Parse Cosmwasm contract state.

01-main.js

const fs = require('fs');

// state.json -> GET /cosmwasm/wasm/v1/contract/{contract}/state
function main() {
    const data = fs.readFileSync('cw721-state.json', 'utf8');
    const state = JSON.parse(data);

    const items = [];
    state.models.forEach(m => {
        items.push({
            key: parseKey(m.key),
            value: parseValue(m.value)
        });
    });

    console.log(JSON.stringify(items, null, 2));
}

function parseKey(key) {
    const data = Buffer.from(key, 'hex');

    const keys = [];
    let len, start;
    for (let i = 0; i < data.length;) {
        const val = data[i];
        if (val === 0) {
            len = data[i + 1];
            start = i + 2;
        } else {
            len = data.length - i;
            start = i;
        }

        i = start + len;
        keys.push(data.subarray(start, i).toString('utf8'));
    }

    return keys;
}

function parseValue(value) {
    const data = Buffer.from(value, 'base64');

    return JSON.parse(data.toString('utf8'));
}

main();

cw721-state.json

{
    "models": [
      {
        "key": "0006746F6B656E7330413243353836373344423634344645",
        "value": "eyJvd25lciI6Imp1bm8xOTR2OHV3ZWUyZnZzMnM4ZmE1azdqMDNrdHdjODdoNXl5dm5hajQiLCJhcHByb3ZhbHMiOltdLCJ0b2tlbl91cmkiOiJpcGZzOi8vUW1WR1dYY3ZldkFSdXNZZkNmN0ZYcmNoRW9yNkZzd0RjZ2V0alZReWpuZnV1RSIsImV4dGVuc2lvbiI6bnVsbH0="
      },
      {
        "key": "000D746F6B656E735F5F6F776E6572002B6A756E6F313934763875776565326676733273386661356B376A30336B747763383768357979766E616A3430413243353836373344423634344645",
        "value": "MTY="
      },
      {
        "key": "636F6E74726163745F696E666F",
        "value": "eyJjb250cmFjdCI6ImNyYXRlcy5pbzpjdzcyMS1iYXNlIiwidmVyc2lvbiI6IjAuMTAuMSJ9"
      },
      {
        "key": "6D696E746572",
        "value": "Imp1bm8xOTR2OHV3ZWUyZnZzMnM4ZmE1azdqMDNrdHdjODdoNXl5dm5hajQi"
      },
      {
        "key": "6E66745F696E666F",
        "value": "eyJuYW1lIjoiTW9uZXRhIE5GVCIsInN5bWJvbCI6Ik1PTkVUQSJ9"
      },
      {
        "key": "6E756D5F746F6B656E73",
        "value": "MQ=="
      }
    ],
    "pagination": {
      "next_key": null,
      "total": "6"
    }
}

result.json

[
   {
      "key":[
         "tokens",
         "0A2C58673DB644FE"
      ],
      "value":{
         "owner":"juno194v8uwee2fvs2s8fa5k7j03ktwc87h5yyvnaj4",
         "approvals":[
            
         ],
         "token_uri":"ipfs://QmVGWXcvevARusYfCf7FXrchEor6FswDcgetjVQyjnfuuE",
         "extension":null
      }
   },
   {
      "key":[
         "tokens__owner",
         "juno194v8uwee2fvs2s8fa5k7j03ktwc87h5yyvnaj4",
         "0A2C58673DB644FE"
      ],
      "value":16
   },
   {
      "key":[
         "contract_info"
      ],
      "value":{
         "contract":"crates.io:cw721-base",
         "version":"0.10.1"
      }
   },
   {
      "key":[
         "minter"
      ],
      "value":"juno194v8uwee2fvs2s8fa5k7j03ktwc87h5yyvnaj4"
   },
   {
      "key":[
         "nft_info"
      ],
      "value":{
         "name":"Moneta NFT",
         "symbol":"MONETA"
      }
   },
   {
      "key":[
         "num_tokens"
      ],
      "value":1
   }
]