diff --git a/plugos/lib/kv_primitives.ts b/plugos/lib/kv_primitives.ts
index 488ddb4d..81a85cc3 100644
--- a/plugos/lib/kv_primitives.ts
+++ b/plugos/lib/kv_primitives.ts
@@ -11,46 +11,3 @@ export interface KvPrimitives {
   query(options: KvQueryOptions): AsyncIterableIterator<KV>;
   close(): void;
 }
-
-/**
- * Turns any KvPrimitives into a KvPrimitives that automatically prefixes all keys (and removes them again when reading)
- */
-export class PrefixedKvPrimitives implements KvPrimitives {
-  constructor(private wrapped: KvPrimitives, private prefix: KvKey) {
-  }
-
-  batchGet(keys: KvKey[]): Promise<any[]> {
-    return this.wrapped.batchGet(keys.map((key) => this.applyPrefix(key)));
-  }
-
-  batchSet(entries: KV[]): Promise<void> {
-    return this.wrapped.batchSet(
-      entries.map(({ key, value }) => ({ key: this.applyPrefix(key), value })),
-    );
-  }
-
-  batchDelete(keys: KvKey[]): Promise<void> {
-    return this.wrapped.batchDelete(keys.map((key) => this.applyPrefix(key)));
-  }
-
-  async *query(options: KvQueryOptions): AsyncIterableIterator<KV> {
-    for await (
-      const result of this.wrapped.query({
-        prefix: this.applyPrefix(options.prefix),
-      })
-    ) {
-      yield { key: this.stripPrefix(result.key), value: result.value };
-    }
-  }
-  close(): void {
-    this.wrapped.close();
-  }
-
-  private applyPrefix(key?: KvKey): KvKey {
-    return [...this.prefix, ...(key ? key : [])];
-  }
-
-  private stripPrefix(key: KvKey): KvKey {
-    return key.slice(this.prefix.length);
-  }
-}
diff --git a/plugos/lib/memory_kv_primitives.test.ts b/plugos/lib/memory_kv_primitives.test.ts
new file mode 100644
index 00000000..b9458873
--- /dev/null
+++ b/plugos/lib/memory_kv_primitives.test.ts
@@ -0,0 +1,8 @@
+import { allTests } from "./kv_primitives.test.ts";
+import { MemoryKvPrimitives } from "./memory_kv_primitives.ts";
+
+Deno.test("Test Memory KV Primitives", async () => {
+  const db = new MemoryKvPrimitives();
+  await allTests(db);
+  db.close();
+});
diff --git a/plugos/lib/memory_kv_primitives.ts b/plugos/lib/memory_kv_primitives.ts
new file mode 100644
index 00000000..c06c0378
--- /dev/null
+++ b/plugos/lib/memory_kv_primitives.ts
@@ -0,0 +1,57 @@
+import { KV, KvKey } from "$sb/types.ts";
+import { KvPrimitives, KvQueryOptions } from "./kv_primitives.ts";
+
+const memoryKeySeparator = "\0";
+
+export class MemoryKvPrimitives implements KvPrimitives {
+  protected store = new Map<string, any>();
+
+  batchGet(keys: KvKey[]): Promise<any[]> {
+    return Promise.resolve(
+      keys.map((key) => this.store.get(key.join(memoryKeySeparator))),
+    );
+  }
+
+  batchSet(entries: KV[]): Promise<void> {
+    for (const { key, value } of entries) {
+      this.store.set(key.join(memoryKeySeparator), value);
+    }
+    return Promise.resolve();
+  }
+
+  batchDelete(keys: KvKey[]): Promise<void> {
+    for (const key of keys) {
+      this.store.delete(key.join(memoryKeySeparator));
+    }
+    return Promise.resolve();
+  }
+
+  toJSON(): Record<string, any> {
+    const result: Record<string, any> = {};
+    for (const [key, value] of this.store) {
+      result[key] = value;
+    }
+    return result;
+  }
+
+  static fromJSON(json: Record<string, any>): MemoryKvPrimitives {
+    const result = new MemoryKvPrimitives();
+    for (const key of Object.keys(json)) {
+      result.store.set(key, json[key]);
+    }
+    return result;
+  }
+
+  async *query(options: KvQueryOptions): AsyncIterableIterator<KV> {
+    const prefix = options.prefix?.join("/");
+    for (const [key, value] of this.store) {
+      if (prefix && !key.startsWith(prefix)) {
+        continue;
+      }
+      yield { key: key.split(memoryKeySeparator), value };
+    }
+  }
+
+  close(): void {
+  }
+}
diff --git a/plugos/lib/prefixed_kv_primitives.ts b/plugos/lib/prefixed_kv_primitives.ts
new file mode 100644
index 00000000..e153d066
--- /dev/null
+++ b/plugos/lib/prefixed_kv_primitives.ts
@@ -0,0 +1,45 @@
+import { KV, KvKey } from "$sb/types.ts";
+import { KvPrimitives, KvQueryOptions } from "./kv_primitives.ts";
+
+/**
+ * Turns any KvPrimitives into a KvPrimitives that automatically prefixes all keys (and removes them again when reading)
+ */
+export class PrefixedKvPrimitives implements KvPrimitives {
+  constructor(private wrapped: KvPrimitives, private prefix: KvKey) {
+  }
+
+  batchGet(keys: KvKey[]): Promise<any[]> {
+    return this.wrapped.batchGet(keys.map((key) => this.applyPrefix(key)));
+  }
+
+  batchSet(entries: KV[]): Promise<void> {
+    return this.wrapped.batchSet(
+      entries.map(({ key, value }) => ({ key: this.applyPrefix(key), value })),
+    );
+  }
+
+  batchDelete(keys: KvKey[]): Promise<void> {
+    return this.wrapped.batchDelete(keys.map((key) => this.applyPrefix(key)));
+  }
+
+  async *query(options: KvQueryOptions): AsyncIterableIterator<KV> {
+    for await (
+      const result of this.wrapped.query({
+        prefix: this.applyPrefix(options.prefix),
+      })
+    ) {
+      yield { key: this.stripPrefix(result.key), value: result.value };
+    }
+  }
+  close(): void {
+    this.wrapped.close();
+  }
+
+  private applyPrefix(key?: KvKey): KvKey {
+    return [...this.prefix, ...(key ? key : [])];
+  }
+
+  private stripPrefix(key: KvKey): KvKey {
+    return key.slice(this.prefix.length);
+  }
+}