JSON object not formatting properly

Question

I have some code that fetches data from an API and writes it to a file, the API returns tokenIdMetadata that has a bunch of information in it that I do not want so I made it into a new JSON object tokenMetadata and save that to a file as seen below.

const tokenIdMetadata = await Moralis.Web3API.token.getTokenIdMetadata(options);
const tokenMetadata = {};
tokenMetadata.token_id = tokenIdMetadata.token_id;
tokenMetadata.metadata = tokenIdMetadata.metadata;
fs.writeFileSync(folderName.concat('/', collectionSlug, '_', tokenID, '.json'), JSON.stringify(tokenMetadata, null, 4));

The problem is the code returns a string in the JSON file that is not formatted properly

 "token_id": "4",
 "metadata": "{\"name\":\"Arcade Land Mega #4\",\"image\":\"ipfs://QmaJyxmwWkH17P7cpzRDFqcQwh7HYZ53VS9pJN3rtWKVPh\",\"description\":\"Arcade Lands are digital properties in an interoperable metaverse that serves as your web3 home for all your NFTs. Land owners will get additional benefits within the Arcadeverse.\",\"attributes\":[{\"trait_type\":\"Size\",\"value\":\"Mega\"},{\"trait_type\":\"Area\",\"value\":\"Frozen\"},{\"trait_type\":\"Underground\",\"value\":\"Weird Rocks\"}]}"

This is how it should be formatted

"token_id" : "4",
"metadata" : {
  name: 'Arcade Land Mega #4',
  image: 'ipfs://QmXYYbVEFqVPRELzPN3fgCw9v3wr2iQqixbVaGS1JTH6mS',
  description: 'Arcade Lands are digital properties in an interoperable metaverse that serves as your web3 home for all your NFTs. Land owners will get additional benefits within the Arcadeverse.',
  attributes: [
    { trait_type: 'Size', value: 'Mega' },
    { trait_type: 'Area', value: 'Frozen' },
    { trait_type: 'Underground', value: 'Weird Rocks' }
  ]
}

I was wondering how I would go about fixing this.

Answer 1

I have checked example result of this API call in the documentation https://docs.moralis.io/moralis-dapp/web3-api/token#gettokenidmetadata . It looks like this is about failing to decode incoming JSON. I think replacing tokenIdMetadata.metadata by JSON.parse(tokenIdMetadata.metadata) should fix that.

The final code should look like the following:

const tokenIdMetadata = await Moralis.Web3API.token.getTokenIdMetadata(options);
const tokenMetadata = {};
tokenMetadata.token_id = tokenIdMetadata.token_id;
tokenMetadata.metadata = JSON.parse(tokenIdMetadata.metadata);
fs.writeFileSync(folderName.concat('/', collectionSlug, '_', tokenID, '.json'), JSON.stringify(tokenMetadata, null, 4));