Next.Js Example

An NFT marketplace made with Next.js & Solidity and deployed on Mumbai Testnet.

March 15th, 2023

An NFT marketplace made with Next.js & Solidity and deployed on Mumbai Testnet.'s picture



An open decentralized NFT Marketplace built with Solidity and Next.js, powered by Polygon Technologies. It basically is an open platform where users can mint and trade their own NFTs.

The Project

An open platform where users can mint their own NFTs and list them on a Marketplace or buy NFT from others. It includes:

  • A smart contract which represents a collection of NFTs by following the ERC-721 standard.
  • A smart contract which represents the NFT Marketplace and contains all the logic to make offers, execute offers...
  • A Next.js front-end application as a user interface.

NFTMarketplace Polygon(Mumbai Testnet) smart contract address:

Demo video

Project details

Users can access the application via web-browser, and must have the Metamask wallet installed. The interface, built with Next.js, relies on the ethers.js library to communicate with the smart contracts through Metamask. This means that the data reflected on the front-end application is fetched from the Polygon blockchain. Each action performed by the user (mint an NFT, sell NFT, buy NFT...) creates a transaction on Polygon, which will require Metamask confirmation and a small fee, and this transaction will permanently modify the state of the NFTMarketplace smart contracts. On top of it, user's NFT Metadata will be uploaded to the IPFS, generating a hash which will be permanently recorded on the blockchain to prove ownership.


Users can perform the following actions on the NFT Marketplace:


Input a name, description and upload a file (image) to mint an NFT. Once minted, a representation of this NFT will be displayed in the marketplace and it will be owned by its creator. This is open for everyone, meaning everyone can participate in this NFT creation through this platform.


A user can buy NFTs which someone else offered. This will require paying the requested price and a small fee.

Sell NFT

Users can sell their NFT by specifying its price (in MATIC). If someone fulfills this offer, then the NFT and its ownership is transferred to the new owner.

Smart Contract Visualization

Below you can view the current's smart contract functions (and its interactions).


These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Connect to Mumbai Testnet

First, it is required to install Metamask wallet browser extension:

Next, you need to configure Metamask to connect to the desired blockchain by using the following link: and add the network of your choice (Mumbai Testnet for now), by simply connecting your wallet from a test address.

Getting test MATIC

You can get up to 2 test MATIC / day by pasting your address here:


First, you will need to clone or fork the repository into your Github account:

git clone

Run the following command in your terminal after cloning the main repo:

npm install

At this point you will be able to run the frontend with:

npm run dev

Smart Contract development

Make sure to go through the official Docs:

Initialize hardhat by running the following command:

npx hardhat

First, you will have to set up a local network by running the following command:

npx hardhat node

After you are happy with your changes in NFTMarketplace.sol file, compile the smart contract:

npx hardhat compile

Deployment on Local Blockchain

Deploy the contracts on your local hardhat network by running the following command:

npx hardhat run scripts/deploy.js --network localhost

If all goes well, a new smart contract address refering the NFT Marketplace will be generated. Paste this address in the constants.js file.

Next, remove the argument provided in the JsonRpcProvider which is located in the line 111 of the NFTContext.js file.

Finally, run the frontend on a new terminal to open the User Interface:

npm run dev

A local instance of Polyplace will be up and running on your local environment.

Tech stack

  • Solidity
  • Next.js
  • hardhat
  • ethers.js
  • node.js
  • Metamask
  • IPFS
  • Infura
  • Alchemy

Future Ideas

  • Clear deploy on Polygon Mainnet.
  • Auction features.
  • Bulk upload of NFTs as collections.
  • Creator details and more.


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