Comment by Sarthak Verma on "Building a Simple JavaScript Blockchain" | Hashnode

Sarthak Verma

code, design and crypto

Sep 1, 2021

Great article, but how are you able to use the SHA256 function without importing it into blockchain.js?

By doing as you instructed, I am getting this error in the console.

blockchain.js:6 Uncaught ReferenceError: SHA256 is not defined
    at new Block (blockchain.js:6)
    at new Blockchain (blockchain.js:24)
    at <anonymous>:1:18

Andrew Bruner

Front-end Web and JavaScript Developer

Sep 27, 2021

Hi Sarthak Verma, Thanks for following along! So I have included the sha256.js file in a script tag in the body of the html file, and then the blockchain.js file (in that order).

The blockchain.js functions can then access everything from the preceding file as they are both imported into index.html.

I hope that clears things up. Good luck on your cryptojourney!

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