hurl/docs/filters.md

Filters

Definition

Captures and asserts share a common structure: query. A query is used to extract data from an HTTP response; this data can come from the HTTP response body, the HTTP response headers or from the HTTP meta-informations (like duration for instance)...

In this example, the query jsonpath "$.books[0].name" is used in a capture to save data and in an assert to test the HTTP response body.

Capture:

namevariable : jsonpath "$.books[0].name"query

Assert:

jsonpath "$.books[0].name"query == "Dune"predicate

In both case, the query is exactly the same: queries are the core structure of asserts and captures. Sometimes, you want to process data extracted by queries: that's the purpose of filters.

Filters are used to transform value extracted by a query and can be used in asserts and captures to refine data. Filters can be chained, allowing for fine-grained data extraction.

jsonpath "$.name"query split "," nth 02 filters == "Herbert"predicate

Example

GET https://example.org/api

HTTP 200
[Captures]
name: jsonpath "$user.id" replace /\d/ "x"
[Asserts]
header "x-servers" split "," count == 2
header "x-servers" split "," nth 0 == "rec1"
header "x-servers" split "," nth 1 == "rec3"
jsonpath "$.books" count == 12

Description

count

Counts the number of items in a collection.

GET https://example.org/api

HTTP 200
[Asserts]
jsonpath "$.books" count == 12

daysAfterNow

Returns the number of days between now and a date in the future.

GET https://example.org

HTTP 200
[Asserts]
certificate "Expire-Date" daysAfterNow > 15

daysBeforeNow

Returns the number of days between now and a date in the past.

GET https://example.org

HTTP 200
[Asserts]
certificate "Start-Date" daysBeforeNow < 100

decode

Decode bytes to string using encoding.

# The 'Content-Type' HTTP response header does not precise the charset 'gb2312'
# so body must be decoded explicitly by Hurl before processing any text based assert
GET https://exapple.org/hello_china

HTTP 200
[Asserts]
header "Content-Type" == "text/html"
# Content-Type has no encoding clue, we must decode ourselves the body response.
bytes decode "gb2312" xpath "string(//body)" == "你好世界"

format

Formats a date to a string given a specification format.

GET https://example.org

HTTP 200
[Asserts]
cookie "LSID[Expires]" format "%a, %d %b %Y %H:%M:%S" == "Wed, 13 Jan 2021 22:23:01"

htmlEscape

Converts the characters &, < and > to HTML-safe sequence.

GET https://example.org/api

HTTP 200
[Asserts]
jsonpath "$.text" htmlEscape == "a > b"

htmlUnescape

Converts all named and numeric character references (e.g. >, >, >) to the corresponding Unicode characters.

GET https://example.org/api

HTTP 200
[Asserts]
jsonpath "$.escaped_html[1]" htmlUnescape == "Foo © bar 𝌆"

nth

Returns the element from a collection at a zero-based index.

GET https://example.org/api

HTTP 200
[Asserts]
jsonpath "$.books" nth 2 == "Children of Dune"

regex

Extracts regex capture group. Pattern must have at least one capture group.

GET https://example.org/foo

HTTP 200
[Captures]
param1: header "header1"
param2: header "header2" regex "Hello (.*)!"
param3: header "header2" regex /Hello (.*)!/

replace

Replaces all occurrences of old string with new string.

GET https://example.org/foo

HTTP 200
[Captures]
url: jsonpath "$.url" replace "http://" "https://"
[Asserts]
jsonpath "$.ips" replace ", " "|" == "192.168.2.1|10.0.0.20|10.0.0.10"

split

Splits to a list of strings around occurrences of the specified delimiter.

GET https://example.org/foo

HTTP 200
[Asserts]
jsonpath "$.ips" split ", " count == 3

toDate

Converts a string to a date given a specification format.

GET https:///example.org

HTTP 200
[Asserts]
header "Expires" toDate "%a, %d %b %Y %H:%M:%S GMT" daysBeforeNow > 1000

ISO 8601 / RFC 3339 date and time format have shorthand format %+:

GET https://example.org/api/books

HTTP 200
[Asserts]
jsonpath "$.published" == "2023-01-23T18:25:43.511Z"
jsonpath "$.published" toDate "%Y-%m-%dT%H:%M:%S%.fZ" format "%A" == "Monday"
jsonpath "$.published" toDate "%+" format "%A" == "Monday" # %+ can be used to parse ISO 8601 / RFC 3339

toInt

Converts to integer number.

GET https://example.org/foo

HTTP 200
[Asserts]
jsonpath "$.id" toInt == 123

urlDecode

Replaces %xx escapes with their single-character equivalent.

GET https://example.org/foo

HTTP 200
[Asserts]
jsonpath "$.encoded_url" urlDecode == "https://mozilla.org/?x=шеллы"

urlEncode

Percent-encodes all the characters which are not included in unreserved chars (see RFC3986) with the exception of forward slash (/).

GET https://example.org/foo

HTTP 200
[Asserts]
jsonpath "$.url" urlEncode == "https%3A//mozilla.org/%3Fx%3D%D1%88%D0%B5%D0%BB%D0%BB%D1%8B"

xpath

Evaluates a XPath expression.

GET https://example.org/hello_gb2312

HTTP 200
[Asserts]
bytes decode "gb2312" xpath "string(//body)" == "你好世界"