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Web3.js es la librería JavaScript que conecta aplicaciones front‑end con la Ethereum Virtual Machine (EVM). Permite firmar transacciones, leer contratos y suscribirse a eventos desde navegadores o back‑ends Node.js, habilitando experiencias descentralizadas para millones de usuarios.
¿Por qué Web3.js?
Compatibilidad amplia
Funciona con MetaMask, WalletConnect y back‑end Node.
API intuitiva
ABI JSON & llamadas promisificadas.
Provider agnóstico
HTTP, WebSocket, IPC, Infura o Alchemy.
Eventos en tiempo real
Suscripciones a logs y filtros de bloques.
Módulos Web3.js
web3.eth
Transacciones, cuentas y contratos.
web3.utils
Conversión de unidades, hashing y firma.
web3.shh & web3.bzz
Mensajería y Swarm (experimental).
Ejemplo rápido
import Web3 from "web3";
const web3 = new Web3(window.ethereum);
const contract = new web3.eth.Contract(abi, contractAddress);
const accounts = await web3.eth.requestAccounts();
await contract.methods.mint(1).send({ from: accounts[0] });
En solo 5 líneas interactúas con un contrato NFT desde el navegador.
Casos de uso
Conectar wallets y firmar TX
DApps DeFi y NFT marketplaces
Dashboards on‑chain analytics
Notificaciones eventos en vivo
¿Por qué Itrion con Web3.js?
SDK propio para wallets y gas fee estimations
Auditoría front‑smart‑contract integrada
Optimización UX / gas en transacciones
Integración serverless (AWS Lambda)
Experiencia de Itrion
250k+
Usuarios conectados vía Web3.js
180+
DApps desplegadas
6 años
Construyendo interfaces Web3
Buenas prácticas
- • Maneja
chainChangedyaccountsChangedpara UX fluida. - • Valida ABI y direcciones en tiempo de build.
- • Usa WebSocket provider para eventos, HTTP para llamadas simples.
- • Implementa gas spikes retry back‑off.
- • Desconecta provider en componentWillUnmount para evitar memory leaks.
Web3.js is the JavaScript library that connects front‑end applications to the Ethereum Virtual Machine (EVM). It allows signing transactions, reading contracts, and subscribing to events from browsers or Node.js backends, enabling decentralized experiences for millions of users.
Why Web3.js?
Broad compatibility
Works with MetaMask, WalletConnect, and Node backends.
Intuitive API
JSON ABI & promisified calls.
Provider agnostic
HTTP, WebSocket, IPC, Infura or Alchemy.
Real-time events
Subscriptions to logs and block filters.
Web3.js modules
web3.eth
Transactions, accounts and contracts.
web3.utils
Unit conversion, hashing and signing.
web3.shh & web3.bzz
Messaging and Swarm (experimental).
Quick example
import Web3 from "web3";
const web3 = new Web3(window.ethereum);
const contract = new web3.eth.Contract(abi, contractAddress);
const accounts = await web3.eth.requestAccounts();
await contract.methods.mint(1).send({ from: accounts[0] });
In just 5 lines, you interact with an NFT contract from the browser.
Use cases
Connect wallets and sign TX
DeFi dApps & NFT marketplaces
On-chain analytics dashboards
Live event notifications
Why Itrion with Web3.js?
Proprietary SDK for wallets and gas fee estimations
Integrated front‑smart‑contract audit
UX/gas optimization in transactions
Serverless integration (AWS Lambda)
Itrion experience
250k+
Users connected via Web3.js
180+
Deployed dApps
6 years
Building Web3 interfaces
Best practices
- • Handle
chainChangedandaccountsChangedfor smooth UX. - • Validate ABI and addresses at build time.
- • Use WebSocket provider for events, HTTP for simple calls.
- • Implement gas spikes retry back‑off.
- • Disconnect provider on componentWillUnmount to avoid memory leaks.
Web3.js es la librería JavaScript que conecta aplicaciones front‑end con la Ethereum Virtual Machine (EVM). Permite firmar transacciones, leer contratos y suscribirse a eventos desde navegadores o back‑ends Node.js, habilitando experiencias descentralizadas para millones de usuarios.
¿Por qué Web3.js?
Compatibilidad amplia
Funciona con MetaMask, WalletConnect y back‑end Node.
