100644
--- a/packages/ide/src/app/tab-editor/tab-editor.component.ts
+++ b/packages/ide/src/app/tab-editor/tab-editor.component.ts
@@ -11,14 +11,16 @@ import {
 } from "@angular/core";
 import { uploadString, ref, Storage } from "@angular/fire/storage";
 import { MatSnackBar } from "@angular/material/snack-bar";
-import { PortugolSyntaxError } from "@portugol-webstudio/antlr";
+import { PortugolLexer, PortugolParser, PortugolSyntaxError } from "@portugol-webstudio/antlr";
+import { PortugolNode, ParseError } from "@portugol-webstudio/parser";
 import { PortugolExecutor, PortugolWebWorkersRunner } from "@portugol-webstudio/runner";
 import { PortugolJsRuntime } from "@portugol-webstudio/runtime";
 import { captureException, setExtra } from "@sentry/angular-ivy";
+import { CharStreams, CommonTokenStream } from "antlr4ts";
 import { saveAs } from "file-saver";
 import { ShortcutInput } from "ng-keyboard-shortcuts";
 import { GoogleAnalyticsService } from "ngx-google-analytics";
-import { Subscription } from "rxjs";
+import { Subscription, debounceTime, fromEventPattern } from "rxjs";
 import { TextEncoder } from "text-encoding";
 
 @Component({
@@ -27,6 +29,7 @@ import { TextEncoder } from "text-encoding";
   styleUrls: ["./tab-editor.component.scss"],
 })
 export class TabEditorComponent implements OnInit, OnDestroy {
+  private _code$?: Subscription;
   private _stdOut$?: Subscription;
   private _events$?: Subscription;
 
@@ -139,8 +142,9 @@ export class TabEditorComponent implements OnInit, OnDestroy {
   }
 
   ngOnDestroy() {
-    this._stdOut$?.unsubscribe();
+    this._code$?.unsubscribe();
     this._events$?.unsubscribe();
+    this._stdOut$?.unsubscribe();
     this.executor.stop();
   }
 
@@ -279,6 +283,40 @@ export class TabEditorComponent implements OnInit, OnDestroy {
   onEditorInit(editor: monaco.editor.IStandaloneCodeEditor) {
     this.codeEditor = editor;
     this.initShortcuts(editor);
+
+    this._code$?.unsubscribe();
+
+    this._code$ = fromEventPattern(editor.onDidChangeModelContent)
+      .pipe(debounceTime(1000))
+      .subscribe(() => {
+        const code = this.code;
+
+        if (code) {
+          try {
+            const inputStream = CharStreams.fromString(code);
+            const lexer = new PortugolLexer(inputStream);
+            const tokenStream = new CommonTokenStream(lexer);
+            const parser = new PortugolParser(tokenStream);
+
+            new PortugolNode().visit(parser.arquivo());
+            this.setEditorErrors([]);
+          } catch (error) {
+            if (error instanceof ParseError && error.ctx.parent) {
+              const { _start, _stop } = error.ctx.parent as unknown as { _start: any; _stop: any };
+
+              this.setEditorErrors([
+                new PortugolSyntaxError(
+                  _start._line,
+                  _stop._line,
+                  _start._charPositionInLine + 1,
+                  _stop._charPositionInLine + 1 + error.ctx.text.length,
+                  error.message,
+                ),
+              ]);
+            }
+          }
+        }
+      });
   }
 
   openHelp() {
diff --git a/packages/ide/src/app/tab-start/tab-start.component.html b/packages/ide/src/app/tab-start/tab-start.component.html
index 6fdd028d..073ea627 100644
--- a/packages/ide/src/app/tab-start/tab-start.component.html
+++ b/packages/ide/src/app/tab-start/tab-start.component.html
@@ -77,6 +77,7 @@
   <hr />
 
   <h4>📰&nbsp;&nbsp;Novidades</h4>
+  <p><strong>02/09/2023:</strong> Verificação básica de erros no editor.</p>
   <p>
     <strong>10/08/2023:</strong>
   </p>
@@ -95,7 +96,6 @@ <h4>📰&nbsp;&nbsp;Novidades</h4>
   </ul>
 
   <p><strong>10/12/2022:</strong> Correção no comportamento da concatenação.</p>
-  <p><strong>12/11/2022:</strong> Correção na verificação de tipos de argumentos de funções.</p>
 </section>
 
 <footer>
diff --git a/packages/parser/src/index.ts b/packages/parser/src/index.ts
index d81a2e47..58f2ac14 100644
--- a/packages/parser/src/index.ts
+++ b/packages/parser/src/index.ts
@@ -1,2 +1,4 @@
+export * from "./helpers/ParseError.js";
+export * from "./helpers/Tipo.js";
 export * from "./nodes/index.js";
 export * from "./PortugolNode.js";
diff --git a/packages/parser/src/nodes/Node.ts b/packages/parser/src/nodes/Node.ts
index 49e0a1f7..6cd100c4 100644
--- a/packages/parser/src/nodes/Node.ts
+++ b/packages/parser/src/nodes/Node.ts
@@ -9,8 +9,15 @@ export abstract class Node {
   children: Node[];
 
   unexpectedChild(child: Node) {
+    const childName = child.ctx.constructor.name.replace("Context", "");
+    const parentName = this.ctx.constructor.name.replace("Context", "");
+
+    if (childName === "ErrorNode") {
+      throw new ParseError(`Expressão inválida: ${child.ctx.text}`, child.ctx);
+    }
+
     throw new ParseError(
-      `Encontrado ${child.ctx.constructor.name} como filho de ${this.ctx.constructor.name}, não esperado: ${child.ctx.text}`,
+      `Encontrado '${childName}' como filho de '${parentName}', não esperado: '${child.ctx.text}'`,
       child.ctx,
     );
   }