Ray So

ray.so Code Image Generation

Generate code snippet images by constructing a ray.so URL, navigating in Chrome via Playwriter, pressing Cmd+C to copy the rendered image to clipboard, and saving the clipboard to a file.

Always use the vercel theme unless the user specifies a different one.

URL structure

All settings live in the hash fragment (#key=value&key2=value2), not query params. Code is Base64url-encoded using Node.js Buffer.from(code).toString('base64url').

https://ray.so/#code=BASE64URL_CODE&theme=vercel&darkMode=true&background=true&padding=64&language=typescript&title=example.ts

Parameters

Workflow: generate and save a code image

Single Playwriter call. Use the script below exactly as-is, only changing the code, language, title, theme, and output path variables. Do not restructure, reorder, or simplify the script; the clipboard interceptor must be injected before Cmd+C is pressed, and the poll loop must run after.

playwriter -s <sessionId> --timeout 30000 -e "$(cat <<'PYEOF'
const code = `export function hello() {
  return "world"
}`
const encoded = Buffer.from(code).toString('base64url')
const params = new URLSearchParams()
params.set('code', encoded)
params.set('theme', 'vercel')
params.set('darkMode', 'true')
params.set('background', 'true')
params.set('padding', '64')
params.set('language', 'typescript')
params.set('title', 'hello.ts')

// Navigate (always fresh page)
state.page = await context.newPage()
await state.page.goto('https://ray.so/#' + params.toString(), { waitUntil: 'domcontentloaded' })
await state.page.waitForSelector('#frame', { timeout: 10000 })

// Intercept clipboard write to capture the PNG blob
await state.page.evaluate(() => {
  window.__clipboardBlob = null
  const origWrite = navigator.clipboard.write.bind(navigator.clipboard)
  navigator.clipboard.write = async (items) => {
    for (const item of items) {
      if (item.types.includes('image/png')) {
        window.__clipboardBlob = await item.getType('image/png')
      }
    }
    return origWrite(items)
  }
})

// Press Cmd+C and poll until the blob is captured (no fixed sleep)
await state.page.keyboard.press('Meta+c')
let attempts = 0
while (attempts < 50) {
  const hasBlob = await state.page.evaluate(() => !!window.__clipboardBlob)
  if (hasBlob) break
  await state.page.waitForTimeout(100)
  attempts++
}
if (attempts >= 50) throw new Error('Clipboard blob not captured after 5s')

// Read blob as base64 and save via Node.js fs
const base64 = await state.page.evaluate(async () => {
  const blob = window.__clipboardBlob
  const buf = await blob.arrayBuffer()
  const bytes = new Uint8Array(buf)
  let binary = ''
  for (let i = 0; i < bytes.length; i++) binary += String.fromCharCode(bytes[i])
  return btoa(binary)
})

const fs = require('node:fs')
const buffer = Buffer.from(base64, 'base64')
fs.writeFileSync('/absolute/path/to/output.png', buffer)
console.log('Saved', buffer.length, 'bytes')

// Close the page
await state.page.close()
PYEOF
)"

The clipboard poll checks every 100ms until the PNG blob is captured, with a 5s timeout. After saving, verify the output image with the read-media tool.

Agent rules

• Always use vercel theme unless the user asks for something else
• Always use darkMode=true, background=true, padding=64 by default
• Set language explicitly when known; do not rely on auto-detect
• Set title to the filename when available (e.g. greet.ts)
• Use absolute paths for the output PNG
• Do not use js-base64 npm package in Playwriter; use Buffer.from(code).toString('base64url') instead (Playwriter sandbox only allows Node.js built-ins)
• Do not inspect the page between navigate and Cmd+C; the URL params are deterministic
• After saving, verify the image with read-media tool to confirm it rendered correctly