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ℹ️ Important: This repo is no longer maintained; we invite all people learning Solidity to head toCyfrin Updraft! The 100% free #1 smart contract education platform on earth. Developed with love by Patrick & Cyfrin <3

This is part of the FreeCodeCamp Solidity & Javascript Blockchain Course.

Video Link :⌨️ (05:30:42) Lesson 5: Ethers.js Simple Storage

• git
  • You'll know you did it right if you can rungit --version and you see a response likegit version x.x.x
• Nodejs
  • You'll know you've installed nodejs right if you can run:
    • node --version and get an ouput like:vx.x.x
• Yarn instead ofnpm
  • You'll know you've installed yarn right if you can run:
    • yarn --version and get an output like:x.x.x
    • You might need to install it with npm
• ganache
  • You'll know you did it right if you can run the application and see:
    
  • You can alternatively useganache-cli orhardhat

If you can't or don't want to run and install locally, you can work with this repo in Gitpod. If you do this, you can skip theclone this repo part.

Clone this repo

git clone https://github.com/PatrickAlphaC/ethers-simple-storagecd ethers-simple-storage

Then install dependencies

yarn

Note: You'll notice in ourpackage.json we are using"solc": "0.8.7-fixed". Usually, you'll just be able to do"solc": "0.8.7" to get a specific version, but there was a bit of an issue with that one... You'll find out why we use 0.8.7

If you liketypescript, rungit checkout typescript then runyarn

1. Run your ganache local chain, by hittingquickstart on your ganache application

Save the workspace. This way, next time you open ganache you can start the workspace you've created, otherwise you'll have to redo all the steps below.

2. Copy theRPC SERVER sting in your ganache CLI, and place it into your.env file similar to what's in.env.example.

.env Example:

RPC_URL=http://0.0.0.0:8545

3. Hit the key on one of the accounts, and copy the key you see and place it into your.env file, similar to what you see in.env.example.

.env Example:

PRIVATE_KEY=11ee3108a03081fe260ecdc106554d09d9d1209bcafd46942b10e02943effc4a

4. Compile your code

Run

yarn compile

You'll see filesSimpleStorage_sol_SimpleStorage.abi andSimpleStorage_sol_SimpleStorage.bin be created.

5. Run your application

node deploy.js

1. Run

yarn add ganache

2. Change Server settings in Ganache

Settings > Server > Host Name

Change Host Name to vEthernet (WSL)

3. Run your application

node deploy.js

Make sure you have ametamask or other wallet, and export the private key.

IMPORTANT

USE A METAMASK THAT DOESNT HAVE ANY REAL FUNDS IN IT. Just in case you accidentally push your private key to a public place. Ihighly recommend you use a different metamask or wallet when developing.

1. Export your private key and place it in your.env file, as done above.

2. Go toAlchemy and create a new project on the testnet of choice (ie, Sepolia)

3. Grab your URL associated with the testnet, and place it into your.env file.

4. Make sure you havetestnet ETH in your account. You canget some here. You should get testnet ETH for the same testnet that you made a project in Alchemy (ie, Sepolia)

5. Run

node deploy.js

Troubleshooting: Ethers 6.X.X instability

constprovider=newethers.providers.JsonRpcProvider(process.env.RPC_URL)^TypeError:Cannotreadpropertiesofundefined(reading'JsonRpcProvider')

If you are experiencing issues with the latest version of Ethers, ethers ^6.0.2, try

constprovider=newethers.JsonRpcProvider(process.env.RPC_URL)

as providers were migrated to ethers.* in version 6 (previously ethers.providers.*).reference:https://docs.ethers.org/v6/migrating/#migrate-providers

Or you can easily solve the problem by downgrading to a previous version of Ethers, such as ethers 5.7.2.

To downgrade to ethers 5.7.2, run either of the following commands on your command line interface, depending on your package manager:

For npm:

npm install ethers@5.7.2

For yarn:

yarn add ethers@5.7.2

If you appreciated this, feel free to follow me or donate!

ETH/Polygon/Avalanche/etc Address: 0x9680201d9c93d65a3603d2088d125e955c73BD65