Foundry NFT

About

This repository contains two Ethereum NFT projects built with Foundry

🛠️ Projects Included:

Basic NFT

A minimal ERC721-compliant NFT with:

Token URI support (off-chain metadata via IPFS/HTTP)

Minting

Mood NFT

An interactive NFT that lets owners change its mood:

Switch between predefined states (e.g., 😊 → 😢)

Demonstrates dynamic NFT behavior

🔧 Tech Stack

Solidity (ERC721 standard)

Foundry (Testing & Deployment)

OpenZeppelin Contracts (Secure base implementations)

Token URI

This repo will let you go through creating 2 different kinds of NFTs.

1. IPFS-Hosted NFT

Metadata and assets stored on IPFS (decentralized off-chain).

2. On-Chain SVG NFT

100% on-chain (SVG image and metadata embedded in the contract).

Getting Started

Requirements

• git
  • You'll know you did it right if you can run git --version and you see a response like git version x.x.x
• foundry
  • You'll know you did it right if you can run forge --version and you see a response like forge 0.2.0 (816e00b 2023-03-16T00:05:26.396218Z)

Quickstart

git clone https://github.com/fricpto/foundry-nft
cd foundry-nft
forge install
forge build

Usage

Start a local node

make anvil

Deploy

This will default to your local node. You need to have it running in another terminal in order for it to deploy.

make deploy

Testing

forge test

or

forge test --fork-url $SEPOLIA_RPC_URL

Test Coverage

forge coverage

Deployment to a testnet or mainnet

1. Setup environment variables

You'll want to set your SEPOLIA_RPC_URL and PRIVATE_KEY as environment variables. You can add them to a .env file.

• PRIVATE_KEY: The private key of your account (like from metamask). NOTE: FOR DEVELOPMENT, PLEASE USE A KEY THAT DOESN'T HAVE ANY REAL FUNDS ASSOCIATED WITH IT.
  • You can learn how to export it here.
• SEPOLIA_RPC_URL: This is url of the goerli testnet node you're working with. You can get setup with one for free from Alchemy

Optionally, add your ETHERSCAN_API_KEY if you want to verify your contract on Etherscan.

1. Get testnet ETH

Head over to faucets.chain.link and get some tesnet ETH. You should see the ETH show up in your metamask.

2. Deploy (IPFS NFT)

make deploy ARGS="--network sepolia"

3. Deploy (SVG NFT)

make deploySvg ARGS="--network sepolia"

Base64

To get the base64 of an image, you can use the following command:

echo "data:image/svg+xml;base64,$(base64 -i ./images/dynamicNft/happy.svg)"

Then, you can get the base64 encoding of the json object by placing the imageURI into happy_image_uri.json then running:

echo "data:application/json;base64,$(base64 -i ./images/dynamicNft/happy_image_uri.json)"

Estimate gas

You can estimate how much gas things cost by running:

forge snapshot

And you'll see and output file called .gas-snapshot

Formatting

To run code formatting:

forge fmt

Thank you!

Foundry

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

Foundry consists of:

• Forge: Ethereum testing framework (like Truffle, Hardhat and DappTools).
• Cast: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
• Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
• Chisel: Fast, utilitarian, and verbose solidity REPL.

Documentation

https://book.getfoundry.sh/

Usage

Build

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help