Building a blog website using JavaScript can be done by using Node.js and a JavaScript-based framework for the frontend, such as React or Angular. Here are the general steps:

1. Choose a domain name and a hosting provider: You will need a domain name and a hosting provider to make your website available on the internet.
2. Set up Node.js: Node.js is a JavaScript runtime that allows you to run JavaScript code outside of a web browser. Install Node.js on your computer or server.
3. Choose a backend framework: There are many Node.js frameworks available, such as Express and Koa, that can help you build your blog’s backend.
4. Set up your backend: Use your chosen backend framework to set up your blog’s backend. This will involve defining routes for your website’s API, defining models and schemas for your data, and connecting to a database.
5. Choose a frontend framework: Choose a JavaScript-based frontend framework, such as React or Angular, to build the user interface for your blog.
6. Set up your frontend: Use your chosen frontend framework to build the user interface for your blog. This will involve defining components, styling your website, and connecting to your backend API.
7. Create your blog posts: With your website set up, you can start creating your blog posts. Use your backend API to store and retrieve your blog post data.
8. Publish your blog posts: Once your blog post is ready, publish it on your website for your readers to see.
9. Promote your blog: Finally, promote your blog to attract readers. Share your blog posts on social media, join blogging communities, and use SEO techniques to rank your blog in search engines.

Building a blog website using JavaScript can be challenging, but with the right tools and frameworks, you can create a fast, responsive, and scalable platform for your blog.