CrossPoster

You can try CrossPoster right now at crossposter.llamaindex.ai!

CrossPoster is a tool for quickly posting to multiple social media platforms while adapting the content to each platform. It uses LlamaIndex.TS to identify entities within each post and @-mention them appropriately on each platform, and also to shorten the text for platforms with character limits.

It was designed as an internal tool for LlamaIndex and has been open-sourced because it's pretty nifty! But unless you have <b>exactly</b> our social media posting workflow you're probably going to have to do some work to adapt it. Why not contribute your changes back as PRs?

Tech Stack

• This is a pretty standard Next.js app.
• It uses LlamaIndex.TS for the AI logic.
• Web search is done with SerpAPI.
• It is deployed on Render because the serverless functions generated are bigger than Vercel's 250MB limit.

Getting Started

Local dev is straightforward:

npm install
npm run dev

Open http://localhost:3000 with your browser to see the result.

Environment variables

Because it connects to so many different APIs, there are a lot of environment variables. You can set them in a .env file in the root directory. They are:

• BASE_URL: The URL you intend to serve the app from; localhost:3000 in dev
• NEXTAUTH_URL: Same as base URL, used by the oauth library
• NEXTAUTH_SECRET: A random string of your choosing; used by the oauth library
• DATABASE_URL: Users and their access tokens are stored in a Postgres database. You can find the schema in prisma/schema.prisma.
• ANTHROPIC_API_KEY: Anthropic's Sonnet 3.5 does all of the thinking. It also works with OpenAI's GPT-4o and better models.
• SERP_API_KEY: Needed for the web searches
• GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET: Used for the OAuth flow
• TWITTER_OAUTH_1_KEY and TWITTER_OAUTH_1_SECRET: You can only upload images to Twitter's API using OAuth 1.0a so you have to set up an app that has those.
• LINKEDIN_CLIENT_ID and LINKEDIN_CLIENT_SECRET: You need a LinkedIn app with a bewildering array of permissions, including:
  • profile
  • email
  • openid
  • w_member_social
  • w_organization_social

PR ideas

Want to contribute? There are so many ways this could be better!

• Mastodon support (please!)
• Threads support
• Make the UI prettier
• Schedule posts and show them in a calendar (very large)