Ethereum Hardhat project configuration issue with INFURA API KEY
While setting up a new npx Hardhat project, you encounter an error when trying to import the Infura API key from your .env file. This issue is relatively common and can be resolved if you understand how to properly configure your Hardhat project.
Error: HH1201 A value cannot be found for the configuration variable ‘INFURA_API_KEY’
The HH1201 error indicates that the configuration variable INFURA_API_KEY cannot be found in your code. This error usually occurs when the code tries to access or use an environment variable, but it is not set.
How to fix the problem: Read your .env file
To resolve this issue, you need to make sure that your .env file is properly configured with the Infura API key. Here are some steps that may help you fix the problem:
Step 1: Create a new .env file
Create a new file called .env in the root of your project directory. This file will contain all the environmental variables.
touch .env
Step 2: Add the Infura API key to your .env file
Add the following line to your .env file:
INFURA_API_KEY=YOUR_INFURA_API_KEY_HERE
Replace YOUR_INFURA_API_KEY_HERE with your actual Infura API key.
For example, if you are using a private key or environment variable for your Infura API key, you can add it like this:
INFURA_API_KEY=YOUR_PRIVATE_KEY_HERE
Step 3: Update your Hardhat configuration
To use the Infura API in your Hardhat project, you need to update your configuration variables. Specifically, you need to set the INFURA_API_KEY variable.
You can do this by adding an infuraConfig.json file to the root of your project with the following content:
{
"key": "",
"secret": ""
}
If you are using a private key or environment variable for your Infura API key, update the INFURA_API_KEY field accordingly.
Step 4: Update the Hardhat project configuration
Update the hardhat.config.js file to use the updated configuration variables. Specifically, add the following line:
module.exports = {
// ... other configurations ...
defaultConfig: {
// ... other configurations ...
infura: {
key: process.env.INFURA_API_KEY,
secret: process.env.INFURA_SECRET
}
},
};
Step 5: Run the Hardhat project
Finally, run the Hardhat project with the following command:
npx hardhat
The INFURA_API_KEY variable should now be set correctly for the Infura API key.
Use Case Example
Here’s an example of how to use this configuration in a simple smart contract deployment:
const ethers = require('ethers');
// Hardhat Configurations
module.exports = {
// ... other configurations ...
defaultConfig: {
// ... other configurations ...
infura: {
key: process.env.INFURA_API_KEY,
secret: process.env.INFURA_SECRET
}
},
};
// Smart Contract Deployment
const deployment = new ethers.Deployer('0x...'); // replace with the address of your deployed contract
async function main() {
try {
const contractAddress = await deploymenter.address();
console.log(contractAddress);
} catch (error) {
console.error(error);
}
}
slim();
If you follow these steps, you should be able to resolve the HH1201 error and successfully use your Infura API key in your Hardhat project.