PostNitro Carousel Generator

Generate social media carousel posts via the PostNitro.ai Embed API. Two workflows: AI generation (topic/article/X post → carousel) and content import (your own slides, with optional infographics).

Setup

1. Sign up at https://postnitro.ai (free plan: 5 credits/month)
2. Go to account settings → "Embed" → generate an API key
3. Set up your template, brand, and AI preset in the PostNitro dashboard
4. Set environment variables:

   export POSTNITRO_API_KEY="your-api-key"
   export POSTNITRO_TEMPLATE_ID="your-template-id"
   export POSTNITRO_BRAND_ID="your-brand-id"
   export POSTNITRO_PRESET_ID="your-ai-preset-id"
   

Base URL: https://embed-api.postnitro.ai Auth header: embed-api-key: $POSTNITRO_API_KEY

Core Workflow

All carousel creation is asynchronous: Initiate → Poll Status → Get Output.

1. Generate a carousel with AI

curl -X POST 'https://embed-api.postnitro.ai/post/initiate/generate' \
  -H 'Content-Type: application/json' \
  -H "embed-api-key: $POSTNITRO_API_KEY" \
  -d '{
    "postType": "CAROUSEL",
    "templateId": "'"$POSTNITRO_TEMPLATE_ID"'",
    "brandId": "'"$POSTNITRO_BRAND_ID"'",
    "presetId": "'"$POSTNITRO_PRESET_ID"'",
    "responseType": "PNG",
    "aiGeneration": {
      "type": "text",
      "context": "5 tips for growing your LinkedIn audience in 2026",
      "instructions": "Professional tone, actionable advice"
    }
  }'

Returns { "success": true, "data": { "embedPostId": "post123", "status": "PENDING" } }. Save the embedPostId.

aiGeneration.type values:

• "text" — context is the text content to turn into a carousel
• "article" — context is an article URL to extract and convert
• "x" — context is an X (Twitter) post or thread URL

See examples/generate-from-text.json, examples/generate-from-article.json, and examples/generate-from-x-post.json.

2. Import your own slide content

curl -X POST 'https://embed-api.postnitro.ai/post/initiate/import' \
  -H 'Content-Type: application/json' \
  -H "embed-api-key: $POSTNITRO_API_KEY" \
  -d '{
    "postType": "CAROUSEL",
    "templateId": "'"$POSTNITRO_TEMPLATE_ID"'",
    "brandId": "'"$POSTNITRO_BRAND_ID"'",
    "responseType": "PNG",
    "slides": [
      { "type": "starting_slide", "heading": "Your Title", "description": "Intro text" },
      { "type": "body_slide", "heading": "Key Point", "description": "Details here" },
      { "type": "ending_slide", "heading": "Take Action!", "cta_button": "Learn More" }
    ]
  }'

Returns same response format with embedPostId.

Slide rules:

• Exactly 1 starting_slide (required)
• At least 1 body_slide (required)
• Exactly 1 ending_slide (required)
• heading is required on every slide