Install NEAR CLI (https://github.com/near/near-cli)
npm install -g near-cli
near view dip3.mintspace2.testnet nft_tokens '{"from_index": "0", "limit": 10}'
near view dip3.mintspace2.testnet nft_tokens_for_owner '{"account_id":"testbase.testnet", "from_index": "0", "limit": 10}'