import { clusterApiUrl, Connection, Keypair, LAMPORTS_PER_SOL } from '/node_modules/@solana/web3.js';

The above line throwing the below error in my browser console. I am using plain html and javascript files to run this code.

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.

That means I can't use simple html file to use any of solana blockchain end points.

May I know if Angular can be used?

2 Answers 2


the error you got back is descriptive and it means you are trying to load the package using .html file extension whilst this package can only be loaded on a javascript application or framework.

I suggest you start trying out Svelte, React and the rest.

  • Yes you can use Angular and the best way to get started would be the Solana Cookbook.. Solana CookBook Link Commented Dec 13, 2022 at 10:52
  • I have started implementaion on Angular but I am facing different issue now. I have installed Solana web3.js and just Import the web3.js at the top of my TS file. "node_modules/@solana/web3.js/lib/index.d.ts:6:30 - error TS7016: Could not find a declaration file for module 'node-fetch'. 'C:/Code/DEMO/FullStack UI/FullStack.UI/node_modules/node-fetch/lib/index.js' implicitly has an 'any' type. Try npm i --save-dev @types/node-fetch if it exists or add a new declaration (.d.ts) file containing declare module 'node-fetch'; 6 import * as nodeFetch from 'node-fetch';"
    – Rohit
    Commented Dec 16, 2022 at 14:58
  • okay so to resolve this you can run npm install node-fetch in your terminal and after doing that you can import node-fetch using import fetch from 'node-fetch'; .. this should resolve your issue...thanks Commented Dec 16, 2022 at 15:15
  • I have already tried but not succeded
    – Rohit
    Commented Dec 16, 2022 at 15:35
  • okay then why not try this npm i --save-dev @types/node-fetch then import the @solana/web3.js afterwards Commented Dec 16, 2022 at 15:39

You can import @solana/web3.js library into a plain HTML file via script tag.

<!-- Development (un-minified) -->
<script src="https://unpkg.com/@solana/web3.js@latest/lib/index.iife.js"></script>

<!-- Production (minified) -->
<script src="https://unpkg.com/@solana/web3.js@latest/lib/index.iife.min.js"></script>

To connect to devnet cluster:

const connection = new solanaWeb3.Connection(solanaWeb3.clusterApiUrl("devnet"));

Note: It is solanaWeb3 and not web3

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