Some collections can be searched, based on the fields they include. You can include the X-Filter header to pass in JSON-formatted filter objects. For example, here's a request to list Linode types that use our standard class:

curl "https://api.linode.com/v4/linode/types" \
  -H 'X-Filter: { "class": "standard" }'

The filter's keys are from the object you're filtering, using that object's accepted values.

What's filterable

You can determine what's filterable in various ways:

Review the operation's response description. If a parameter is labeled as Filterable in its description in the RESPONSES section, you can include it in the X-Filter header.

Review the API specification. If a parameter is marked as x-linode-filterable: true in the API specification, it can be included in the X-Filter header.

Nested parameters and filtering

If a parameter is labeled as Filterable, but it exists as a child of another parameter, use dot notation to represent both the parent and child parameters. For example, lets say a parent parameter is resource and it has a child parameter type that's labeled as filterable:

"resource": {
    "id": 3456,
    "type": "widget", <== This can be filtered
 }

The call to filter on that parameter would look like this:

curl "https://api.linode.com/v4/linode/resources" \
  -H 'X-Filter: { "resource.type": "widget" }'

Filter operators

You can also add multiple filters by including more than one key. For example, here's how to filter for standard Linode types that offer one vcpu:

 curl "https://api.linode.com/v4/linode/types" \
  -H 'X-Filter: { "class": "standard", "vcpus": 1 }'

This filter automatically applies AND logic as a filter operator. So, all conditions need to be met to display a filtered response.

You can also set the response to display either Linode types using the standard class, or Linode types with one vcpu. In this case, you need to add the +or filter operator:

curl "https://api.linode.com/v4/linode/types" \
 -H 'X-Filter: { "+or": [ { "vcpus": 1 }, { "class": "standard" } ] }'

Each filter in the +or array is its own filter object, and all conditions in it use AND logic, as they were in the previous example.

Supported filter operators

Operators form the keys of a filter object. Their value needs to be of the appropriate type, and they're evaluated as follows:

OPERATOR	TYPE	DESCRIPTION
`+and`	array	All conditions need to be true.
`+or`	array	At least one condition needs to be true.
`+gt`	number	The value needs to be greater than the provided number.
`+gte`	number	The value needs to be greater than or equal to the provided number.
`+lt`	number	The value needs to be less than the provided number.
`+lte`	number	The value needs to be less than or equal to the provided number.
`+contains`	string	The provided string needs to be in the value.
`+neq`	string	The provided string is left out of the results.
`+order_by`	string	Order results based on the provided attribute. The attribute needs to be filterable.
`+order`	string	Sort in ascending (`asc`) or descending (`desc`) order. This defaults to `asc`. Requires `+order_by`.

Here's another example of listing Linode types and filtering the response to those with memory equal to or higher than 61440:

curl "https://api.linode.com/v4/linode/types" \
  -H '
    X-Filter: {
      "memory": {
        "+gte": 61440
      }
    }'

You can combine and nest operators to construct arbitrarily complex queries. This example uses the same operation to list all Linode types that are either standard or highmem class, or have between 12 and 20 VCPUs:

curl "https://api.linode.com/v4/linode/types" \
  -H '
    X-Filter: {
      "+or": [
        {
          "+or": [
            {
              "class": "standard"
            },
            {
              "class": "highmem"
            }
          ]
        },
        {
          "+and": [
            {
              "vcpus": {
                "+gte": 12
              }
            },
            {
              "vcpus": {
                "+lte": 20
              }
            }
          ]
        }
      ]
    }'