diff --git a/20231110-18-48-52_report.csv b/20231110-18-48-52_report.csv
deleted file mode 100644
index 0e41fe6b1..000000000
Binary files a/20231110-18-48-52_report.csv and /dev/null differ
diff --git a/springWarehouse/pom.xml b/springWarehouse/pom.xml
index eb24a046d..e980f8aeb 100644
--- a/springWarehouse/pom.xml
+++ b/springWarehouse/pom.xml
@@ -186,6 +186,13 @@
 			<version>2.9.2</version>
 		</dependency>
 
+		<!-- json file IO -->
+		<dependency>
+			<groupId>com.googlecode.json-simple</groupId>
+			<artifactId>json-simple</artifactId>
+			<version>1.1.1</version>
+		</dependency>
+
     </dependencies>
 
 	<build>
diff --git a/springWarehouse/sql/ddl/download_status.sql b/springWarehouse/sql/ddl/download_status.sql
index 7c69f2b76..67d77e5c8 100644
--- a/springWarehouse/sql/ddl/download_status.sql
+++ b/springWarehouse/sql/ddl/download_status.sql
@@ -13,6 +13,6 @@ CREATE TABLE IF NOT EXISTS download_status(
 
 INSERT INTO download_status(download_url, status, create_time)
 VALUES
-("test.json", "pending", now()),
-("test.json", "failed", now()),
-("test.json", "completed", now());
\ No newline at end of file
+("20231112-17-15-24_report.json", "pending", now()),
+("20231112-17-15-24_report.json", "failed", now()),
+("20231112-17-15-24_report.json", "completed", now());
\ No newline at end of file
diff --git a/springWarehouse/src/main/java/com/yen/springWarehouse/controller/DownloadController.java b/springWarehouse/src/main/java/com/yen/springWarehouse/controller/DownloadController.java
index 0012e1ddf..4eeca69f2 100644
--- a/springWarehouse/src/main/java/com/yen/springWarehouse/controller/DownloadController.java
+++ b/springWarehouse/src/main/java/com/yen/springWarehouse/controller/DownloadController.java
@@ -5,6 +5,7 @@
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.yen.springWarehouse.bean.DownloadStatus;
+import com.yen.springWarehouse.mapper.DownloadStatusMapper;
 import com.yen.springWarehouse.service.DownloadStatusService;
 import com.yen.springWarehouse.util.DateTimeUtils;
 import com.yen.springWarehouse.util.FileUtil;
@@ -19,8 +20,11 @@
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 
+import java.io.File;
 import java.io.IOException;
 import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 @Slf4j
@@ -31,6 +35,12 @@ public class DownloadController {
     @Autowired
     DownloadStatusService downloadStatusService;
 
+    @Autowired
+    DownloadStatusMapper downloadStatusMapper;
+
+    String userDirectory = new File("").getAbsolutePath();
+    final String prefix = userDirectory + "/src/main/resources/report/";
+
     @GetMapping("/list")
     public String list(Map<String, Object> map, @RequestParam(value="pageNo", required=false, defaultValue="1") String pageNoStr) {
 
@@ -53,38 +63,49 @@ public String list(Map<String, Object> map, @RequestParam(value="pageNo", requir
         return "download/list_download";
     }
 
-    @GetMapping("/create")
-    public String createDownload(){
+    @GetMapping("/create_report")
+    public String createDownload() {
 
         DateTimeUtils dateTimeUtils = new DateTimeUtils();
         String timestamp = dateTimeUtils.getCurrentDateYYYYMMDDHHMMSS();
-
         FileUtil fileUtil = new FileUtil();
 
