This script will unpin all files from your Pinata account! You can alter the PIN_QUERY to adjust it if you only want to delete a range of files

unpins.js

const axios = require('axios')
const PINATA_JWT = 'Bearer PASTE_YOUR_JWT'
const PIN_QUERY = 'https://api.pinata.cloud/data/pinList?status=pinned&includesCount=false&pageLimit=1000'

let pinHashes = []

const deletePinFromIPFS = async (hashToUnpin) => {
  try {
    const res = await axios.delete(`https://api.pinata.cloud/pinning/unpin/${hashToUnpin}`, {
      headers: {
        Authorization: PINATA_JWT
      }
    })
    console.log(res.status)
  } catch (error) {
    console.log(error)
  }
}
const wait = async (time) => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve();
    }, time)
  });
}

const fetchPins = async () => {
  try {
    const res = await axios.get(PIN_QUERY, {
      headers: {
        Authorization: PINATA_JWT
      }
    })
    const responseData = res.data.rows
    responseData.forEach(row => {
      pinHashes.push(row.ipfs_pin_hash)
    })
    console.log(pinHashes)
  } catch (error) {
    console.log(error)
  }
}

const bulkUnpin = async () => {
  try {
    for(const hash of pinHashes){
      await deletePinFromIPFS(hash)
      await wait(200)
    }
    pinHashes = []
   } catch (error){
    console.log(error)
  }
}

const main = async () => {
  await fetchPins()
  while(pinHashes){
    await bulkUnpin()
    await fetchPins()
  }
}

main()

Modified version for pinata submarine

`const axios = require('axios');
const PIN_QUERY =
'https://managed.mypinata.cloud/api/v1/content?status=pinned&includesCount=false&pageLimit=1000';

let pinHashes = [];

const PINATA_SUB_KEY = ''; // add your sub api key here

const deletePinFromIPFS = async (hashToUnpin) => {
try {
const res = await axios.delete(https://managed.mypinata.cloud/api/v1/content/${hashToUnpin}, {
headers: {
'x-api-key': PINATA_SUB_KEY,
},
});
console.log('successfully unpinned: ', hashToUnpin);
} catch (error) {
console.log('failed to unpin: ', hashToUnpin);
}
};
const wait = async (time) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve();
}, time);
});
};

const fetchPins = async () => {
try {
const res = await axios.get(PIN_QUERY, {
headers: {
'x-api-key': PINATA_SUB_KEY,
},
});
// console.log(res.data.items);
const responseData = res.data.items;
responseData.forEach((row) => {
pinHashes.push(row.cid);
});
// console.log(pinHashes);
} catch (error) {
console.log('failed to fetch pin');
}
};

const bulkUnpin = async () => {
try {
for (const hash of pinHashes) {
await deletePinFromIPFS(hash);
await wait(200);
}
pinHashes = [];
} catch (error) {
console.log('failed to bulkunpin');
}
};

const main = async () => {
await fetchPins();
while (pinHashes) {
await bulkUnpin();
await fetchPins();
}
};

main();
`