src/lib/nip11.ts


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import { fetchRelayInformation } from 'nostr-tools/nip11';

// Accepts a list of relays, and returns a list of the relays that support all the provided NIPs.
export const relaysSupporting = async (relays: string[], nips: number[]) => {
    let supportingRelays = [];

    for (const relay of relays) {
        const relayInfo = await fetchRelayInformation(relay);
        if (nips.every(relay => relayInfo.supported_nips.includes(relay))) {
            supportingRelays.push(relay);
        }
    }

    return supportingRelays;
}