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web3-core-requestmanager
Advanced tools
The web3-core-requestmanager package is a core component of the Web3.js library, which is used to interact with Ethereum blockchain nodes. It provides the functionality to send JSON-RPC requests to Ethereum nodes and handle the responses. This package is essential for managing the communication between the client application and the Ethereum network.
Sending JSON-RPC Requests
This feature allows you to send JSON-RPC requests to an Ethereum node. In this example, a request is sent to get the current block number from the Ethereum node.
const Web3 = require('web3');
const RequestManager = require('web3-core-requestmanager');
const web3 = new Web3('http://localhost:8545');
const requestManager = new RequestManager(web3.currentProvider);
const payload = {
jsonrpc: '2.0',
method: 'eth_blockNumber',
params: [],
id: 1
};
requestManager.send(payload, (error, result) => {
if (error) {
console.error('Error:', error);
} else {
console.log('Block Number:', result.result);
}
});
Batch Requests
This feature allows you to send multiple JSON-RPC requests in a single batch. In this example, two requests are sent: one to get the current block number and another to get the current gas price.
const Web3 = require('web3');
const RequestManager = require('web3-core-requestmanager');
const web3 = new Web3('http://localhost:8545');
const requestManager = new RequestManager(web3.currentProvider);
const batch = new web3.BatchRequest();
batch.add(requestManager.send({
jsonrpc: '2.0',
method: 'eth_blockNumber',
params: [],
id: 1
}, (error, result) => {
if (error) {
console.error('Error:', error);
} else {
console.log('Block Number:', result.result);
}
}));
batch.add(requestManager.send({
jsonrpc: '2.0',
method: 'eth_gasPrice',
params: [],
id: 2
}, (error, result) => {
if (error) {
console.error('Error:', error);
} else {
console.log('Gas Price:', result.result);
}
}));
batch.execute();
The ethers.js library is a complete and compact library for interacting with the Ethereum blockchain and its ecosystem. It provides similar functionalities to web3-core-requestmanager, such as sending JSON-RPC requests and managing communication with Ethereum nodes. Ethers.js is known for its simplicity and ease of use.
The web3.js library is a comprehensive library for interacting with the Ethereum blockchain. It includes the web3-core-requestmanager package as one of its core components. Web3.js provides a wide range of functionalities, including sending JSON-RPC requests, managing accounts, and interacting with smart contracts.
Ethjs is a lightweight and modular library for interacting with the Ethereum blockchain. It provides similar functionalities to web3-core-requestmanager, such as sending JSON-RPC requests and managing communication with Ethereum nodes. Ethjs is designed to be simple and efficient, making it a good choice for lightweight applications.
This is a sub package of web3.js
The requestmanager package is used by most web3.js packages. Please read the documentation for more.
npm install web3-core-requestmanager
Build running the following in the web3.js repository:
npm run-script build-all
Then include dist/web3-core-requestmanager.js
in your html file.
This will expose the Web3RequestManager
object on the window object.
// in node.js
var Web3WsProvider = require('web3-providers-ws');
var Web3RequestManager = require('web3-core-requestmanager');
var requestManager = new Web3RequestManager(new Web3WsProvider('ws://localhost:8546'));
FAQs
Web3 module to handle requests to external providers.
We found that web3-core-requestmanager demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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