CountNumUniswapV2Pairs.js

import IUniswapV2Factory from "@uniswap/v2-core/build/IUniswapV2Factory.json" assert {type: "json"};
import { ethers } from 'ethers';
const provider = new ethers.providers.InfuraProvider("homestead", INFURA_KEY);
const UniswapV2FactoryAddress = '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f';

(async () => {
  const factory =  new ethers.Contract( UniswapV2FactoryAddress , IUniswapV2Factory.abi , provider )
  let numPairs = await factory.allPairsLength();
  console.log('Number of Uniswap V2 Trading Pairs:', numPairs.toString());
}) ();

//Prints --> Number of Uniswap V2 Trading Pairs: 69636