eth-query

What is eth-query?

The eth-query npm package is a utility for interacting with Ethereum nodes. It provides a simple interface to make JSON-RPC calls to an Ethereum node, allowing developers to query blockchain data, send transactions, and interact with smart contracts.

What are eth-query's main functionalities?

Querying Blockchain Data

This feature allows you to query blockchain data such as blocks, transactions, and logs. The code sample demonstrates how to get the latest block using eth-query.

const EthQuery = require('eth-query');
const ethQuery = new EthQuery(provider);

ethQuery.getBlockByNumber('latest', (err, block) => {
  if (err) console.error(err);
  else console.log(block);
});

Sending Transactions

This feature allows you to send transactions to the Ethereum network. The code sample demonstrates how to send a transaction using eth-query.

const EthQuery = require('eth-query');
const ethQuery = new EthQuery(provider);

const txParams = {
  from: '0xYourAddress',
  to: '0xRecipientAddress',
  value: '0xAmountInWei',
  gas: '0xGasLimit'
};

ethQuery.sendTransaction(txParams, (err, txHash) => {
  if (err) console.error(err);
  else console.log(txHash);
});

Interacting with Smart Contracts

This feature allows you to interact with smart contracts by calling their functions. The code sample demonstrates how to call a smart contract function using eth-query.

const EthQuery = require('eth-query');
const ethQuery = new EthQuery(provider);

const contractAddress = '0xContractAddress';
const data = '0xEncodedFunctionCall';

ethQuery.call({ to: contractAddress, data: data }, (err, result) => {
  if (err) console.error(err);
  else console.log(result);
});

Other packages similar to eth-query

web3

Web3.js is a comprehensive library for interacting with the Ethereum blockchain. It provides a wide range of functionalities including querying blockchain data, sending transactions, and interacting with smart contracts. Compared to eth-query, Web3.js offers more features and a higher level of abstraction, making it suitable for more complex applications.

ethers

Ethers.js is a lightweight library for interacting with the Ethereum blockchain. It provides similar functionalities to eth-query, such as querying blockchain data, sending transactions, and interacting with smart contracts. Ethers.js is known for its simplicity and ease of use, making it a popular choice among developers.

truffle-contract

Truffle Contract is a library for interacting with Ethereum smart contracts. It provides a higher-level abstraction for working with contracts, making it easier to deploy, test, and interact with them. Compared to eth-query, Truffle Contract is more focused on smart contract development and testing.

README

like web3 but for minimalists

var provider = { sendAsync: function(params, cb){/* ... */} }
var query = new EthQuery(provider)

query.getBalance(address, cb)