Core Features

Welcome to the Essential Eth library! Designed for both seasoned developers and those new to the Ethereum blockchain, Essential Eth provides easy-to-use functions for all your development needs. In the following section, we've outlined some of the most popular features of the library along with simple examples to get you started:

Utils 🔧

The Utils module is your go-to for common Ethereum needs. Whether you're converting between Ether and Wei or validating Ethereum addresses, Utils has you covered. Check out these examples:

etherToWei and weiToEther 💸

These functions allow you to easily convert between the two standard units of ether: Ether and Wei. Much like dollars and cents, Ether is often used for high-level transactions, while Wei is the smallest possible unit of the currency, ideal for precision.

import { etherToWei, weiToEther } from 'essential-eth';

            weiToEther(1000000000000000000).toNumber();
            // returns: 1

            etherToWei('1000').toString();
            // returns: '1000000000000000000000'
          

isAddress ✅

The 'isAddress' function validates Ethereum addresses. It checks whether the input string meets the formatting rules for a valid Ethereum address, which is essential for preventing errors during transactions.

import { isAddress } from 'essential-eth';

            isAddress('0xc0deaf6bd3f0c6574a6a625ef2f22f62a5150eab');
            // returns: true

            isAddress('bad');
            // returns: false
          

toChecksumAddress 🔑

The 'toChecksumAddress' function converts an Ethereum address to a checksum address. Checksum addresses include a mix of capital and lowercase letters, which can help prevent errors due to typos and incorrect input.

import { toChecksumAddress } from 'essential-eth';

            toChecksumAddress('0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359');
            // returns: '0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359'
          

Providers 🌐

A provider is a connection to an Ethereum node that allows you to communicate with the network. It serves as an interface between your application and the blockchain. Providers handle the underlying protocol and provide methods to interact with the Ethereum network, such as sending transactions, retrieving account balances, and querying contract data.

JsonRpcProvider 📡

The JsonRpcProvider module provides a straightforward way to interact with Ethereum nodes. Whether you're querying account balances or performing other operations, JsonRpcProvider simplifies the process. Here's an example of how to use it:

import { JsonRpcProvider } from 'essential-eth';

            const provider = new JsonRpcProvider();
            await provider
            .getBalance('0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8')
            .then((balance) => console.log(balance.toString()));
            // returns: "28798127851528138"
          

FallthroughProvider 🔄

The FallthroughProvider is designed for reliability. If one Ethereum node fails to respond, it automatically switches to the next provided URL. This guarantees that your application remains functional, even if individual nodes become unresponsive. Here's an example:

import { FallthroughProvider } from 'essential-eth';

            // The FallthroughProvider handles falling through to the next valid URL.
            // It's dynamic to never trust one URL again when it fails * until it has tried all other provided URLs
            // The default timeout for a request is 8 seconds after which it moves to the next URL
            const provider = new FallthroughProvider([
            'https://bad.com',
            'https://free-eth-node.com/api/eth',
            ]);
            provider.getGasPrice().toNumber();
            // returns: 39695942769