How to Integrate Buffer with V0

Start in V0 and describe the social media publishing interface you need. A good starting composition widget should include a post text area with character count indicators for different platforms (Twitter is 280 characters, LinkedIn is 3,000, Instagram captions have no meaningful limit), platform selection checkboxes with social network icons, a datetime picker for scheduling, a media attachment area, and submit buttons for 'Schedule' and 'Post Now'. V0 will generate a clean React component using Tailwind CSS with proper form validation. Ask for a queue sidebar that shows upcoming scheduled posts as a vertical timeline with platform icons and scheduled times. Request platform-specific preview sections so users can see how the post appears on Twitter versus LinkedIn formatting. Make sure V0 adds proper loading states on the submit buttons while the Buffer API call processes. Ask for a success toast notification after a post is added to the queue. Include error handling UI for when post submission fails — V0 can generate a red error banner component.

Buffer uses OAuth 2.0 for API authentication. To get an access token, register a new application at buffer.com/developers/apps. Fill in your app name and the callback URL (your Vercel deployment URL plus /api/buffer/callback). Once your app is registered, you receive a Client ID and Client Secret. Buffer's OAuth flow follows the standard authorization code pattern: redirect users to https://bufferapp.com/oauth2/authorize with your client_id and redirect_uri, receive the code callback, then exchange it for an access token at https://api.bufferapp.com/1/oauth2/token.json. For personal use or a single-account integration, you can use Buffer's simpler approach: generate a token directly in the Buffer Developer portal by visiting the developer tools section. This gives you a permanent access token without building a full OAuth flow. The token grants access to all Buffer functionality for the account that generated it. For multi-user tools where each user connects their own Buffer account, implement the full OAuth redirect flow.

Create Next.js App Router route handlers under app/api/buffer/. Start with a profiles route that fetches the user's connected social media profiles — you need the profile IDs to add posts to specific networks. Then create a queue route for fetching pending posts, and an update route for creating new posts. The Buffer API uses the base URL https://api.bufferapp.com/1/ and authenticates via a Bearer token in the Authorization header. The profiles endpoint GET /profiles.json returns an array of profile objects with id, service (twitter, linkedin, facebook, instagram), username, and avatar. The pending queue GET /profiles/{profile_id}/updates/pending.json returns upcoming scheduled posts for one profile. To create a post, POST to /updates/create.json with profile_ids (array of profile IDs), text (post content), scheduled_at (Unix timestamp or 'now'), and media object for images. The Buffer API returns update objects with id, status, text, scheduled_at, and profile_id. Your frontend uses profile IDs to reference which networks each post should go to.

1// app/api/buffer/queue/route.ts
2import { NextRequest, NextResponse } from 'next/server';
3
4const BUFFER_API = 'https://api.bufferapp.com/1';
5
6function getHeaders() {
7  return {
8    'Authorization': `Bearer ${process.env.BUFFER_ACCESS_TOKEN}`,
9    'Content-Type': 'application/json',
10  };
11}
12
13export async function GET(request: NextRequest) {
14  const profileId = request.nextUrl.searchParams.get('profileId');
15
16  try {
17    if (!profileId) {
18      // If no profile specified, fetch all profiles first
19      const profilesResponse = await fetch(`${BUFFER_API}/profiles.json`, {
20        headers: getHeaders(),
21        next: { revalidate: 300 },
22      });
23      const profiles = await profilesResponse.json();
24      return NextResponse.json({ profiles });
25    }
26
27    const queueResponse = await fetch(
28      `${BUFFER_API}/profiles/${profileId}/updates/pending.json`,
29      { headers: getHeaders(), next: { revalidate: 60 } }
30    );
31
32    if (!queueResponse.ok) {
33      return NextResponse.json(
34        { error: `Buffer API error: ${queueResponse.status}` },
35        { status: queueResponse.status }
36      );
37    }
38
39    const queueData = await queueResponse.json();
40    return NextResponse.json({
41      updates: queueData.updates,
42      total: queueData.total,
43    });
44  } catch (error) {
45    console.error('Buffer queue error:', error);
46    return NextResponse.json({ error: 'Failed to fetch Buffer queue' }, { status: 500 });
47  }
48}
49
50// app/api/buffer/update/route.ts (POST handler for creating posts)
51export async function POST_update(request: NextRequest) {
52  try {
53    const body = await request.json();
54    const { text, profileIds, scheduledAt, media } = body;
55
56    const payload: Record<string, unknown> = {
57      text,
58      profile_ids: profileIds,
59    };
60
61    if (scheduledAt) {
62      payload.scheduled_at = scheduledAt;
63    } else {
64      payload.now = false; // Add to queue at optimal time
65    }
66
67    if (media?.photo) {
68      payload.media = { photo: media.photo, thumbnail: media.photo };
69    }
70
71    const response = await fetch(`${BUFFER_API}/updates/create.json`, {
72      method: 'POST',
73      headers: getHeaders(),
74      body: JSON.stringify(payload),
75    });
76
77    const result = await response.json();
78
79    if (!response.ok) {
80      return NextResponse.json(
81        { error: result.error || 'Failed to create post' },
82        { status: response.status }
83      );
84    }
85
86    return NextResponse.json({ success: true, updates: result.updates });
87  } catch (error) {
88    console.error('Buffer create post error:', error);
89    return NextResponse.json({ error: 'Post creation failed' }, { status: 500 });
90  }
91}

In the Vercel Dashboard, go to your project and click Settings → Environment Variables. Add BUFFER_ACCESS_TOKEN with your Buffer API access token. Do not add the NEXT_PUBLIC_ prefix — this variable is used only in server-side route handlers. Set the variable for Production, Preview, and Development scopes. After adding the variable, redeploy your project. Now connect the V0-generated UI to the API routes. The component should fetch available profiles from /api/buffer/queue (without a profileId parameter) on mount to populate the profile selector checkboxes. Each checkbox should display the platform name and the connected account username. When the user fills in the post composer and clicks 'Add to Queue', the submit handler calls POST /api/buffer/update with the post text, selected profile IDs array, and optional scheduled_at timestamp. On success, clear the text area, show a success toast, and refresh the queue sidebar. On error, show the error message in a red banner and keep the post content so the user can retry. For the queue sidebar, poll /api/buffer/queue?profileId={id} every 5 minutes or on post submission to keep the displayed queue current.