Here we go.
Feel free to propose any changes to the code. (I added included some other json items to)
index.js:
var express = require('express');
var router = express.Router();
var vd = require("../videodata.json");

/* GET home page. */
router.get('/', function (req, res, next) {
res.render('index', {title: 'Express', videodata: vd, categoryUrl: "https://thenewboston.com/videos_food.php?cat="});
});

module.exports = router;

index.ejs

<!DOCTYPE html>
<html>
<head>
<title><%= title %></title>
<link rel='stylesheet' href='/stylesheets/style.css'/>
</head>
<body>
<% include templates/navbar.ejs %>
<h1><%= title %></h1>

<h3><%= videodata.categoryName %></h3>

<p>Bucky is awesome</p>

<ul>
<% videodata.categories.forEach(function (item) { %>
<li>
Category: <%= item.categoryName %><br>
<a href="<%= categoryUrl %> <%= item.categoryID %>">
<%= item.categoryDescription %></a>
</li>
<% }); %>
</ul>

</body>
</html>