diff --git a/packages/massa-web3/src/experimental/basicElements/serializers/arrays.ts b/packages/massa-web3/src/experimental/basicElements/serializers/arrays.ts
index 1c629706..77f7f3d3 100644
--- a/packages/massa-web3/src/experimental/basicElements/serializers/arrays.ts
+++ b/packages/massa-web3/src/experimental/basicElements/serializers/arrays.ts
@@ -197,15 +197,14 @@ export function bytesToArray<T>(source: Uint8Array, type: ArrayTypes): T[] {
   const result: T[] = []
   let elementSize: number
 
-  if (type !== ArrayTypes.STRING) {
+  if (type === ArrayTypes.STRING) {
+    elementSize = bytesToU32(source, byteOffset)
+    byteOffset += BYTES_32_OFFSET
+  } else {
     elementSize = getDatatypeSize(type)
   }
 
   while (byteOffset < sourceLength) {
-    if (type === ArrayTypes.STRING) {
-      elementSize = bytesToU32(source, byteOffset)
-      byteOffset += BYTES_32_OFFSET
-    }
     const elt = source.slice(byteOffset, byteOffset + elementSize)
     byteOffset += elementSize
 
diff --git a/packages/massa-web3/src/experimental/crypto/cross-browser.ts b/packages/massa-web3/src/experimental/crypto/cross-browser.ts
index 5053385c..c23279cb 100644
--- a/packages/massa-web3/src/experimental/crypto/cross-browser.ts
+++ b/packages/massa-web3/src/experimental/crypto/cross-browser.ts
@@ -77,7 +77,10 @@ async function pbkdf2Browser(
     ['encrypt', 'decrypt']
   )
 
-  return Buffer.from(crypto.subtle.exportKey('raw', derivedKey))
+  const exportedKey = await crypto.subtle.exportKey('raw', derivedKey)
+  const buffer = Buffer.from(exportedKey)
+
+  return buffer
 }
 
 export type PBKDF2Options = {
diff --git a/packages/massa-web3/tsconfig.json b/packages/massa-web3/tsconfig.json
index 0acccb47..54ee5901 100644
--- a/packages/massa-web3/tsconfig.json
+++ b/packages/massa-web3/tsconfig.json
@@ -4,10 +4,11 @@
         "outDir": "./dist"
     },
     "include": [
-        "./src/**/*.ts"
+        "./src/experimental/**/*.ts"
     ],
     "exclude": [
         "node_modules",
         "**/*.spec.ts"
+        
     ]
 }
\ No newline at end of file
diff --git a/packages/web3-utils/src/serializers/arrays.ts b/packages/web3-utils/src/serializers/arrays.ts
index ee45b875..923d35ca 100644
--- a/packages/web3-utils/src/serializers/arrays.ts
+++ b/packages/web3-utils/src/serializers/arrays.ts
@@ -184,15 +184,14 @@ export function bytesToArray<T>(source: Uint8Array, type: ArrayTypes): T[] {
   const result: T[] = []
   let eltSize: number
 
-  if (type !== ArrayTypes.STRING) {
+  if (type === ArrayTypes.STRING) {
+    eltSize = bytesToU32(source, byteOffset)
+    byteOffset += 4
+  } else {
     eltSize = getDatatypeSize(type)
   }
 
   while (byteOffset < sourceLength) {
-    if (type === ArrayTypes.STRING) {
-      eltSize = bytesToU32(source, byteOffset)
-      byteOffset += 4
-    }
     const elt = source.slice(byteOffset, byteOffset + eltSize)
     byteOffset += eltSize