-        final String prefix = "/Users/yennanliu/SpringPlayground/";
-        String fileName = "/" + timestamp + "_report.csv";
-        DownloadStatus downloadStatus = new DownloadStatus();
-        downloadStatus.setStatus("completed");
-        downloadStatus.setDownloadUrl(fileName);
-        downloadStatus.setCreateTime(new Date());
+        // create report
+        String fileName = timestamp + "_report.json";
+        Map<String, Object> map = new HashMap<>();
+        map.put("name", "king");
+        map.put("age", 17);
         // save file to local // TODO : save it to remote file system (e.g. S3)
-        if (fileUtil.writeFile("some data", prefix+fileName)){
+        Boolean result = fileUtil.writeJsonFile(map, prefix + fileName);
+        if (result) {
+            DownloadStatus downloadStatus = new DownloadStatus();
+            downloadStatus.setStatus("completed");
+            downloadStatus.setDownloadUrl(fileName);
+            downloadStatus.setCreateTime(new Date());
             log.info("save File OK");
             // save to DB
             downloadStatusService.save(downloadStatus);
-        }else {
+        } else {
             log.info("save File failed");
         }
         return "download/success";
     }
 
+    // TODO : fix : make GET request with report id
     @GetMapping("/download_report")
     public ResponseEntity<Resource> downloadFile() throws IOException {
 
         // Load the file from the classpath (assuming it's in the resources/static directory)
-        Resource resource = new ClassPathResource("/test.json");
+//        Resource resource = new ClassPathResource("/test.json");
+//        HttpHeaders headers = new HttpHeaders();
+//        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=test.json");
+
+        List<DownloadStatus> downloadStatusList = downloadStatusMapper.getAllDownloadStatus();
+        // TODO : fix below (currently only get 1st downloadStatus)
+        String downloadUrl = "/report/" + downloadStatusList.get(0).getDownloadUrl();
+        Resource resource = new ClassPathResource(downloadUrl);
         HttpHeaders headers = new HttpHeaders();
-        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=test.json");
+        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=%s".format("test.json"));
 
         return ResponseEntity.ok()
                 .headers(headers)
diff --git a/springWarehouse/src/main/java/com/yen/springWarehouse/util/FileUtil.java b/springWarehouse/src/main/java/com/yen/springWarehouse/util/FileUtil.java
index ec83b1896..7a0fbb0c8 100644
--- a/springWarehouse/src/main/java/com/yen/springWarehouse/util/FileUtil.java
+++ b/springWarehouse/src/main/java/com/yen/springWarehouse/util/FileUtil.java
@@ -1,10 +1,13 @@
 package com.yen.springWarehouse.util;
 
 import lombok.extern.slf4j.Slf4j;
+import org.json.simple.JSONObject;
 
 import java.io.BufferedOutputStream;
 import java.io.DataOutputStream;
 import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.util.Map;
 
 @Slf4j
 public class FileUtil {
@@ -24,4 +27,22 @@ public Boolean writeFile(String intputString, String fileName){
         }
     }
 
