Chapter 53. JQ

When using jq with Red Hat build of Camel Spring Boot, use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-jq-starter</artifactId>
</dependency>

The JQ language supports 4 options, which are listed below.

For example, you can use JQ in a Predicate with the Content Based Router EIP.

from("queue:books.new")
  .choice()
    .when().jq(".store.book.price < 10)")
      .to("jms:queue:book.cheap")
    .when().jq(".store.book.price < 30)")
      .to("jms:queue:book.average")
    .otherwise()
      .to("jms:queue:book.expensive");

Camel JQ leverages camel-jackson for type conversion. To enable camel-jackson POJO type conversion, refer to the Camel Jackson documentation.

By default, JQ uses the message body as the input source. However, you can also use a header as input by specifying the headerName option.

For example to count the number of books from a JSON document that was stored in a header named books you can do:

from("direct:start")
    .setHeader("numberOfBooks")
        .jq(".store.books | length", int.class, "books")
    .to("mock:result");

The camel-jq adds the following functions:

For example, to set the property foo with the value from the Message header `MyHeader':

from("direct:start")
    .transform()
        .jq(".foo = header(\"MyHeader\")")
    .to("mock:result");

The component supports 4 options, which are listed below.