This is a nodejs + express webserver that acts as a proxy server to hide the metadata for unminted tokens in a NFT collection.
With this proxy you can pre-upload all of your metadata to IPFS or some other hosting provider, and not be afraid of users taking a peek at your entire collection before it's been minted.
Make sure you have the latest Node.js installed, clone the repo and then type
npm install
followed by
npm start
Alternatively, you can easily host this on Heroku:
All configuration is done via environment variables, which are as follows:
| Env Var | Description |
|---|---|
| CONTRACT_ADDRESS | Ethereum address for the NFT Smart Contract |
| ETHEREUM_RPC_URL | An endpoint for an Ethereum RPC provider, e.g. Infura or Alchemy |
| SOURCE_BASE_URI | The base url for your full source metadata, don't forget the trailing / |
Once the webserver is running, you can request token metadata at
localhost:3000/api/token-metadata/{tokenId}
If you're hosting on Heroku or some other hosting provider you will replace localhost:3000 with whatever the base url for your app is.
Test to make sure that it only returns the metadata for tokenIds that actually exist in your smart contract.
Once everything is working as expected, update the baseURI in your smart contract to the url of this server, including /api/token-metadata/.