问题解决，CURD操作问题是Content-Type: application/json没加

handler/employee.js

@@ -15,6 +15,7 @@ const list=(req,res,next)=>{
 }
 
 const detail = (req,res,next)=>{
+    console.log(req.body)
     let employeeID=req.body.employeeID
     Employee.findById(employeeID)
     .then(response=>{
@@ -23,6 +24,7 @@ const detail = (req,res,next)=>{
         })
     })
     .catch(err=>{
+        console.log(err)
         res.json({
             message: 'An error Occured!'
         })
@@ -76,7 +78,7 @@ const update=(req,res,next)=>{
 
 const destroy=(req,res,next)=>{
     let employeeID=req.body.employeeID
-    Employee.findByIdAndDelete({"_id": ObjectId( employeeID)})
+    Employee.findByIdAndDelete( employeeID)
     .then(()=>{
         res.json({
             message: 'Employee deleted successfully.'

test.http

@@ -2,14 +2,20 @@
 
 ###
 POST {{url}}/employee/detail HTTP/1.1
+Content-Type: application/json
 
 {
-  "employeeID": "66e99aca14f420ccd5209104"
+  "employeeID": "66e99c327dcae1c68f763366"
 }
 
 ###
 GET {{url}}/employee/list HTTP/1.1
 
+###
+curl --request GET \
+  --url http://localhost:8080/api/employee/list \
+  --header 'user-agent: vscode-restclient'
+
 ###
 POST {{url}}/employee/create HTTP/1.1
 Content-Type: application/json
@@ -24,9 +30,10 @@ Content-Type: application/json
 
 ###
 POST {{url}}/employee/update HTTP/1.1
+Content-Type: application/json
 
 {
-  "employeeID": "66e98e9249b0ceb1e0208b6e",
+  "employeeID": "66e99c327dcae1c68f763366",
   "name": "kerry doe",
   "designation": "fremale",
   "email": "sdfs@s22df.com",
@@ -36,7 +43,8 @@ POST {{url}}/employee/update HTTP/1.1
 
 ### 
 POST {{url}}/employee/delete HTTP/1.1
+Content-Type: application/json
 
 {
-  "employeeID": "66e99c327dcae1c68f763366"
+  "employeeID": "66e996dfc0f1d788626a2102"
 }