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API endpoint

This tutorial uses the GET v2/feed endpoint
Imagine you want to create a feed for casts in the Neynar channel. Casts on the Farcaster protocol can be under any parent_url, parent_urls are just arbitrary strings. Different clients choose to show their chosen list of parent_urls and some clients like Warpcast refer to them as “channels”.
channel feed

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Create a channel feed

In this example, we will try to create a feed for the Neynar channel. If you are looking for the parent_urls for the channels on Warpcast, you can find them in the Farcaster Channels Repository. You will need the right parent_url to fetch channel data.

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Ensure you have the right environment setup

Make sure to have node.js, typescript (ts) and yarn installed on your machine

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Create a new typescript file with the right imports

import { NeynarAPIClient, isApiErrorResponse } from "@neynar/nodejs-sdk";
import { AxiosError } from "axios";

import {
  FeedType, FilterType,
} from "@neynar/nodejs-sdk/build/neynar-api/neynar-v2-api";

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Initialize the client

const client = new NeynarAPIClient("API_KEY");

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Call fetchFeedPage function to get feed

(async () => {
  try {
    const cast =
      await client.fetchFeedPage(FeedType.Filter, {
        filterType: FilterType.ParentUrl,
        parentUrl: "chain://eip155:1/erc721:0xd4498134211baad5846ce70ce04e7c4da78931cc",
        limit: 1, // change to however many casts you want to fetch at once (max 100)
        withRecasts: true,
      });
    console.log(JSON.stringify(cast));
  } catch (error) {
    // isApiErrorResponse can be used to check for Neynar API errors
    // handle errors accordingly
    if (isApiErrorResponse(error)) {
      console.log("API Error", error.response.data);
    } else {
      console.log("Generic Error", error);
    }
  }
})();

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Run your new .ts file

  • Navigate to the right folder in your terminal e.g. cd ./test-sdk
  • Run script by typing yarn start into the terminal

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You should now see an output like this

{
  "casts": [
    {
      "hash": "0xfb5f785e80cab58bb3ca9f3087b812d320846043",
      "thread_hash": "0xfb5f785e80cab58bb3ca9f3087b812d320846043",
      "parent_hash": null,
      "parent_url": "chain://eip155:1/erc721:0xd4498134211baad5846ce70ce04e7c4da78931cc",
      "parent_author": {
        "fid": null
      },
      "author": {
        "object": "user",
        "fid": 976,
        "custody_address": "0xae6706fe1cb6887e5ed9b2e7e64ba78ba9c5e785",
        "username": "ba",
        "display_name": "Ben Adamsky",
        "pfp_url": "https://i.seadn.io/gae/-pmvC99Hw8fLjFKEIT3GxNs7qBhivAAUlIuVNXAykd06pUWSiAsypeLL8Q28dkjRtgXtNp07dLECv2p9P5MiqTrcmCR9OyYnAmO27Q?w=500&auto=format",
        "profile": {
          "bio": {
            "text": "surveyooor @survey x @ponder, eng @ freeport.app, benadamsky.com",
            "mentioned_profiles": []
          }
        },
        "follower_count": 472,
        "following_count": 345,
        "verifications": [
          "0x64ff33b653b26edcb4644e27d3720f3c653f8371"
        ],
        "active_status": "active"
      },
      "text": "Added the fid of each channel lead on the farcaster channels directory, I hope this is useful to other devs too!\n\nhttps://github.com/neynarxyz/farcaster-channels",
      "timestamp": "2023-11-15T21:42:45.000Z",
      "embeds": [
        {
          "url": "https://github.com/neynarxyz/farcaster-channels"
        }
      ],
      "reactions": {
        "likes": [
          {
            "fid": 6546,
            "fname": "artlu"
          },
          {
            "fid": 10259,
            "fname": "alexgrover"
          },
          {
            "fid": 299,
            "fname": "stout"
          },
        ],
        "recasts": [
          {
            "fid": 616,
            "fname": "dylsteck"
          },
          {
            "fid": 2455,
            "fname": "notdevin.eth"
          },
          {
            "fid": 194,
            "fname": "rish"
          }
        ]
      },
      "replies": {
        "count": 2
      },
      "mentioned_profiles": []
    }
  ],
  "next": {
    "cursor": "eyJ0aW1lc3RhbXAiOiIyMDIzLTExLTE1IDIxOjQyOjQ1LjAwMDAwMDAifQ=="
  }
}
You get all the data in one request, making it easy to display or use in your next operation. If you want to try getting a live response, head over to our API page for v2/feed. You can take the cursor from the output and pass it in the next request to the SDK to page to the next set of results.

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Ready to start building?

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