Retrive the price of any bsc token from it's address without using external service like poocoin/dextools

tokenPriceApi.js

let pancakeSwapAbi =  [
{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsOut","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},
];
let tokenAbi = [
{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},
];
const Web3 = require('web3');

/*
Required Node.js

-- Web3 Token Charting --

Checkout my repo about building a clone of poocoin/dextools on bsc/pancakeswap and on any other similar chain/dex

https://github.com/Linch1/Web3TokenCharting


-- Usage --

1. Make a directory on your pc
2. Open a terminal 
3. go inside the created directory
4. run : npm init
5. run : npm i --save web3

6. Create a file: tokenPrice.js
7. Copy this text inside that file
8. run: node tokenPrice.js

-- Direct contact --
https://www.reddit.com/user/Linch-1
*/


let pancakeSwapContract = "0x10ED43C718714eb63d5aA57B78B54704E256024E".toLowerCase();
const web3 = new Web3("https://bsc-dataseed1.binance.org");
async function calcSell( tokensToSell, tokenAddres){
    const web3 = new Web3("https://bsc-dataseed1.binance.org");
    const BNBTokenAddress = "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c" //BNB

    let tokenRouter = await new web3.eth.Contract( tokenAbi, tokenAddres );
    let tokenDecimals = await tokenRouter.methods.decimals().call();
    
    tokensToSell = setDecimals(tokensToSell, tokenDecimals);
    let amountOut;
    try {
        let router = await new web3.eth.Contract( pancakeSwapAbi, pancakeSwapContract );
        amountOut = await router.methods.getAmountsOut(tokensToSell, [tokenAddres ,BNBTokenAddress]).call();
        amountOut =  web3.utils.fromWei(amountOut[1]);
    } catch (error) {}
    
    if(!amountOut) return 0;
    return amountOut;
}
async function calcBNBPrice(){
    const web3 = new Web3("https://bsc-dataseed1.binance.org");
    const BNBTokenAddress = "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c" //BNB
    const USDTokenAddress  = "0x55d398326f99059fF775485246999027B3197955" //USDT
    let bnbToSell = web3.utils.toWei("1", "ether") ;
    let amountOut;
    try {
        let router = await new web3.eth.Contract( pancakeSwapAbi, pancakeSwapContract );
        amountOut = await router.methods.getAmountsOut(bnbToSell, [BNBTokenAddress ,USDTokenAddress]).call();
        amountOut =  web3.utils.fromWei(amountOut[1]);
    } catch (error) {}
    if(!amountOut) return 0;
    return amountOut;
}
function setDecimals( number, decimals ){
    number = number.toString();
    let numberAbs = number.split('.')[0]
    let numberDecimals = number.split('.')[1] ? number.split('.')[1] : '';
    while( numberDecimals.length < decimals ){
        numberDecimals += "0";
    }
    return numberAbs + numberDecimals;
}
/*

How it works?
This script simply comunicates with the smart contract deployed by pancakeswap and calls the main
function that was build to retrive the token prices
*/
(async () => {
    const tokenAddres = '0xa49e44976c236beb51a1f818d49b9b9759ed97b1'; // change this with the token addres that you want to know the 
    let bnbPrice = await calcBNBPrice() // query pancakeswap to get the price of BNB in USDT
    console.log(`CURRENT BNB PRICE: ${bnbPrice}`);
    // Them amount of tokens to sell. adjust this value based on you need, you can encounter errors with high supply tokens when this value is 1.
    let tokens_to_sell = 1; 
    let priceInBnb = await calcSell(tokens_to_sell, tokenAddres)/tokens_to_sell; // calculate TOKEN price in BNB
    console.log( 'SHIT_TOKEN VALUE IN BNB : ' + priceInBnb + ' | Just convert it to USD ' );
    console.log(`SHIT_TOKEN VALUE IN USD: ${priceInBnb*bnbPrice}`); // convert the token price from BNB to USD based on the retrived BNB value
})();