API intuitiva
ABI JSON & llamadas promisificadas.
Provider agnóstico
HTTP, WebSocket, IPC, Infura o Alchemy.
Eventos en tiempo real
Suscripciones a logs y filtros de bloques.
Módulos Web3.js
web3.eth
Transacciones, cuentas y contratos.
web3.utils
Conversión de unidades, hashing y firma.
web3.shh & web3.bzz
Mensajería y Swarm (experimental).
Ejemplo rápido
import Web3 from "web3";
const web3 = new Web3(window.ethereum);
const contract = new web3.eth.Contract(abi, contractAddress);
const accounts = await web3.eth.requestAccounts();
await contract.methods.mint(1).send({ from: accounts[0] });
En solo 5 líneas interactúas con un contrato NFT desde el navegador.
Casos de uso
Conectar wallets y firmar TX
DApps DeFi y NFT marketplaces
Dashboards on‑chain analytics
Notificaciones eventos en vivo
¿Por qué Itrion con Web3.js?
SDK propio para wallets y gas fee estimations
Auditoría front‑smart‑contract integrada
Optimización UX / gas en transacciones
Integración serverless (AWS Lambda)
Experiencia de Itrion
250k+
Usuarios conectados vía Web3.js
180+
DApps desplegadas
6 años
Construyendo interfaces Web3
Buenas prácticas
- • Maneja
chainChangedyaccountsChangedpara UX fluida. - • Valida ABI y direcciones en tiempo de build.
- • Usa WebSocket provider para eventos, HTTP para llamadas simples.
- • Implementa gas spikes retry back‑off.
- • Desconecta provider en componentWillUnmount para evitar memory leaks.
Web3.js is the JavaScript library that connects front‑end applications to the Ethereum Virtual Machine (EVM). It allows signing transactions, reading contracts, and subscribing to events from browsers or Node.js backends, enabling decentralized experiences for millions of users.
Why Web3.js?
Broad compatibility
Works with MetaMask, WalletConnect, and Node backends.
Intuitive API
JSON ABI & promisified calls.
Provider agnostic
HTTP, WebSocket, IPC, Infura or Alchemy.
Real-time events
Subscriptions to logs and block filters.
Web3.js modules
web3.eth
Transactions, accounts and contracts.
web3.utils
Unit conversion, hashing and signing.
web3.shh & web3.bzz
Messaging and Swarm (experimental).
Quick example
import Web3 from "web3";
const web3 = new Web3(window.ethereum);
const contract = new web3.eth.Contract(abi, contractAddress);
const accounts = await web3.eth.requestAccounts();
await contract.methods.mint(1).send({ from: accounts[0] });
In just 5 lines, you interact with an NFT contract from the browser.
Use cases
Connect wallets and sign TX
DeFi dApps & NFT marketplaces
On-chain analytics dashboards
Live event notifications
Why Itrion with Web3.js?
Proprietary SDK for wallets and gas fee estimations
Integrated front‑smart‑contract audit
UX/gas optimization in transactions
Serverless integration (AWS Lambda)
Itrion experience
250k+
Users connected via Web3.js
180+
Deployed dApps
6 years
Building Web3 interfaces
Best practices
- • Handle
chainChangedandaccountsChangedfor smooth UX. - • Validate ABI and addresses at build time.
- • Use WebSocket provider for events, HTTP for simple calls.
- • Implement gas spikes retry back‑off.
- • Disconnect provider on componentWillUnmount to avoid memory leaks.
At Itrion, we provide direct, professional communication aligned with the objectives of each organisation. We diligently address all requests for information, evaluation, or collaboration that we receive, analysing each case with the seriousness it deserves.
If you wish to present us with a project, evaluate a potential solution, or simply gain a qualified insight into a technological or business challenge, we will be delighted to assist you. Your enquiry will be handled with the utmost care by our team.
At Itrion, we provide direct, professional communication aligned with the objectives of each organisation. We diligently address all requests for information, evaluation, or collaboration that we receive, analysing each case with the seriousness it deserves.
If you wish to present us with a project, evaluate a potential solution, or simply gain a qualified insight into a technological or business challenge, we will be delighted to assist you. Your enquiry will be handled with the utmost care by our team.