Interactive Playground¶

Try Branchline in your browser with the interactive playground!

The playground lets you:

Load curated examples with pre-configured input data
Edit Branchline programs with syntax highlighting
Modify input JSON in real-time
Execute transforms directly in your browser
View trace explanations to understand program execution

All computation happens client-side using the Kotlin/JS-compiled Branchline interpreter.

Example Programs¶

Here are some sample Branchline programs you can try in the playground:

Basic Transform¶

LET fullName = msg.first_name + " " + msg.last_name;
LET loyalty = msg.loyalty_tier ?? "standard";

OUTPUT {
    id: msg.id,
    full_name: fullName,
    loyalty_tier: loyalty,
    shipping_city: msg.address.city
}

Array Processing¶

LET totalAmount = ARRAY_SUM(msg.items, x -> x.price * x.quantity);
LET itemCount = ARRAY_LENGTH(msg.items);

OUTPUT {
    order_id: msg.id,
    total_amount: totalAmount,
    item_count: itemCount,
    items: ARRAY_MAP(msg.items, item -> {
        name: item.name,
        subtotal: item.price * item.quantity
    })
}