JavaScript

Since Camel 3.20

Camel allows JavaScript to be used as an Expression or Predicate in Camel routes.

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

JavaScript Options

The JavaScript language supports the following options which are listed below.

Name Default Java Type Description

Name	Default	Java Type	Description
resultType (common)		`String`	The class of the result type (type from output).
trim (advanced)	`true`	`Boolean`	Whether to trim the source code to remove leading and trailing whitespaces and line breaks.

resultType (common)

String

The class of the result type (type from output).

trim (advanced)

true

Boolean

Whether to trim the source code to remove leading and trailing whitespaces and line breaks.

Variables

Variable	Type	Description
this	Exchange	the Exchange is the root object
context	CamelContext	the CamelContext
exchange	Exchange	the Exchange
exchangeId	String	the exchange id
message	Message	the message
body	Message	the message body
headers	Map	the message headers
properties	Map	the exchange properties

Variable

Type

Description

this

Exchange

the Exchange is the root object

context

CamelContext

the CamelContext

exchange

Exchange

the Exchange

exchangeId

String

the exchange id

message

Message

the message

body

Message

the message body

headers

Map

the message headers

properties

Map

the exchange properties

Dependencies

To use JavaScript in your Camel routes, you need to add the dependency on camel-javascript , which implements the JavaScript language (JavaScript with GraalVM).

If you use Maven, you could add the following to your pom.xml, substituting the version number for the latest & greatest release.

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-javascript</artifactId>
  <version>x.x.x</version>
</dependency>