uniswapExchange.js

const {ethers} = require("ethers");
const { abi: IUniswapV3PoolABI } = require('@uniswap/v3-core/artifacts/contracts/interfaces/IUniswapV3Pool.sol/IUniswapV3Pool.json');
const { abi: QuoterABI } = require('@uniswap/v3-periphery/artifacts/contracts/lens/Quoter.sol/Quoter.json');

const { getAbi, getPoolImmutables } = require('./helpers');

require('dotenv').config()
const INFURA_URL = process.env.INFURA_URL;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;

const provider = new ethers.providers.JsonRpcProvider(INFURA_URL)
const poolAddress = '0xcbcdf9626bc03e24f779434178a73a0b4bad62ed'
const quoterAddress = '0xb27308f9F90D607463bb33eA1BeBb41C27CE5AB6'

const getPrice = async (inputAmount) => {
    const poolContract = new ethers.Contract(poolAddress, IUniswapV3PoolABI, provider)

    const tokenAddress0 = await poolContract.token0();
    const tokenAddress1 = await poolContract.token1();

    console.log(tokenAddress0)
    console.log(tokenAddress1)

    const tokenAbi0 = await getAbi(tokenAddress0);
    const tokenAbi1 = await getAbi(tokenAddress1);

    const tokenContract0 = new ethers.Contract(tokenAddress0, tokenAbi0, provider)
    const tokenContract1 = new ethers.Contract(tokenAddress1, tokenAbi1, provider)

    const tokenSymbol0 = await tokenContract0.symbol();
    const tokenSymbol1 = await tokenContract1.symbol();
    const tokenDecimals0 = await tokenContract0.decimals();
    const tokenDecimals1 = await tokenContract1.decimals();

    const quoterContract = new ethers.Contract(quoterAddress, QuoterABI, provider)

    const immutables = await getPoolImmutables(poolContract)

    const amountIn = ethers.utils.parseUnits(
        inputAmount.toString(),
        tokenDecimals0
    )

    const quotedAmountOut = await quoterContract.callStatic.quoteExactInputSingle(
        immutables.token0,
        immutables.token1,
        immutables.fee,
        amountIn.toString(),
        0
    )

    const amountOut = ethers.utils.formatUnits(quotedAmountOut, tokenDecimals1)

    console.log('================')
    console.log(`${inputAmount} ${tokenSymbol0} can be swapped for ${amountOut} ${tokenSymbol1}`)
    console.log('================')

}

getPrice(1)