+    // https://www.tutorialspoint.com/how-to-write-create-a-json-file-using-java
+    public Boolean writeJsonFile(Map<String, Object> map, String fileName){
+        try{
+            JSONObject jsonObject = new JSONObject();
+            // insert map to jsonObject
+            for (String key : map.keySet()){
+                jsonObject.put(key, map.get(key));
+            }
+            FileWriter file = new FileWriter(fileName);
+            file.write(jsonObject.toJSONString());
+            file.close();
+            return true;
+        }catch (Exception e){
+            log.error("writeJsonFile error : " + e);
+            return false;
+        }
+    }
+
 }
diff --git a/springWarehouse/src/main/resources/report/20231112-17-15-24_report.json b/springWarehouse/src/main/resources/report/20231112-17-15-24_report.json
new file mode 100644
index 000000000..f847a6e1c
--- /dev/null
+++ b/springWarehouse/src/main/resources/report/20231112-17-15-24_report.json
@@ -0,0 +1 @@
+{"name":"king","age":17}
\ No newline at end of file
diff --git a/springWarehouse/src/main/resources/report/20231112-18-00-25_report.json b/springWarehouse/src/main/resources/report/20231112-18-00-25_report.json
new file mode 100644
index 000000000..f847a6e1c
--- /dev/null
+++ b/springWarehouse/src/main/resources/report/20231112-18-00-25_report.json
@@ -0,0 +1 @@
+{"name":"king","age":17}
\ No newline at end of file
diff --git a/springWarehouse/src/main/resources/report/20231112-18-03-04_report.json b/springWarehouse/src/main/resources/report/20231112-18-03-04_report.json
new file mode 100644
index 000000000..f847a6e1c
--- /dev/null
+++ b/springWarehouse/src/main/resources/report/20231112-18-03-04_report.json
@@ -0,0 +1 @@
+{"name":"king","age":17}
\ No newline at end of file
diff --git a/springWarehouse/src/main/resources/report/20231112-18-13-33_report.json b/springWarehouse/src/main/resources/report/20231112-18-13-33_report.json
new file mode 100644
index 000000000..f847a6e1c
--- /dev/null
+++ b/springWarehouse/src/main/resources/report/20231112-18-13-33_report.json
@@ -0,0 +1 @@
+{"name":"king","age":17}
\ No newline at end of file
diff --git a/springWarehouse/src/main/resources/report/20231112-18-13-35_report.json b/springWarehouse/src/main/resources/report/20231112-18-13-35_report.json
new file mode 100644
index 000000000..f847a6e1c
--- /dev/null
+++ b/springWarehouse/src/main/resources/report/20231112-18-13-35_report.json
@@ -0,0 +1 @@
+{"name":"king","age":17}
\ No newline at end of file
diff --git a/springWarehouse/src/main/resources/report/test_output_2.json b/springWarehouse/src/main/resources/report/test_output_2.json
new file mode 100644
index 000000000..f847a6e1c
--- /dev/null
+++ b/springWarehouse/src/main/resources/report/test_output_2.json
@@ -0,0 +1 @@
+{"name":"king","age":17}
\ No newline at end of file
diff --git a/springWarehouse/src/main/resources/templates/download/list_download.html b/springWarehouse/src/main/resources/templates/download/list_download.html
index f6e0ed429..0702d7b0a 100644
--- a/springWarehouse/src/main/resources/templates/download/list_download.html
+++ b/springWarehouse/src/main/resources/templates/download/list_download.html
@@ -8,8 +8,8 @@
 <body style="padding:8px;">
 <h3 class="title">Report Download</h3>
 
-<a href="/download/create">
-    <button class="create">Create Download</button>
+<a href="/download/create_report">
+    <button class="create_report">Create Download</button>
 </a>
 
 
diff --git a/springWarehouse/src/test/java/com/yen/springWarehouse/util/FileUtilTest.java b/springWarehouse/src/test/java/com/yen/springWarehouse/util/FileUtilTest.java
new file mode 100644
index 000000000..63fee645c
--- /dev/null
+++ b/springWarehouse/src/test/java/com/yen/springWarehouse/util/FileUtilTest.java
@@ -0,0 +1,46 @@
+package com.yen.springWarehouse.util;
+
+import com.yen.springWarehouse.controller.DownloadController;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class FileUtilTest {
+
+    @Test
+    public void testWriteJsonFile() throws URISyntaxException {
+
+        String userDirectory = new File("").getAbsolutePath();
+        System.out.println(">>> current path = " + userDirectory); // >>> crrent path = /Users/yennanliu/SpringPlayground/springWarehouse
+        String prefix = userDirectory + "/src/main/resources/report";
+
+        FileUtil fileUtil = new FileUtil();
+        String fileName = prefix + "/" + "test_output_2.json";
+        Map<String, Object> map = new HashMap<>();
+        map.put("name", "king");
+        map.put("age", 17);
+        Boolean result = fileUtil.writeJsonFile(map, fileName);
+        System.out.println("write json to : " + fileName);
+        System.out.println(result);
+    }
+
+    @Test
+    public void testWriteJsonFile2() throws URISyntaxException {
+
+        URL url = this.getClass().getResource("/report");
+        File parentDirectory = new File(new URI(url.toString()));
+
+        System.out.println("url = " + url);
+        System.out.println("url.getPath() = " + url.getPath());
+        System.out.println("parentDirectory = " + parentDirectory);
+
+    }
+
+}
\ No newline at end of file