Context is a special global data-type. Its structure is same as the JSON input received on the node. It uses the membership operator . to access its members.

Example

If following is received on the input:

{
  "customer": {
    "firstName": "John",
    "lastName": "Doe",
    "groups": ["admin", "user"],
    "age": 34
  }
}

We would be able to use the following properties globally:

customer.firstName; // "John"
customer.lastName; // "Doe"
customer.groups; // ["admin", "user"]
customer.age; // 34

To combine it with knowledge from previous sections, we can write expressions such as:

customer.firstName + " " + customer.lastName // "John Doe"
customer.age in [30..40] // true
contains(customer.groups, "admin") // true

📘

$ is also considered to be a part of context, and it refers to the current column (within a cell).