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The code for this project is located here. The video course for this tutorial is located here. Also check out Building GraphQL APIs on Ethereum I recently joined Edge & Node as a Developer Relations Engineer and have been diving deeper into smart contract development with Ethereum.

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I have nodejs and npm installed I tried running the command npm install -g create-react-app but it halts at the error below freduah@freduah:~$ npm install -g create-react-app npm WARN registry Unexpected warning for http://registry.npmjs.org/: Miscellaneous Warning EAI_AGAIN: request to http://registry.npmjs.org/create-react-app failed, reason: getaddrinfo EAI_AGAIN registry.npmjs.org npm WARN registry Using stale data from http://registry.npmjs.org/ due to a request error during revalidation.

The solution that worked for me was simply to update node. For, example, using node 12.22.0 worked, as well as 14.17.4. Note that node version of 13.x will not work at all. I was also having this issue and found out that this error seems to be specific to some node js versions.

Node.js is a popular open-source, cross-platform server-side environment for building robust applications. Since a vibrant community of contributors backs it, the platform is continuously updated to introduce new features, security patches, and other performance improvements. So, updating to the latest Node.js version can help you to make the most of the technology.

Full stack developer roles are among the hottest careers in the tech space now. These talented folks can develop a whole product from scratch. A full stack developer is a combination of Front-end developer and Backend developer. These two in themselves are full time jobs and most people make careers out of one of them.

Recommended Reading We recommend that all web3 site developers read the Basic Usage section. Recent Breaking Provider Changes If you are an Ethereum application developer and are looking for information about our January 2021 provider API changes, please see our Migration Guide for more details.

Actually, I had planned another topic in Solidity Series for web3.js but then the post could go off tangent hence I am discussing the basics of web3.js and how to interact with a smart contract. I am going to use the same contract I had created here.

In order to send Ethereum from one wallet to another, we need to have the following things in line:

Ethereum Stack Exchange is a question and answer site for users of Ethereum, the decentralized application platform and smart contract enabled blockchain. It only takes a minute to sign up. Sign up to join this community Asked Here's a NodeJS script where I'm trying to send a raw transaction.

In order to send Ethereum from one wallet to another, we need to have the following things in line:

All Ethereum addresses returned by functions of this package are returned as checksum addresses. This means some letters are uppercase and some are lowercase. Based on that it will calculate a checksum for the address and prove its correctness. Incorrect checksum addresses will throw an error when passed into functions.

i am trying to send a transaction but it throws an error. still i am not sending any transaction just signing it... Error: Expected private key to be an Uint8Array with length 32 at assert (C:\web3\

I have this demo code I want to broserify: var Tx = require('ethereumjs-tx') var privateKey = new Buffer('e331b6d69882b4cb4ea581d88e0b604039a3de5967688d3dcffdd2270c0fd109', 'hex') var rawTx = { nonce: '0x00', gasPrice: '0x09184e72a000', gasLimit: '0x2710', to: '0x0000000000000000000000000000000000000000', value: '0x00', data: '0x7f7465737432000000000000000000000000000000000000000000000000000000600057' } var tx = new Tx(rawTx) tx.sign(privateKey) var serializedTx = tx.serialize() console.log(serializedTx.toString('hex')) I have installed ethereum-tx almost succesfully like this: npm install -g ethereumjs-tx ...

In order to understand this article, you need to understand how to create a smart contract, deploy it to test network and how to play with Metamask. In this article, I am going to show you how to deploy your smart contract to Rinkeby network. So what is Rinkeby network?

Infura's development suite provides instant, scalable API access to the Ethereum and IPFS networks. Connect your app to Ethereum and IPFS now, for free!

This is meant to be a bare bones introduction to web3.js. By the end of this tutorial, you will be up and running with the needed tools to interact with an Ethereum test net. I'll assume you have a basic understanding of, JavaScrit, React js and what a blockchain is.

This three part tutorial constitutes a guided walk-through of the Ethereum development ecosystem using a simple but useful example application, namely document certification. Document certification, also known as time-stamping or proof of existence, is one of the most obvious use cases for blockchain technology beyond digital currencies.

