send data from server to client nodejs

I have this code that allows me to get all the posts that the user made in my DB. The problem is that I tried to send that data to the front end (client). But I didn't succeed and I don't know what I'm missing,

The code that extracts the user's info from mongoDB is below. Tthe code is working perfectly, no issue with it,

User.find({}).lean(true).exec((err, users) => {
      let userMap = [];

            userMap.push({ user: users[i], posts: users[i].posts[j] });
       //all the data are stored to userMAP :[{user : xxxxx ,posts : {the posts are here}}]
          }
        }

      }
      console.log(userMap);

      User.findOne({ userName: req.user.userName }, (error, req_user) => {

        console.log(req.user.lastLogin)
        let lastSeen = ta.ago(req.user.lastLogin);

        //console.log(posts)
        res.render('home', { // this part for rendering the homePage and send data
          user: req_user,
          people: users,
          userMap: userMap.reverse()
        });
      });

What I tried in my client side code is this:

  <div class="container">

        <% for(var x=0;x<user.posts.length;x++) { %>
    <div class="jumbotron">
        <div>by
            <b>{{ user.posts[x].author }}</b>
            on
            <small>{{ user.posts[x].createdAt }}</small>
        </div>

        <div>
            <p>{{ user.posts[x].caption }}</p>
        </div>

        <div class="row">
            <button onclick="actOnPost(event);"
                    data-post-id="{{ this.id }}">Like
            </button>
            <span id="likes-count-{{ this.id }}">{{ this.likes_count }}</span>
        </div>
    </div>
    <% } %>

For the error part I don't get anything,

this is the image of my stored data in the database

and this is the image of the homepage

The scenario for my code :

1- I'm using a EJS view engine and when the user login in the home.ejs is showing up and in the server side I use the code above to prepare the data that I need to display

2- Everything works perfectly except for displaying the data on the client side home.ejs

3- to call that page from my server I used this statement with the mix of the above code

router.get('/home', (req, res) => {
  if (req.user.id) {
    console.log(req.user.id)
    User.find({}).lean(true).exec((err, users) => {
      let userMap = [];

Any help or a better solution for showing data at the client side,

Best Regards,