Farcaster; Extract channel members

index.ts

import { createObjectCsvWriter } from 'csv-writer';

const API_KEY = process.env.NEYNAR_API_KEY!;
const channelId = "daos"; // Replace with your actual channel ID
const limit = 50;

let cursor: string | null = null;

/**
* @usage NEYNAR_API_KEY=<YOUR_API_KEY> npx ts-node --transpile-only index.ts
*/
async function fetchMembers() {
	const results = []; // Array to store all fetched members

	do {

		try {
			const url = `https://api.neynar.com/v2/farcaster/channel/member/list?channel_id=${channelId}&limit=${limit}${cursor ? `&cursor=${cursor}` : ''}`;
			const options = {
				method: 'GET',
				headers: { accept: 'application/json', api_key: API_KEY }
			};

			const data = await fetch(url, options)
				.then(res => res.json())
				.catch(err => console.error(err));

			results.push(...data.members.map((member: any) => {

				const verified_addresses = member.user.verified_addresses?.eth_addresses?.join(',');
				const x = member.user.verified_accounts?.find((o: any) => o.platform === 'x')?.username;

				return {
					fid: member.user.fid,
					username: member.user.username,
					display_name: member.user.display_name,
					custody_address: member.user.custody_address,
					bio: member.user.profile.bio.text.replace(/"/g, '""').replace(/\n/g, '\\n'),
					follower_count: member.user.follower_count,
					following_count: member.user.following_count,
					verified_addresses,
					x: x ? x.replace(/"/g, '""').replace(/\n/g, '\\n') : null,
					hasPowerBadge: member.user.power_badge,
				};
			}));

			cursor = data.next.cursor;


		} catch (err) {
			console.error(err);
			break; // Exit loop on error
		}
	} while (cursor); // Continue until there are no more pages

	console.log(results.length);
	console.log(JSON.stringify(results, null, 2));

	// Write results to a CSV file
	const csvWriter = createObjectCsvWriter({
		path: `${channelId}-members.csv`, // Specify the output CSV file path
		alwaysQuote: true,
		header: [
			{ id: 'fid', title: 'FID' },
			{ id: 'username', title: 'Username' },
			{ id: 'display_name', title: 'Display Name' },
			{ id: 'custody_address', title: 'Custody Address' },
			{ id: 'bio', title: 'Bio' },
			{ id: 'follower_count', title: 'Follower Count' },
			{ id: 'following_count', title: 'Following Count' },
			{ id: 'verified_addresses', title: 'Verified Addresses' },
			{ id: 'x', title: 'X' },
			{ id: 'hasPowerBadge', title: 'Has Power Badge' },
		],
	});

	await csvWriter.writeRecords(results); // Write records to CSV
	console.log(`${results.length} members written to ${channelId}-members.csv`);
}

fetchMembers();

tsconfig.json

{
    "compilerOptions": {
        "module": "NodeNext",
        "moduleResolution": "NodeNext",
    }
}