🌐 EPL Online Playground¶

Try EPL directly in your browser — no installation required.

Can't see the playground?

Assistant Routing¶

The browser playground loads the published eplang runtime in Pyodide, runs parser-backed AST diagnostics, and supports explicit assistant routing:

Secure Proxy for a same-origin /chat endpoint or a Cloudflare Worker URL
Groq API for direct browser requests with your own Groq key
Gemini API for direct browser requests with your own Gemini key

The page no longer uses an anonymous third-party fallback. You decide exactly where assistant traffic goes. For public deployments, prefer Secure Proxy mode so private Groq/Gemini keys are not stored in a public browser page.

For the full local playground server with isolated code execution and /api/assist, run:

epl playground

Example Snippets¶

Try pasting these into the playground:

Hello World¶

Say "Hello from EPL!"

Variables & Math¶

x = 10
y = 20
Say "Sum: " + to_string(x + y)

Functions¶

Function factorial takes n
    If n is less than 2 then
        Return 1
    End
    Return n * factorial(n - 1)
End

Say "10! = " + to_string(factorial(10))

Lists & Loops¶

names = ["Alice", "Bob", "Charlie"]
For Each name in names
    Say "Hello, " + name + "!"
End

Web App with Observability¶

Create WebApp called app

Import "epl.observability" As obs
obs.attach(app)

Route "/" shows
    Page "EPL App"
        Heading "Hello from EPL!"
        Text "Monitoring: /_health | /_ready | /_metrics"
    End
End

Start app on port 8000

JavaScript Bridge¶

Use javascript "lodash" as _
Say _.capitalize("hello from epl")
Say _.shuffle([1, 2, 3, 4, 5])

3D Scene¶

3D scene syntax is still evolving. For now, use the playground primarily for parser-backed core EPL, web examples, and JavaScript bridge experiments, and treat 3D snippets as experimental until they are covered by parser-verified docs examples.

Features¶

AST-Aware Analysis — Real-time error detection with gutter markers
AI Copilot — Multi-provider support (Secure Proxy, Groq, Gemini) with code injection
Thinking Mode — Complex queries show reasoning process before generating code
Full EPL Support — All language features including web apps, 3D/canvas, style/layout, and JS bridge