Decrease Liquidity

.env

INFURA_URL_TESTNET=
WALLET_ADDRESS=
WALLET_SECRET=

decreaseLiquidity.js

const { ethers } = require('ethers')
const { abi: INonfungiblePositionManagerABI } = require('@uniswap/v3-periphery/artifacts/contracts/interfaces/INonfungiblePositionManager.sol/INonfungiblePositionManager.json')

require('dotenv').config()
const INFURA_URL_TESTNET = process.env.INFURA_URL_TESTNET
const WALLET_ADDRESS = process.env.WALLET_ADDRESS
const WALLET_SECRET = process.env.WALLET_SECRET

const positionManagerAddress = "0xC36442b4a4522E871399CD717aBDD847Ab11FE88" // NonfungiblePositionManager

async function main() {
  const provider = new ethers.providers.JsonRpcProvider(INFURA_URL_TESTNET)

  const nonFungiblePositionManagerContract = new ethers.Contract(
    positionManagerAddress,
    INonfungiblePositionManagerABI,
    provider
  )

  const wallet = new ethers.Wallet(WALLET_SECRET)
  const connectedWallet = wallet.connect(provider)

  nonFungiblePositionManagerContract.connect(connectedWallet).positions(
    '99999' // your tokenId
  ).then((res) => {
    const totalLiquidity = res.liquidity.toString()
    const halfLiquidity = parseInt(totalLiquidity / 2)

    params = {
      tokenId: 99999, // your tokenId
      liquidity: halfLiquidity,
      amount0Min: 0,
      amount1Min: 0,
      deadline: Math.floor(Date.now() / 1000) + (60 * 10),
    }

    nonFungiblePositionManagerContract.connect(connectedWallet).decreaseLiquidity(
      params,
      { gasLimit: ethers.utils.hexlify(1000000)}
    ).then((res2) => {
      console.log(res2)
    })

  })
}

main()

package.json

{
  "name": "uniswap-decrease-liquidity",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@uniswap/v3-sdk": "^3.8.2",
    "dotenv": "^16.0.0",
    "ethers": "^5.6.5"
  }
}