Environment Setup - Jupiter Developers

Libraries

Install @solana/web3.js (v1) for transaction handling and @solana/spl-token for SPL token operations:

npm install @solana/web3.js@1 @solana/spl-token bs58

This documentation uses @solana/web3.js v1. Version 2 has a different API for transaction handling. Development Basics covers the Solana concepts the guides assume.

RPC Connection

import { Connection } from '@solana/web3.js';

const connection = new Connection('https://api.mainnet-beta.solana.com');

Solana provides a default RPC endpoint, but as your application grows, use a dedicated provider like Helius or Triton.

Development Wallet

Never hardcode private keys in source code. Use environment variables or the Solana CLI keyfile. The same applies to the API key you pass in x-api-key.

import { Keypair } from '@solana/web3.js';
import bs58 from 'bs58';
import 'dotenv/config';

const wallet = Keypair.fromSecretKey(bs58.decode(process.env.PRIVATE_KEY));

import { Keypair } from '@solana/web3.js';
import fs from 'fs';

const privateKeyArray = JSON.parse(
  fs.readFileSync('/Path/to/.config/solana/id.json', 'utf8').trim()
);
const wallet = Keypair.fromSecretKey(new Uint8Array(privateKeyArray));