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diwushennian4955
diwushennian4955

Posted on • Originally published at nexa-api.com

RocketChat Gets a Markdown Viewer — Now Generate Your Markdown Content with AI (API Tutorial)

#markdown #documentation #ai #github

RocketChat just shipped something interesting: a GitHub-flavored markdown viewer in their Electron desktop client. The PR adds marked with GFM support, highlight.js for syntax highlighting, and DOMPurify for XSS sanitization — so .md files now render beautifully inside RocketChat.

It's a small feature. But it signals something bigger: developers love markdown, and they want richer markdown experiences everywhere.

Which got me thinking: what if you could use AI to auto-generate the visual assets inside your markdown files?

The Problem with README Files

Every good GitHub README needs visuals:

  • A hero banner (1280×640) that communicates the project's purpose
  • A project logo (512×512) for brand identity
  • Architecture diagrams showing how components connect
  • Social preview images for link sharing on Twitter/LinkedIn

Creating these manually means hours in Figma or $50–200 outsourced. For most open-source projects and indie hackers, that's not realistic.

The result? Most READMEs look like this:

# my-project
A tool that does stuff.
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No banner. No logo. No visual context. Just text.

The Solution: AI Image Generation via API

NexaAPI gives you access to 56+ AI models — including FLUX Schnell, FLUX Dev, and FLUX Pro — at the lowest prices in the market. You can generate professional README visuals programmatically and embed them directly in your markdown.

Cost: ~$0.003 per image. Generate 100 assets for under $0.30.

Python Example 

# Install: pip install nexaapi
from nexaapi import NexaAPI

client = NexaAPI(api_key='YOUR_API_KEY')

# Generate a professional README banner image for your GitHub project
response = client.images.generate(
    model='flux-schnell',  # or latest available model on NexaAPI
    prompt='Professional GitHub repository banner, dark theme, clean modern design, developer tools, markdown documentation, tech aesthetic',
    width=1280,
    height=640
)

# Save the image to embed in your markdown file
image_url = response.data[0].url
print(f'Embed in README.md: ![Banner]({image_url})')

# Generate a project logo
logo_response = client.images.generate(
    model='flux-schnell',
    prompt='Minimalist software project logo, clean vector style, blue and white, professional developer tool icon',
    width=512,
    height=512
)
print(f'Project logo URL: {logo_response.data[0].url}')
print(f'Cost: ~$0.003 per image — generate 100s of doc assets for under $1')
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JavaScript Example 

// Install: npm install nexaapi
import NexaAPI from 'nexaapi';

const client = new NexaAPI({ apiKey: 'YOUR_API_KEY' });

async function generateMarkdownAssets() {
  // Generate README hero banner
  const bannerResponse = await client.images.generate({
    model: 'flux-schnell',
    prompt: 'Professional GitHub repository banner, dark theme, clean modern design, developer documentation, markdown viewer, tech aesthetic',
    width: 1280,
    height: 640
  });

  const bannerUrl = bannerResponse.data[0].url;
  console.log(`Add to your README.md:\n![Project Banner](${bannerUrl})`);

  // Generate architecture diagram illustration
  const diagramResponse = await client.images.generate({
    model: 'flux-schnell',
    prompt: 'Clean software architecture diagram illustration, flowchart style, blue and white, professional technical documentation graphic',
    width: 1024,
    height: 768
  });

  console.log(`Architecture diagram: ${diagramResponse.data[0].url}`);
  console.log('Cost: $0.003/image — cheapest AI image API available');
}

generateMarkdownAssets();
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Manual vs AI: The Real Cost Comparison

Task Manual AI with NexaAPI
README hero banner 2h / $50 outsourced $0.003, instant
Project logo 4h / $100 outsourced $0.003, instant
Architecture diagram 1h / $30 outsourced $0.003, instant
Social preview 1h / $20 outsourced $0.003, instant
Total (4 assets) 8h+ / $200 $0.012 / ~10 seconds

API Pricing Comparison

Provider FLUX Schnell FLUX Dev FLUX Pro
NexaAPI $0.001/img $0.01/img $0.02/img
Replicate $0.003/img $0.025/img $0.04/img
fal.ai $0.003/img $0.025/img $0.05/img

NexaAPI is 50–70% cheaper than alternatives, with no cold starts.

Get Started

  1. Sign up at nexa-api.com — $5 free credits, no credit card required
  2. Try on RapidAPI: rapidapi.com/user/nexaquency
  3. Install Python SDK: pip install nexaapi — PyPI
  4. Install Node.js SDK: npm install nexaapi — npm

Inspired by RocketChat's markdown viewer PR. Markdown is everywhere — your docs deserve better visuals.

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