If you are facing this error and you do not want to change your main configuration, an easy fix would be to use the following approach. I am not sure if it is recommended as a good practice, though. Feel free to correct it.

class NameForm extends React.Component { constructor(props) { super(props); this.state = {value: ''}; this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); } handleChange(event) { this.setState({value: event.target.value}); } handleSubmit(event) { alert('A name was submitted: ' + this.state.value); event.preventDefault(); } render() { return ( Name: ); } }

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There are three answers here, depending on the version of React you're (forced to) work(ing) with, and whether you want to use hooks. It's important to understand how React works, so you can do things properly (protip: it's is super worth running through the React tutorial exercise on the React website.

Tip We will be building this Before you set up make sure you've visited and gone through our Getting Started Guide Make sure you have: Open the project folder. Navigate to start-> index.html, and look at the comment stating part 1. We will be using/building off of this entire section for the first part of the tutorial.

const config: Config = { readOnlyChain: ChainId.Mainnet, readOnlyUrls: { [ChainId.Mainnet]: 'https://mainnet.infura.io/v3/62687d1a985d4508b2b7a24827551934', }, } ReactDOM.render( , document.getElementById('root') ) export function App() { const { activateBrowserWallet, account } = useEthers() return ( activateBrowserWallet()}>Connect {account && Account: {account} } ) }

Today we're going to build a simple React / Web3 Dapp that replicates a small portion of the Uniswap v2 interface - specifically, we are building the "account login" button that allows users to connect to a Dapp using their MetaMask extension.

Tip We will be building this Before you set up make sure you've visited and gone through our Getting Started Guide Make sure you have: Open the project folder. Navigate to start-> index.html, and look at the comment stating part 1. We will be using/building off of this entire section for the first part of the tutorial.

Docker is a containerization tool used to speed up the development and deployment processes. If you're working with microservices, Docker makes it much easier to link together small, independent services. It also helps to eliminate environment-specific bugs since you can replicate your production environment locally.

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I've been developing with the MERN stack for over five years, so I wanted to put together a guide on why this particular platform is so beneficial when you're creating a web app instead of other...

I've wanted to do this write-up for a while now, because it's difficult to find good (FREE) material that covers the absolute basics of how you can interact with the functions within a smart contract on a webpage. Smart contracts ultimately boil down to two things.... You READ information stored on the smart contract.

Following the financial crises of 2008, Satoshi Nakamoto proposed and developed a software that was to become new digital money -Bitcoin. With Bitcoin, Satoshi Nakamoto introduced to the world a central bank of the internet, a...

react_metaMask_connection // https://docs.metamask.io/guide/ethereum-provider.html#using-the-provider $ create-react-app metamask_conn $ cd metamask_conn $ npm start $npm install --save ethers This project was bootstrapped with Create React App. In the project directory, you can run: Runs the app in the development mode. Open http://localhost:3000 to view it in the browser. The page will reload if you make edits.

Have you ever gotten that error while working on your code? Seems weird right? how does that even happen? You have just installed some modules using npm, write some code, pushed it on for a code review from your peers. Then everyone checks your code and gives it the green light to merge into master.

Today we're going to build a simple React / Web3 Dapp that replicates a small portion of the Uniswap v2 interface - specifically, we are building the "account login" button that allows users to connect to a Dapp using their MetaMask extension.

Shubham's answer explains very well. This answer is addition to it as per to avoid some pitfalls and refactoring to a more readable syntax Pitfall : There is common misconception in rendering array of objects especially if there is an update or delete action performed on data.

Today we are going to do a simple tutorial on how to connect to your MetaMask wallet in a JavaScript browser application and show the balance of your wallet and tokens.

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Bootstrap 4 Todo task list with badges snippet for your project 📌📌. this snippet is created using HTML, CSS, Bootstrap 4, Javascript

In this post you'll learn how programmatically navigate with React Router v5+ and the new useHistory hook! To programmatically navigate means to use JavaScript, i.e. program code, a function or method call. If you just want a straight-up hyperlink then your best bet is , otherwise here we go!

Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. To learn more, see our tips on writing great answers.

Programmatic navigation refers to when a user is redirected as a result of an action that occurs on a route, like a login or signup action. In this article, we'll look at a myriad of approaches to navigating programmatically with React Router. The React ideology consists of three core concepts: the user event, state management and render function.

I have a React component and I want to load in my JSON data from a file.

The cryptocurrency industry has experienced interest from developers, entrepreneurs, and enthusiasts from around the globe. When Ethereum ERC20 tokens became more popular, the hottest trend was to create a token to be auctioned off within an ICO and traded or used as a utility within projects.

So if you are looking for examples to help you build cool and fun animations for your web projects, here are some silky smooth animation examples with React.

The Menu attribute - anchorEl, is responsible for passing the location of the button that called it, not true to say this, but only to be easy to understand. In this way, you should refer whenever there is a click. I suggest you use the reaction hooks, which makes the component clean.

Menus display a list of choices on temporary surfaces. A menu displays a list of choices on a temporary surface. It appears when the user interacts with a button, or other control. A basic menu opens over the anchor element by default (this option can be changed via props).

Node.js is one of the hottest server-side technologies you can learn these days. It is an open-source, cross-platform, backend JavaScript runtime environment. Ryan Dahl (the creator of Node.js) made...

Posting data to API's has never been easy. But have you ever used React to post form data to Google Sheets? If not, then this tutorial is for you. Today, we are going to talk about how to POST form data from React to Google Sheets like REST APIs.

To make your web projects more interactive and user-friendly, you may find you want to add some additional features like notifications, or a spinner that shows a loading state. Today we are going to explore how we can implement those features.

Tt is easy to use functional components with react hooks API. In this tutorial, we are going to use RTC React Video SDK to build video calling app in react js. Video SDK React JS SDK makes it easy to build real time video conferencing application.

In this post I will be talking about some great VSCode extensions for JavaScript Developers. NOTE: This list does not include extensions meant only for a single framework/library. So let's get started!!! These extensions provide code snippets. 1.

What is a Promise? A promise is an object that may provide a value sometime in the future: either a resolved value or a reason that it's not resolved (e.g., an error occurred). A promise may be in one of 3 possible states: fulfilled, rejected, or pe...

In this tutorial I will show you step-by-step how to create your first front-end to interact with a smart contract deployed at RSK local network, using only JavaScript and HTML and connected to a wallet using a web3 provider. Overview Below is the su...

const BottomTabsData = [ { id: 'currency-tab', title: 'Currency', icon: Currency, activeIcon: CurrencyLG, }, { id: 'converter-tab', title: 'Converter', icon: Converter, activeIcon: ConverterLG, }, { id: 'gold-tab', title: 'Gold', icon: Gold, activeIcon: GoldLg, }, { id: 'settings-tab', title: 'Settings', icon: Settings, activeIcon: SettingsLG, }, ]; import {BottomTabs} from 'rn-animated-tabbar'; { // call your navigation method }} /> import {createBottomTabNavigator} from '@react-navigation/bottom-tabs'; import {BottomTabs} from 'rn-animated-tabbar'; const TabsNavigator = createBottomTabNavigator(); ( { // call your navigation method }} /> )}

QuickNode guides are designed with beginners in mind. Learn all about developing on Web3.

Being a web developer one must be aware of some awesome debugging techniques. To be honest I have been using console.log() along with debugger to debug my code, but debugging is not limited to these two. I have came across some great articles informing there is so much more.

If you are a React developer, then React Router must not be an Alien to you. React Router is a fully-featured client and server-side routing library for React, a JavaScript library for building user interfaces. React Router runs anywhere React runs; on the web, on the server with node.js, and on React Native.

Greeting! folks, If you don't want to save your JWT-token in the client side then I believe that's why you're here, So welcome. In this article am going to show you how to handle authentication, JWT & HttpOnly Cookies with Next.js. This example will go with any API endpoints you are using.