This guide demonstrates how to fetch notifications (inbound mentions, replies, likes, recasts, quotes) of a Farcaster user with the Neynar SDK. Check out this Getting started guide to learn how to set up your environment and get an API key. First, initialize the client: 
import { NeynarAPIClient, Configuration } from "@neynar/nodejs-sdk";

// 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 notifications: 
const dwrFID = 3;
const notifications = await client.fetchAllNotifications({fid:dwrFID});

console.log(notifications);
Example output: 
{
  notifications: [
    {
      object: "notification",
      most_recent_timestamp: "2023-11-28T11:11:11.000Z",
      type: "likes",
      cast: [Object ...],
      reactions: [
        [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...]
      ]
    }, {
      object: "notification",
      most_recent_timestamp: "2023-11-28T11:10:56.000Z",
      type: "quote",
      cast: [Object ...],
      quotes: [
        [Object ...], [Object ...]
      ]
    }, {
      object: "notification",
      most_recent_timestamp: "2023-11-28T11:09:16.000Z",
      type: "likes",
      cast: [Object ...],
      reactions: [
        [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...]
      ]
    }, {
      object: "notification",
      most_recent_timestamp: "2023-11-28T11:05:59.000Z",
      type: "follows",
      follows: [
        [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...]
      ]
    }, {
      object: "notification",
      most_recent_timestamp: "2023-11-28T10:25:51.000Z",
      type: "likes",
      cast: [Object ...],
      reactions: [
        [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...],
        [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...], [Object ...]
      ]
    }
  ],
  next: {
    cursor: "eyJ0aW1lc3RhbXAiOiIyMDIzLTExLTI4IDEwOjI1OjUxLjAwMDAwMDAifQ=="
  }
}
So that’s what @dwr.eth sees on his Farcaster notification! To fetch the next page of notifications, use the cursor: 
const nextNotifications = await client.fetchAllNotifications({
  fid: dwrFID,
  cursor: notifications.next.cursor,
});
To only fetch specific types of notifications like replies, mentions, and quotes, use the fetchMentionAndReplyNotifications function: 
const mentionsAndReplies = await client.fetchAllNotifications({
  fid: dwrFID,
});
console.log(mentionsAndReplies);
Example output: 
{
  result: {
    notifications: [
      [Object ...], [Object ...], [Object ...], [Object ...], [Object ...]
    ],
    next: {
      cursor: "eyJ0aW1lc3RhbXAiOiIyMDIzLTExLTI4IDA3OjI5OjI4LjAwMDAwMDAifQ=="
    }
  }
}
To fetch the next page of mentions and replies, use the cursor: 
const nextMentionsAndReplies = await client.fetchAllNotifications({
  fid: dwrFID,
  cursor: mentionsAndReplies.next.cursor,
});
console.log(nextMentionsAndReplies);
That’s it! You can now fetch notifications of any Farcaster user.

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