Interact with Bitcoin Core RPC using JavaScript

Prerequisites

• Bitcoin Core node running with RPC enabled.
• RPC credentials (username and password).

Step 1: Set Up Your HTML File

Include the axios library in your HTML file to make HTTP requests.

<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>

Step 2: JavaScript Code

Below is the JavaScript code to interact with the Bitcoin Core RPC interface:

const rpcUser = 'yourusername';
const rpcPassword = 'yourpassword';
const rpcHost = 'http://127.0.0.1:8332';

async function callRPC(method, params = []) {
    const response = await axios.post(rpcHost, {
        jsonrpc: "1.0",
        id: "curltext",
        method: method,
        params: params
    }, {
        auth: {
            username: rpcUser,
            password: rpcPassword
        }
    });
    return response.data.result;
}

async function getBlockchainInfo() {
    try {
        const info = await callRPC('getblockchaininfo');
        document.getElementById('output').innerText = JSON.stringify(info, null, 2);
    } catch (error) {
        console.error('Error:', error);
    }
}

document.addEventListener('DOMContentLoaded', () => {
    getBlockchainInfo();
});
    

Step 3: Display Output

The output will be displayed in the output div below:

<div id="output"></div>