Caver-js: A Beginner’s Guide to Klaytn’s JavaScript API

In the ever-evolving world of blockchain technology, Kaia Blockchain has paved the way for several open-source projects, leading to the transition from the old repository to new avenues like kaiacaver-js. If you are eager to explore this shift and learn how to effectively use caver-js, you’ve come to the right place!

Requirements

Before diving in, ensure you have the following prerequisites:

• Node.js
• npm
• gcc-c++
• mocha (for testing)

Installation

Getting caver-js up and running is straightforward. Follow these steps:

Node Installation

To install caver-js via npm, run the following command:

$ npm install caver-js

If you need a specific version, use:

$ npm install caver-js@X.X.X

Browser Installation

To use caver-js in a browser, you can either build it from the repository or include it via CDN. For CDN, include this script in your HTML:

<script src="https://cdnjs.cloudflare.com/ajax/libs/caver-js/x.x.x/caver.min.js"></script>

Getting Started

Let’s connect to your Klaytn node and start interacting!

Connecting to your node

Run the following code in your terminal to connect to a local Klaytn endpoint:

const Caver = require('caver-js');
const caver = new Caver('http://localhost:8551');

Check the Connection

To ensure that your setup works, you can check the connection by executing:

caver.rpc.klay.getClientVersion().then(console.log);

Using caver-js keyring wallet

By harnessing the caver wallet, you can manage multiple keyrings. Here’s how to generate a random keyring:

const keyring = caver.wallet.keyring.generate();

The above code is akin to crafting a new key for your house. Each time you generate a new keyring, it opens up a myriad of possibilities, from signing transactions to managing funds.

Submitting a Transaction

That’s right! You can send value across the Klaytn network easily. Refer to the following code to submit a transaction:

const vt = caver.transaction.valueTransfer.create({
  from: keyring.address,
  to: '0xRecipientAddress',
  value: caver.utils.convertToPeb(1, 'KLAY'),
  gas: 25000,
});
caver.wallet.sign(keyring.address, vt).then(signed => {
  caver.rpc.klay.sendRawTransaction(signed).then(console.log);
});

Troubleshooting

If you encounter issues, consider the following solutions:

• If using the Kaikas Web Extension Wallet, ensure compatibility with functions prior to common architecture.
• Running Webpack 5? Make sure you’ve included necessary polyfills, as they are not provided by default. You can add them in your webpack.config.js.
• Remember, Kaikas may process only one transaction at a time; refreshing the pending transaction could resolve delays.
• For more insights, updates, or to collaborate on AI development projects, stay connected with fxis.ai.

Conclusion

At fxis.ai, we believe that such advancements are crucial for the future of AI, as they enable more comprehensive and effective solutions. Our team is continually exploring new methodologies to push the envelope in artificial intelligence, ensuring that our clients benefit from the latest technological innovations.

Now that you have a grasp on caver-js, it’s time to explore the world of blockchain interactions and unleash the true potential of decentralized applications!