Channels are “subreddits inside Farcaster.” Technically, a channel is a collection of casts that share a common channel_id. For example, the memes channel is a collection of casts that share the channel_id memes.

This guide demonstrates how to use the Neynar SDK to fetch casts from a channel.

Check out this Getting started guide to learn how to set up your environment and get an API key.

First, initialize the client:

// npm i @neynar/nodejs-sdk
import { NeynarAPIClient, Configuration } from "@neynar/nodejs-sdk";
import { FeedType,FilterType } from "@neynar/nodejs-sdk/build/api/index.js";

// make sure to set your NEYNAR_API_KEY .env
// don't have an API key yet? get one at neynar.com
const config = new Configuration({
  apiKey: process.env.NEYNAR_API_KEY,
});

const client = new NeynarAPIClient(config);

Then, fetch the feed in the memes channel.

const client = new NeynarAPIClient(config);
const channelId = "memes";
const filterType = FilterType.ChannelId;

const feed = await client.fetchFeed({
  feedType: FeedType.Filter,
  filterType,
  channelId,
});

console.log(feed);

Example output:

{
  casts: [
    {
      object: "cast_hydrated",
    hash: "0xf17168571d5e403f3b608ea2cc09a0b711d4c4fc",
    thread_hash: "0xf17168571d5e403f3b608ea2cc09a0b711d4c4fc",
    parent_hash: null,
    parent_url: "chain://eip155:1/erc721:0xfd8427165df67df6d7fd689ae67c8ebf56d9ca61",
    parent_author: [Object ...],
    author: [Object ...],
    text: "",
    timestamp: "2023-11-27T14:40:12.000Z",
    embeds: [
      [Object ...]
    ],
    reactions: [Object ...],
    replies: [Object ...],
    mentioned_profiles: []
  }, {
    object: "cast_hydrated",
    hash: "0x344dcd9c7c2671450628aacd0bbb8e29ea2e8809",
    thread_hash: "0x344dcd9c7c2671450628aacd0bbb8e29ea2e8809",
    parent_hash: null,
    parent_url: "chain://eip155:1/erc721:0xfd8427165df67df6d7fd689ae67c8ebf56d9ca61",
    parent_author: [Object ...],
    author: [Object ...],
    text: "sorry",
    timestamp: "2023-11-27T14:24:32.000Z",
    embeds: [
      [Object ...]
    ],
    reactions: [Object ...],
    replies: [Object ...],
    mentioned_profiles: []
  }, {
    object: "cast_hydrated",
    hash: "0x68b94ec2a10ebad8b13e3b673f0db02dd3280f42",
    thread_hash: "0x68b94ec2a10ebad8b13e3b673f0db02dd3280f42",
    parent_hash: null,
    parent_url: "chain://eip155:1/erc721:0xfd8427165df67df6d7fd689ae67c8ebf56d9ca61",
    parent_author: [Object ...],
    author: [Object ...],
    text: "man today is such a nice morning",
    timestamp: "2023-11-27T13:30:11.000Z",
    embeds: [
      [Object ...]
    ],
    reactions: [Object ...],
    replies: [Object ...],
    mentioned_profiles: []
  }
],
next: {
  cursor: "eyJ0aW1lc3RhbXAiOiIyMDIzLTExLTI3IDEzOjMwOjExLjAwMDAwMDAifQ=="
}
}

To fetch the next page of the feed, use the cursor:

const nextFeed = await client.fetchFeed({
 feedType: FeedType.Filter,
  filterType: FilterType.ChannelId,
  channelId,
  cursor: feed.next.cursor,
});

There you go! You now know how to fetch casts from a Farcaster channel with Neynar SDK.

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