How to get multiple accounts info with jsonParsed encoding using @solana/web3.js?

Question

Currently, I can do this using a cURL request:

 curl http://localhost:8899 -X POST -H "Content-Type: application/json" -d '
  {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getMultipleAccounts",
    "params": [
      [
        "AWaJ4oXHWXaNnFJirydYdXdD3Yjmkgh6rYhmwAyB5d8o",
        "yT2bBMrE4AVG3BM8LHjDSr1yketzabmfp3rYimS36C9"
      ],
      {
        "encoding": "jsonParsed"
      }
    ]
  }
'

This will return a response that contains JSON parsed data that is human readable:

{
  "jsonrpc": "2.0",
  "result": {
    "context": {
      "apiVersion": "1.10.29",
      "slot": 150852465
    },
    "value": [
      {
        "data": {
          "parsed": {
            "info": {
              "isNative": false,
              "mint": "4koajw4GkCgVNEjN14xmjCtMVYNASdDj7RtrAA4SZwnK",
              "owner": "GkeDRfHcACap2CM9oaWrb3QUMG7pk6F6EMYca8Lu52t8",
              "state": "initialized",
              "tokenAmount": {
                "amount": "12998020",
                "decimals": 6,
                "uiAmount": 12.99802,
                "uiAmountString": "12.99802"
              }
            },
            "type": "account"
          },
          "program": "spl-token",
          "space": 165
        },
        "executable": false,
        "lamports": 2039280,
        "owner": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA",
        "rentEpoch": 348
      }
    ]
  },
  "id": 1
}

I want to use the same method by using the @solana/web3.js library:

const accounts = await connection.getMultipleAccountsInfo([new PublicKey("AWaJ4oXHWXaNnFJirydYdXdD3Yjmkgh6rYhmwAyB5d8o"), new PublicKey("yT2bBMrE4AVG3BM8LHjDSr1yketzabmfp3rYimS36C9")]);

This doesn't return JSON parsed account data, but it's using Buffer. I can use the method connection.getParsedAccountInfo() to get the JSON parsed data and it works great, but it's not efficient. I will be parsing multiple token balances from 500+ accounts. Is it possible to convert the Buffer structure to parse token balance from it? I would need the uiAmountString:

Everything works perfectly fine by using a cURL request, but the web3.js library doesn't seem to have this implemented?

Answer 1

It doesn't look like the web3.js implementation of getMultipleAccounts supports parsed encoding replies. You can either open a feature request issue against the library in the monorepo on github (assuming one doesn't already exist) or better yet, implement it yourself and submit a PR.

This could be implemented either by adding a new encoding field to the GetMultipleAccountsConfig structure or by adding a new method akin to getParsedAccountInfo (as getParsedMultipleAccountsInfo ?)

Answer 2

For token accounts specifically, if all the token accounts you want to fetch are owned by the same pubkey, you can use getParsedTokenAccountsByOwner.

Otherwise, I believe web3.js is just a thin wrapper around the JSON RPC API so in the worst case you can probably implement the same thing that you did in CURL in js.