10 Quick Dataweave Functions

This quick reference collects many Dataweave functions for MuleSoft in one place, like reversing strings and flattening and trimming a payload.

Satheesh Kumar

Jun. 06, 17 · Opinion

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Since Dataweave is new in MuleSoft, it's hard to identify how to do some basic functions like substring reversing a string. This guide will provide all the functions in one place, which saves developers time. Below is the JSON I am using as a sample payload.

{
"firstName":"satheesh",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}

1. Substring

Most of us need to use substring somewhere in Dataweave, and it's very simple.We have to use the range operator the range can be mentioned as in array.

firstName: payload.firstName[0..3] will give you "firstName": "sath."

2. Reverse a String

Reversing a string is made very easy in Dataweave, so when you have a palindrome or not program next time, you don't need to use Java. You can use it directly in Dataweave.

firstName: payload.firstName[-1..0] will give you "firstName": "hseehtas."

3. Replace

To replace a string with another, the replace function is used.

firstName: (payload.firstName replace "s" with "new") will give you "firstName": "newatheenewh."

4. Identify the Size of the String

To identify the size of any value, the size of operator is used. It's not only for strings- it's for measuring arrays or lists, too.

sizeOfFirstName: sizeOf payload.firstName will give you "sizeOfFirstName": 8.

5. Concat

Concatenation is made very easy in Dataweave; it can be done by just using + operator .

Name: payload.firstName ++ " " ++ payload.lastName will give you "Name": "satheesh Kumar."

6. Trim

Trimming unwanted spaces is always required in integrations.

When the first name is " satheesh," use Name: trim payload.firstName and it will give you "Name": "satheesh."

7. Other String Operations

I don't need to explain this as the example says everything.

Input	Function	Sample	Result
satheesh	capitalize	Name: capitalize payload.firstName	Name:Satheesh
satheesh_mule_developer	camelize	Name: camelize payload.firstName	satheeshMuleDeveloper
monday tuesday	dasherize	Name: dasherize payload.firstName	monday-tuesday
child	pluralize	Name: pluralize payload.firstName	children
cars	singularize	Name: singularize payload.firstName	car
SAtheesh	lower	Name: singularize payload.firstName	satheesh
SaTheesh	upper	Name: singularize payload.firstName	SATHEESH

8. Flatten

When you have a multiple array list from multiple sources as shown below, Flatten will be very handy.

[{
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}],
[{
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}]

flatten.payload will give you

[{
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
},
 {
"firstName":"cars",
"lastName":"Kumar",
"age":"26",
"Amount":10.5
}]

9. Floor and Ceil

The Floor function will round down the decimal value into an integer and Ceil will round up the decimal value into an intenger.

"age":26.5

age: floor payload.age will give you 26.

age: ceil payload.age will give you 27.

10. Now

The Now function will give you the current date and time.

currentTime: now will give you "currentTime": "2016-10-20T17:15:06.196Z."

Strings Data Types IT Operator (extension) Data structure JSON Space (architecture) Java (programming language) dev

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