How to convert a private key from phantom (not the seed phrase) into format the CLI expects? (keypair.json, an array of numbers)

[come0x]

I have a private key from a phantom wallet (not the seed phrase). How do I convert it to the format the CLI expects? (array of numbers)

From Private Key from phantom = kahu3h1988178…
To keypair.json = [121,18,10…

I can’t believe this is not in the documentation

[zicklag]

Hi @come0x and welcome to the forum!

You are right, it is very annoying that Phantom doesn’t just allow exporting the private key as a JSON array like the commandline expects. I created a script to convert it. See this comment and the surrounding thread:

Recover account from private key

Thanks @blockchainlover2019! I don’t think you need to do the separate step to create the Keypair from the secret key. Here’s something that worked for me, and with Deno you can test it without needing to npm install or anything. script_url=https://gist.githubusercontent.com/zicklag/feb30b217b07c013641dbfce16a754eb/raw/471f27ba6dcda188cfbd83f44299637653bfc56a/base58-to-array.ts deno run $script_url [exported private key string from Phantom]