Ethereum Developer Web3.js, Ethers.js and Ethereum APIs

Question 1

What is the primary purpose of the ethers.js library in Ethereum development?

Accepted Answer

To interact with the Ethereum blockchain from JavaScript/TypeScript applications

Answer

Ethers.js is a lightweight JavaScript library for connecting to Ethereum nodes, signing transactions, and interacting with smart contracts.

Question 2

What is a Provider in the context of ethers.js?

Accepted Answer

A read-only connection to an Ethereum node for querying blockchain data

Answer

A Provider in ethers.js represents a connection to the Ethereum network, enabling read-only queries like fetching balances and blocks.

Question 3

What is a Signer in ethers.js?

Accepted Answer

An abstraction that holds a private key and can sign and send transactions

Answer

A Signer in ethers.js is an abstraction over a private key, enabling signing messages and sending transactions to the Ethereum network.

Question 4

What does ABI stand for in Ethereum development?

Accepted Answer

Application Binary Interface

Answer

The ABI (Application Binary Interface) defines how to encode and decode function calls and return values when interacting with a smart contract.

Question 5

Which JSON-RPC method is used to get the ETH balance of an address on Ethereum?

Accepted Answer

eth_getBalance

Answer

`eth_getBalance` returns the Wei balance of a given address at a specified block number.

Ethereum Developer Practice Test