diff --git a/api/src/controllers/internal/Execution.ts b/api/src/controllers/internal/Execution.ts
index b246a20..50620c1 100644
--- a/api/src/controllers/internal/Execution.ts
+++ b/api/src/controllers/internal/Execution.ts
@@ -14,6 +14,7 @@ import { PreProgramVars, Session, TreeNode } from '../../types'
 import {
   extractHeaders,
   generateFileUploadSasCode,
+  generateFileUploadJSCode,
   getFilesFolder,
   getMacrosFolder,
   HTTPHeaders,
@@ -116,8 +117,10 @@ export class ExecutionController {
         program,
         preProgramVariables,
         vars,
+        session,
         weboutPath,
-        tokenFile
+        tokenFile,
+        otherArgs
       )
 
       const codePath = path.join(session.path, 'code.js')
@@ -280,8 +283,10 @@ ${program}`
     program: string,
     preProgramVariables: PreProgramVars,
     vars: ExecutionVars,
+    session: Session,
     weboutPath: string,
-    tokenFile: string
+    tokenFile: string,
+    otherArgs?: any
   ) {
     const varStatments = Object.keys(vars).reduce(
       (computed: string, key: string) =>
@@ -300,10 +305,9 @@ const _metauser = _sasjs_username;
 const sasjsprocessmode = 'Stored Program';
 `
 
-    program = `
-/*require module for writing webout file*/
-const fs = require('fs-extra')
+    const requiredModules = `const fs = require('fs-extra')`
 
+    program = `
 /* runtime vars */
 ${varStatments}
 
@@ -316,21 +320,19 @@ ${program}
 /* write webout file*/
 fs.promises.writeFile(weboutPath, _webout)
 `
-
-    // todo: modify this commented block for js runtime
     // if no files are uploaded filesNamesMap will be undefined
-    // if (otherArgs?.filesNamesMap) {
-    //   const uploadSasCode = await generateFileUploadSasCode(
-    //     otherArgs.filesNamesMap,
-    //     session.path
-    //   )
+    if (otherArgs?.filesNamesMap) {
+      const uploadJSCode = await generateFileUploadJSCode(
+        otherArgs.filesNamesMap,
+        session.path
+      )
 
-    //   //If sas code for the file is generated it will be appended to the top of sasCode
-    //   if (uploadSasCode.length > 0) {
-    //     program = `${uploadSasCode}` + program
-    //   }
-    // }
-    return program
+      //If js code for the file is generated it will be appended to the top of jsCode
+      if (uploadJSCode.length > 0) {
+        program = `${uploadJSCode}\n` + program
+      }
+    }
+    return requiredModules + program
   }
 
   buildDirectoryTree() {
diff --git a/api/src/utils/upload.ts b/api/src/utils/upload.ts
index 640464c..cc9a47f 100644
--- a/api/src/utils/upload.ts
+++ b/api/src/utils/upload.ts
@@ -1,5 +1,6 @@
+import path from 'path'
 import { MulterFile } from '../types/Upload'
-import { listFilesInFolder } from '@sasjs/utils'
+import { listFilesInFolder, readFileBinary } from '@sasjs/utils'
 
 interface FilenameMapSingle {
   fieldName: string
@@ -98,3 +99,34 @@ export const generateFileUploadSasCode = async (
 
   return uploadSasCode
 }
+
+/**
+ * Generates the js code that references uploaded files in the concurrent request
+ * @param filesNamesMap object that maps hashed file names and original file names
+ * @param sessionFolder name of the folder that is created for the purpose of files in concurrent request
+ * @returns generated js code
+ */
+export const generateFileUploadJSCode = async (
+  filesNamesMap: FilenamesMap,
+  sessionFolder: string
+) => {
+  let uploadCode = ''
+  let fileCount = 0
+
+  const sessionFolderList: string[] = await listFilesInFolder(sessionFolder)
+  sessionFolderList.forEach(async (fileName) => {
+    if (fileName.includes('req_file')) {
+      fileCount++
+      const filePath = path.join(sessionFolder, fileName)
+      uploadCode += `\nconst _WEBIN_FILEREF${fileCount} = fs.readFileSync('${filePath}')`
+      uploadCode += `\nconst _WEBIN_FILENAME${fileCount} = '${filesNamesMap[fileName].originalName}'`
+      uploadCode += `\nconst _WEBIN_NAME${fileCount} = '${filesNamesMap[fileName].fieldName}'`
+    }
+  })
+
+  if (fileCount) {
+    uploadCode = `\nconst _WEBIN_FILE_COUNT = ${fileCount}` + uploadCode
+  }
+
+  return uploadCode
+}