Custom logic with Code (JS)

Run a snippet of JavaScript in a sandbox to compute, validate or branch.

When a flow needs logic that blocks can’t express, drop in a Code (JS) block. It runs a small JavaScript snippet in a sandbox and can read/write your variables.

What the snippet can access

• vars — read and write your variables. Assigning vars.x = … saves it for later blocks/messages.
• user — read-only user fields (user.id, user.first_name, …).
• return true / return false — choose the outcome: true → ok, false/throw → error.

// Give a 10% discount to users with 100+ points
if (Number(vars.points) >= 100) {
  vars.discount = "10";
  return true;   // → ok
}
vars.discount = "0";
return false;    // → error

Outcomes

ok when the snippet returns truthy; error when it returns falsy or throws. Wire both to keep the flow predictable.