Cat-11 · T528 · DLT & Tokenization

NFT Metadata Validator

Paste your ERC-721 or ERC-1155 metadata JSON and check it against the OpenSea metadata standard: required fields (name, description, image), recommended fields (external_url, animation_url, attributes), attribute entry structure (trait_type and value), and the presence of a license field. Schema check only, performed entirely in your browser before mint.

This tool checks the schema and structure of NFT metadata JSON against published OpenSea and ERC-721/1155 conventions. It does not guarantee acceptance by any marketplace, and it is not legal advice on license or rights matters.
ERC-721 · ERC-1155 OpenSea Schema Zero PII Client-Side
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Paste the full JSON object that would be served at your token's tokenURI. Both ERC-721 and ERC-1155 metadata formats are accepted.