ASSERTS

Expression-based checks for response or error data.

When to use

• Prefer for resilient checks that survive minor payload changes
• Use alone or with RESPONSE with_asserts / ERROR with_asserts

Minimal example

--- ASSERTS ---
.status == "ok"
@len(.items) > 0
@has_header("x-request-id")

Type annotations

When the type of a field is unknown, annotate it with :type to allow ordering operators:

--- ASSERTS ---
.price:number >= 0
.name:string contains "hello"

Variables from EXTRACT

Use $name to reference extracted variables — their type propagates automatically:

--- ASSERTS ---
$price >= 0            # type from EXTRACT
$name:string contains "hello"

Rules

• Each line is evaluated as a boolean expression
• Start with high-signal checks first (status, IDs, required fields)

Related

• Assertions API Reference
• EXTRACT section