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I am getting error "TypeError: Cannot read property '_id' of undefined" on a simple post request to save a document to the collection called books , My payload looks like this:

And I am just doing db.books.save() in my route in express. Since I am not passing the id, this should ideally work, but not in this case.

Below is the full error dump I am getting on my node server:

C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\mongodb\lib\mongodb\mongo_client.js:411
          throw err
TypeError: Cannot read property '_id' of undefined
    at Collection.save (C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\mongodb\lib\mongodb\collection.js:393:15)
    at C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\index.js:203:65
    at apply (C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\thunky\index.js:16:28)
    at C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\thunky\index.js:20:25
    at Db.collection (C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\mongodb\lib\mongodb\db.js:488:44)
    at C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\index.js:268:7  
    at apply (C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\thunky\index.js:16:28)
    at C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\thunky\index.js:20:25
    at C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\index.js:300:4
    at C:\NodeProjects\ExpressTutorial\Library\node_modules\mongojs\node_modules\mongodb\lib\mongodb\mongo_client.js:408:11
31 Aug 00:14:30 - [nodemon] app crashed - waiting for file changes before starting...
                Because you need to use body-parsing middleware to populate req.body. Otherwise you wont be able to parse the response.
– Gideon Rosenthal
                Jun 30, 2016 at 18:33
                The body-parser constructor was deprecated with Express 4. Source: stackoverflow.com/questions/24330014/…
– Gideon Rosenthal
                Jun 30, 2016 at 18:34
                This is the best comment, cuz now in Express version 4.16+ they have included their own version of body-parser, so we don't need install body-parser
– AllisLove
                Jan 14 at 2:31
        
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