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docs/snippets/wasm/plugins/embedding_backend.md

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+# Register Custom Embedding Backend
+
+Register a custom embedding backend that provides vector embeddings for text.
+
+```typescript title="WASM"
+import init, { registerEmbeddingBackend } from "kreuzberg-wasm";
+
+await init();
+
+// Define a custom embedding backend
+const customEmbedding = {
+  dimensions: () => 384,
+  embed: (texts) => {
+    // Return embeddings for each text
+    return texts.map((text) => {
+      // Generate a dummy 384-dimensional vector
+      const vector = new Array(384).fill(0).map((_, i) => Math.sin((text.charCodeAt(0) + i) / 384));
+      return vector;
+    });
+  },
+};
+
+try {
+  registerEmbeddingBackend(customEmbedding);
+  console.log("Custom embedding backend registered");
+} catch (error) {
+  console.error("Failed to register embedding backend:", error);
+}
+```
+
+The embedding backend must implement:
+
+- `dimensions()`: Returns the dimensionality of the embeddings
+- `embed(texts: string[])`: Computes vector embeddings for the given texts