If Condition step

The If Condition step runs the steps in its THEN branch when a condition is true, and the steps in its ELSE branch otherwise. It's how a Glue job makes decisions: skip a sale that doesn't qualify, treat VIPs differently, or handle a failed call.

Set it up

In the app	`data` field	What it does
If Condition	`condition`	A JavaScript expression with your variables on `$`, like `$.sale.total_price > 500`.
THEN branch	`steps`	Drag steps here. They run when the condition is exactly `true`.
ELSE branch	`else_steps`	Optional. Select Add else, then drag steps here. They run otherwise.

How the condition works

It must be exactly true. Anything else (false, "yes", 1, undefined) runs ELSE. Write $.send === true, not $.send.
Use JavaScript. ===, !==, >, <, &&, ||, ! and method calls all work: $.email && $.email.indexOf("@") > 0.
Use $, not Liquid. {{ name }} doesn't work in a condition.
An error stops the run. If the expression throws (for example, $.sale.total_price when $.sale is undefined), the job fails. Guard with $.sale && $.sale.total_price > 500.
It has 60 seconds, like a Script step.

Branches can hold any steps, including more If Conditions, as deep as you need (up to the nesting limit in Creating Glue integrations).

🚧
Steps in a branch run again on a retry
When a job is retried, API calls and emails inside an If Condition run again, even if they worked the first time. Keep writes inside a branch safe to repeat.

Example 1: Mark VIP customers

Trigger: System Hook, Update Customer.

Script: Read the customer

var p = JSON.parse($.default);
$.customer = p.after || p;
$.is_vip = ($.customer.total_spent || 0) > 1000;

If Condition: If VIP, Condition $.is_vip === true.
- THEN: Script: Mark them as VIP, $.tag = "vip"; followed by the steps that send it on.
- ELSE: Script: Mark them as regular, $.tag = "regular";.

Example 2: Log good payloads, email about bad ones

Trigger: Webhook.

Script: Read the payload

var body = {};
try { body = JSON.parse($.default); } catch (e) {}
$.should_log = typeof body.reference === "string" && body.reference !== "";
$.log_body = JSON.stringify({ category: "external_sales", message: "Sale " + body.reference });

If Condition: If the sale should be logged, Condition $.should_log === true.
- THEN: API Request: Create a log entry, POST /log.json, Body {{ log_body }}.
- ELSE: Email: Email the floor, to let someone know a bad payload came in.

Tips

Work it out in a script first. A condition like $.send_event === true, with the logic in the Script step before it, is easier to read and test than a long expression.
An empty THEN is fine while you build, but remember to drag your steps into it. A step below the If Condition at the top level runs whatever the condition says.
Log the decision. console.log("vip?", $.is_vip) in the script shows up in the Console when you select Run.

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