Regarding this tutorial "Connect a local parachain": https://docs.substrate.io/tutorials/connect-other-chains/local-parachain/, it requires

  • using GUI in a browser to Reserve a ParaID on the relay chain (that is to use Polkadot-JS Apps connecting to your local relay chain)

I have searched on that Polkadot-launch repo https://github.com/paritytech/polkadot-launch/ and found nothing about that.

How can I use a command line(e.g. NodeJs) to do that?

1 Answer 1


Here is the pseudo code on how would you do it:

@import polkadot_api;

let reserver = 0xa_address_is_here;
let registrar.reserve(reserver, 2000);

Here is what registrar.reserve do.

Also refer to polkadot guide on how to call transaction and how to call rpc.

At this point, you sucessfully reserved a paraId. Now you can proceed to register parachain

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