Assertions

Assertions allow you to declaratively write tests without writing any code.

Getting Started

1. Open a request and click on the Assert tab
2. Add assertions by specifying:
   • Expression: The value to test (e.g., res.status, res.body.id)
   • Operator: The comparison operator
   • Value: The expected value

Common Examples

Basic Response Testing

Expression	Operator	Value
res.status	equals	200
res.body.status	equals	success
res.body.message	contains	created
res.body.id	isNotEmpty

Nested Objects

{
  "user": {
    "profile": {
      "name": "John",
      "email": "john@example.com"
    }
  }
}

Expression	Operator	Value
res.body.user.profile.name	equals	John
res.body.user.profile.email	contains	@example.com

Arrays

{
  "users": [
    { "id": 1, "name": "Alice" },
    { "id": 2, "name": "Bob" }
  ]
}

Expression	Operator	Value
res.body.users	isNotEmpty
res.body.users[0].name	equals	Alice
res.body.users[1].id	equals	2

Using res() Query

For complex nested data, use the res() function:

{
  "order": {
    "items": [
      { "id": 1, "price": 29.99 },
      { "id": 2, "price": 69.99 }
    ]
  }
}

Expression	Operator	Value
res('order.items[0].price')	equals	29.99
res('..price')	isNotEmpty

Learn more about res() in Response Query docs.

Response Headers

Expression	Operator	Value
res.headers['content-type']	contains	application/json

Response Time

Expression	Operator	Value
res.responseTime	lt	1000

Available Operators

• Comparison: equals, notEquals, gt, gte, lt, lte
• String: contains, notContains, startsWith, endsWith, matches, notMatches
• Type Checks: isNull, isNotEmpty, isEmpty, isDefined, isUndefined
• Value Checks: isTruthy, isFalsy, isNumber, isString, isBoolean, isArray, isJson
• Other: in, notIn, between, length

Advanced Testing

For complex test scenarios with custom logic, use Test Scripts with JavaScript and Chai assertions.