diff --git a/core/js/src/main/scala/works/iterative/core/service/impl/JsStorageRepository.scala b/core/js/src/main/scala/works/iterative/core/service/impl/JsStorageRepository.scala
new file mode 100644
index 0000000..0582cb5
--- /dev/null
+++ b/core/js/src/main/scala/works/iterative/core/service/impl/JsStorageRepository.scala
@@ -0,0 +1,25 @@
+package works.iterative.core.service.impl
+
+import org.scalajs.dom.Storage
+import works.iterative.core.service.Repository
+import zio.*
+import zio.json.*
+
+// TODO: improve error reporting on generic repositories
+// This is good just for prototypes
+class JsStorageRepository[Value: JsonCodec](storage: Storage)
+    extends Repository[String, Value]:
+
+  override def find(id: String): UIO[Option[Value]] = {
+    for
+      raw <- ZIO.attemptBlocking(Option(storage.getItem(id)))
+      data <- ZIO.foreach(raw) { r =>
+        ZIO
+          .fromEither(r.fromJson[Value])
+          .mapError(_ => new RuntimeException(s"Failed to parse: ${raw}"))
+      }
+    yield data
+  }.orDie
+
+  override def save(key: String, value: Value): UIO[Unit] =
+    ZIO.attemptBlocking(storage.setItem(key, value.toJson)).orDie

diff --git a/core/js/src/main/scala/works/iterative/core/service/impl/JsStorageRepository.scala b/core/js/src/main/scala/works/iterative/core/service/impl/JsStorageRepository.scala
new file mode 100644
index 0000000..0582cb5
--- /dev/null
+++ b/core/js/src/main/scala/works/iterative/core/service/impl/JsStorageRepository.scala
@@ -0,0 +1,25 @@
+package works.iterative.core.service.impl
+
+import org.scalajs.dom.Storage
+import works.iterative.core.service.Repository
+import zio.*
+import zio.json.*
+
+// TODO: improve error reporting on generic repositories
+// This is good just for prototypes
+class JsStorageRepository[Value: JsonCodec](storage: Storage)
+    extends Repository[String, Value]:
+
+  override def find(id: String): UIO[Option[Value]] = {
+    for
+      raw <- ZIO.attemptBlocking(Option(storage.getItem(id)))
+      data <- ZIO.foreach(raw) { r =>
+        ZIO
+          .fromEither(r.fromJson[Value])
+          .mapError(_ => new RuntimeException(s"Failed to parse: ${raw}"))
+      }
+    yield data
+  }.orDie
+
+  override def save(key: String, value: Value): UIO[Unit] =
+    ZIO.attemptBlocking(storage.setItem(key, value.toJson)).orDie
diff --git a/core/shared/src/main/scala/works/iterative/core/Codecs.scala b/core/shared/src/main/scala/works/iterative/core/Codecs.scala
new file mode 100644
index 0000000..00b64a8
--- /dev/null
+++ b/core/shared/src/main/scala/works/iterative/core/Codecs.scala
@@ -0,0 +1,16 @@
+package works.iterative.core
+
+import zio.json.*
+
+trait Codecs:
+  given JsonCodec[Email] =
+    JsonCodec.string.transformOrFail(
+      Email(_).toEitherWith(_ => "Error parsing email"),
+      _.value
+    )
+  given JsonCodec[PlainMultiLine] = JsonCodec.string.transformOrFail(
+    PlainMultiLine(_).toEitherWith(_ => "Error parsing PlainMultiLine"),
+    _.asString
+  )
+
+object Codecs extends Codecs