Pool details

gistfile1.txt

const nearAPI = require('near-api-js')
const { keyStores, KeyPair, connect } = nearAPI;
const keyStore = new keyStores.InMemoryKeyStore();
// const PRIVATE_KEY =
//   "by8kdJoJHu7uUkKfoaLd2J2Dp1q1TigeWMG123pHdu9UREqPcshCM223kWadm";
// // creates a public / private key pair using the provided private key
// const keyPair = KeyPair.fromString(PRIVATE_KEY);
// // adds the keyPair you created to keyStore
// await keyStore.setKey("testnet", "example-account.testnet", keyPair);

// create config
const config = {
  networkId: "mainnet",
  keyStore: keyStore,
  nodeUrl: "https://rpc.mainnet.near.org",
  walletUrl: "https://wallet.mainnet.near.org",
  helperUrl: "https://helper.mainnet.near.org",
  explorerUrl: "https://explorer.mainnet.near.org",
};


async function routes(fastify, options) {

    fastify.get('/pool', async (request, reply) => {

      // connect to NEAR
      const near = await connect(config);

      // get account
      const account = await near.account("name.near");

      // get contract
      const contract = new nearAPI.Contract(
        account, // the account object that is connecting
        "name.near",
        {
          // name of contract you're connecting to
          viewMethods: [], // view methods do not change state but usually return a value
          changeMethods: [], // change methods modify state
          sender: account, // account object to initialize and sign transactions.
        }
      );

      // pool details
      const response  = await account.viewFunction('name.near', 'get_fields_by_pool', {'pool_id': 'zavodil.poolv1.near'})

      return { response }
    })

}

module.exports = routes

maybe this code is not needed (but don't really know), because you're using the contract as an account and calling the viewFunction, instead of loading the contract and operating with it

      // get contract
      const contract = new nearAPI.Contract(
        account, // the account object that is connecting
        "name.near",
        {
          // name of contract you're connecting to
          viewMethods: [], // view methods do not change state but usually return a value
          changeMethods: [], // change methods modify state
          sender: account, // account object to initialize and sign transactions.
        }
      );

operating with the contract:

      const contract = new nearAPI.Contract(account, 'name.near', {
        viewMethods: ['get_all_fields', 'get_num_pools'],
        sender: account,
      })

      const poolsCount = await contract.get_num_pools()
      const pools = await contract.get_all_fields({ from_index: i * 100, limit: 100 })