Use ethers.js

Send a regular transaction from one account to another with the ethers.js JavaScript library.
Prerequisites
​Node.js.
An Ethereum account containing some Goerli test ETH. 
Use MetaMask or similar to create an Ethereum account for testing.
Steps
1. Create a project directory
Create a new directory:
mkdir infura
cd into the directory:
cd infura
2. install the dependencies
npm install --save ethers
3. Create a .env file
Create a .env file in your project directory to store the project and Ethereum account details.
ETHEREUM_NETWORK = "goerli"
INFURA_API_KEY = "<API-KEY>"
SIGNER_PRIVATE_KEY = "<PRIVATE-KEY>"
Ensure you replace the following values in the .env file:
<API-KEY> with the API key of the Web3 project.
<PRIVATE-KEY> with the private key of your Ethereum account. A transaction must be signed with the sender's private key.
If using a network other than Goerli, ensure you update ETHEREUM_NETWORK with the network name.
Never disclose your private key. Anyone with your private keys can steal any assets held in your account.
4. Create eip1559_tx.js file
In this example, we'll create a JavaScript file (eip1559_tx.js) in the project directory which configures and sends the transaction.
Replace to_account with the relevant details.
const { ethers } = require("ethers");
​
    async function main() {
      // Configuring the connection to an Ethereum node
      const network = process.env.ETHEREUM_NETWORK;
      const provider = new ethers.providers.InfuraProvider(
        network,
        process.env.INFURA_API_KEY
      );
      // Creating a signing account from a private key
      const signer = new ethers.Wallet(process.env.SIGNER_PRIVATE_KEY, provider);
​
      // Creating and sending the transaction object
      const tx = await signer.sendTransaction({
        to: "<to_account>",
        value: ethers.utils.parseUnits("0.001", "ether"),
      });
      console.log("Mining transaction...");
      console.log(`https://${network}.etherscan.io/tx/${tx.hash}`);
      // Waiting for the transaction to be mined
      const receipt = await tx.wait();
      // The transaction is now on chain!
      console.log(`Mined in block ${receipt.blockNumber}`);
    }
​
    require("dotenv").config();
    main();
5. Execute the transaction
Run the script:
node eip1559_tx.js
Example output:
Mining transaction...
https://goerli.etherscan.io/tx/0x7c5c0061fbda9e01c1bb1269ffc7323107e2116d8f7327ee945aecc7c33d21c8
Mined in block 7587728
You can search for the transaction on a block explorer like Goerli Etherscan.
6. Fine tune the transaction details (optional)
To change default values, update the signer.sendTransaction method to include an estimateGas result.
const limit = provider.estimateGas({
        from: signer.address,
        to: "<to_address_goes_here>",
        value: ethers.utils.parseUnits("0.001", "ether")
      });
​
// Creating and sending the transaction object
const tx = await signer.sendTransaction({
        to: "<to_address_goes_here>",
        value: ethers.utils.parseUnits("0.001", "ether"),
        gasLimit: limit,
        nonce: signer.getTransactionCount(),
        maxPriorityFeePerGas: ethers.utils.parseUnits("2", "gwei"),
        chainId: 3,
      });

Use Python

Deploy a contract using web3.js

Last modified 6mo ago