graph-node VS hardhat

A subgraph according to The Graph (which is a decentralized protocol for indexing and querying blockchain data) is a custom API built on blockchain data. They are queried using the GraphQL query language and are deployed to a Graph Node using the Graph CLI.

Event is a log entity which EVM smart contracts can emit during transaction execution. Events are very good at signalling that an some action has taken place on-chain. Applications can subscribe and listen to events to trigger some off-chain logic or they can index, transform and store events in some off-chain storage (look at The Graph protocol or Ethereum ETL).

Subgraph cloned from repo :https://github.com/graphprotocol/graph-node/tree/master/docker

https://github.com/scaffold-eth/scaffold-eth-2 this repo comes with wagmi and hard hat preconfigured you can use it as a sample , but if you are large querying data I would advise you the graph https://thegraph.com/

The Graph

There are also decentralized network services like The Graph or Pocket Network that provide decentralized access to Ethereum and other blockchain networks. Note that these services primarily provide APIs for querying blockchain data, and may not provide full functionality for sending transactions or executing smart contracts like a full Ethereum node or services like Infura and Alchemy.

For read-only the way to use The Graph

See it for yourself.

thegraph.com is the only site operated by The Graph Foundation, and is the centrepiece for all activity on the protocol. Can a website/web dApp be hacked? Yes. Has it been hacked in the past two years since it launched? No.

Hardhat or Truffle development environment

Hardhat

4. Hardhat and Truffle

Let's build a web frontend to a smart contract! This is a followup to my previous post about creating a simple smart contract with Solidity and Hardhat. The instructions here assume you are picking up up with the same contract that we just deployed to our Hardhat environment.

Welcome to my post about Smart Contract development! This post is mostly just my notes on how to get a super simple smart contract (self executing program on a blockchain) written, deployed and called. For me it is easier to learn something new by doing. When dealing with blockchains and smart contracts however, that "doing" becomes expensive when you are trying to do something many times for educational purposes. Since every write to a blockchain costs something (on Ethereum Virtual Machine, or EVM, based networks, this cost is referred to as a Gas Fee). To avoid the cost of writing to a real blockchain, we'll use a tool called Hardhat. Hardhat will simulate an EVM network/blockchain for us to play with. When you are ready to actually publish your Smart Contract to a real blockchain, you'll need to either run a node yourself or use a Node Provider like Alchemy.

Contracts: This directory contains all of the code for developing smart contracts using either the Foundry or Hardhat frameworks. Both frameworks have been structured to allow for rapid and easy DApp development. For this tutorial, we will focus on the Foundry framework.

Install Hardhat, OpenZeppelin, hardhat toolbox, and the axelar-gmp-sdk-solidity with the following commands:

Hardhat : Site officiel

Truffle and Hardhat both are quiet and commonly used packages