Strudel API

Talk to the REPL at http://localhost:3000.

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Endpoints

Endpoint	Method	What it does
/api/code	POST	Push new code
/api/code	GET	Read current code
/api/play	POST	Start playback
/api/stop	POST	Stop playback
/api/status	GET	Get current state
/api/events	GET	SSE stream (real-time updates)

Real-time sync: The browser connects to /api/events via Server-Sent Events. When you push code or trigger play/stop, the browser updates automatically.

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Push Code

curl -X POST http://localhost:3000/api/code \
  -H "Content-Type: application/json" \
  -d '{"code": "YOUR_CODE_HERE"}'

JSON Escaping Rules (CRITICAL)

The API uses JSON.parse(). Invalid escape sequences will cause 500 errors.

Valid JSON escapes (these work):

Escape	Meaning
\"	Double quote
\\	Backslash
\n	Newline
\t	Tab
\r	Carriage return
\/	Forward slash

Invalid escapes (these BREAK the API):

• \x, \a, \s, \d, \w, or any backslash + letter not in the table above
• Unescaped backslashes

Examples:

# ✅ GOOD - properly escaped
curl -X POST http://localhost:3000/api/code \
  -H "Content-Type: application/json" \
  -d '{"code": "$: s(\"bd sd hh hh\")"}'

# ❌ BAD - \s is not a valid JSON escape
curl -X POST http://localhost:3000/api/code \
  -H "Content-Type: application/json" \
  -d '{"code": "$: s(\"bd\sd\")"}'

Rule of thumb: If you need a literal backslash in the code, escape it as \\

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Play / Stop

curl -X POST http://localhost:3000/api/play
curl -X POST http://localhost:3000/api/stop

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Typical Flow

1. Push code
2. Play

That's it. The REPL handles the rest.

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Multi-line Example

curl -X POST http://localhost:3000/api/code \
  -H "Content-Type: application/json" \
  -d '{"code": "setcpm(130/4)\n\n$: s(\"bd*4, hh*8\").bank(\"RolandTR909\")\n\n$: note(\"<c2 g1 ab1 bb1>\").s(\"sawtooth\").lpf(400)"}'