Load a local json file keypair

When running your local project may sometimes want to use local keypair. The default keypair path generated by the Solana CLI is ~/.config/solana/id.json.

You can generate a custom keypair using the Solana CLI command solana-keygen grind --starts-with hi:1. This will generate a keypair with a public key starting with "hi" and output the keypair to a json file. You can then load this keypair using the helper function below.


export async function loadKeypairFromFile(
  filePath: string
): Promise<KeyPairSigner<string>> {
  // This is here so you can also load the default keypair from the file system.
  const resolvedPath = path.resolve(
    filePath.startsWith("~") ? filePath.replace("~", os.homedir()) : filePath
  );
  const loadedKeyBytes = Uint8Array.from(
    JSON.parse(fs.readFileSync(resolvedPath, "utf8"))
  );
  // Here you can also set the second parameter to true in case you need to extract your private key.
  const keypairSigner = await createKeyPairSignerFromBytes(loadedKeyBytes);
  return keypairSigner;
}

const keypairSigner = await loadKeypairFromFile("~/.config/solana/id.json");
console.log(keypairSigner.address);


export async function loadDefaultKeypairWithAirdrop(
  cluster: string