Expressions

Write dynamic expressions to transform data, make comparisons, and build logic in your workflows

Expressions let you go beyond simple variable references. Use them to transform data, compare values, and build dynamic logic.

Static vs Dynamic Mode

Most fields in Flint have two modes:

Static Fixed value, like Hello World
Dynamic Expression that evaluates at runtime, like "Hello " + trigger.name

Click the toggle next to any field to switch between modes.

When to Use Dynamic Mode

Use dynamic mode when you need to combine values, do math, compare things, or conditionally change output.

Expressions use a simple, readable syntax.

Reference data from the trigger or previous steps:

trigger.customer_name
steps.extract_invoice.total
steps.api_call.response.status

Concatenate strings with +:

"Order #" + trigger.order_id + " is ready"
"Hello, " + trigger.customer.first_name + "!"

Standard math operators work as expected:

steps.extract.quantity * steps.extract.unit_price
steps.subtotal + steps.tax
trigger.amount / 100
steps.total - steps.discount

Build conditions using comparison operators:

Examples:

steps.extract.amount > 1000
trigger.status == "approved"
steps.count != 0

Combine conditions with && (and) and || (or):

steps.amount > 1000 && trigger.is_priority
trigger.type == "urgent" || trigger.type == "critical"

Use ! for negation:

!steps.is_duplicate
!(trigger.amount < 100)

Access items by index (starting at 0):

trigger.items[0]
trigger.items[0].name
steps.extract.line_items[2].price

Check if something is in a list:

"admin" in trigger.user.roles
trigger.category in ["electronics", "appliances", "furniture"]

Get the size of a list:

size(trigger.items)
trigger.items.size() > 0

Access nested properties with dots:

trigger.customer.address.city
steps.response.data.results[0].id

Check if a property exists:

has(trigger.customer.phone)

Convert between types when needed:

int(trigger.quantity)
double(steps.price)
string(steps.order_number)

Choose between values based on a condition:

trigger.amount > 1000 ? "High Priority" : "Normal"

Nested conditions:

trigger.type == "urgent" ? "🔴" : trigger.type == "normal" ? "🟡" : "⚪"

Use a fallback if something might be empty:

trigger.company_name != "" ? trigger.company_name : "Unknown Company"

"https://api.example.com/orders/" + string(trigger.order_id) + "/details"

"$" + string(steps.extract.total)

trigger.amount > 5000 && trigger.is_new_customer && !has(trigger.manager_approved)