Posted on Jan 12

Building a Twitter OAuth Authentication Header Generator with Vercel Serverless Functions

Twitter API integration requires proper OAuth authentication. This guide demonstrates how to create a serverless function on Vercel that generates OAuth authentication headers for Twitter API requests.

Technical Stack Overview

Vercel Serverless Functions
oauth-1.0a library
Node.js crypto module
Edge Runtime

Implementation

Here's the complete serverless function implementation:

import OAuth from 'oauth-1.0a'; import crypto from 'crypto'; export const config = { runtime: 'edge', }; export default function handler(req) { const oauth = new OAuth({ consumer: { key: process.env.TWITTER_CONSUMER_KEY, secret: process.env.TWITTER_CONSUMER_SECRET }, signature_method: 'HMAC-SHA1', hash_function(baseString, key) { return crypto .createHmac('sha1', key) .update(baseString) .digest('base64'); } }); const requestData = { url: 'https://api.twitter.com/1.1/statuses/update.json', method: 'POST' }; const token = { key: process.env.TWITTER_ACCESS_TOKEN, secret: process.env.TWITTER_ACCESS_TOKEN_SECRET }; const authHeader = oauth.toHeader( oauth.authorize(requestData, token) ); return new Response( JSON.stringify(authHeader), { headers: { 'Content-Type': 'application/json', 'Cache-Control': 'no-store, max-age=0' } } ); }