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docs/snippets/wasm/plugins/plugin_validator.md

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+# Register Custom Validator Plugin
+
+Register a custom validator that checks extraction results for quality or correctness.
+
+```typescript title="WASM"
+import init, { registerValidator, extractBytes } from "kreuzberg-wasm";
+
+await init();
+
+// Define a custom validator
+const customValidator = {
+  validate: (extractionResult) => {
+    const text = extractionResult.text || "";
+
+    // Check for minimum content
+    if (text.length === 0) {
+      return {
+        valid: false,
+        error: "No text extracted from document",
+      };
+    }
+
+    // Check for suspicious patterns
+    const hasRepeatingChars = /(.)\1{5,}/.test(text);
+    if (hasRepeatingChars) {
+      return {
+        valid: false,
+        error: "Text contains excessive repeating characters (possible OCR error)",
+      };
+    }
+
+    // Check if text is mostly whitespace
+    if (text.trim().length < text.length * 0.5) {
+      return {
+        valid: false,
+        error: "Text is mostly whitespace",
+      };
+    }
+
+    return {
+      valid: true,
+      error: null,
+    };
+  },
+};
+
+try {
+  registerValidator(customValidator);
+  console.log("Custom validator registered");
+} catch (error) {
+  console.error("Failed to register validator:", error);
+}
+
+// Extract and validate
+async function extractAndValidate(fileBytes, mimeType) {
+  const result = await extractBytes(fileBytes, mimeType, {});
+
+  const validation = customValidator.validate(result);
+  if (!validation.valid) {
+    console.warn("Validation failed:", validation.error);
+  } else {
+    console.log("✓ Extraction passed validation");
+  }
+
+  return result;
+}
+```
+
+Validators run after extraction to ensure results meet quality standards.