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November 24, 2022

DataWeave Delight: Turn String Into Snake Case With underscore

In a previous post we learned we can turn a string into a string with kebab casing using dasherize from the dw::core::Strings module. If we want to turn a string into a string with camel casing we can use the underscore function. The underscore function will replace spaces, dashes and camel-casing with underscores, which makes the result snake-casing. Any uppercase characters are transformed to lowercase characters.

In the following example we use the underscore function with different input string arguments:


%dw 2.0
import underscore from dw::core::Strings
output application/json
    // Replaces camel casing with underscores.
    camelCase: underscore("stringInCamelCase"), // string_in_camel_case
    // Replaces dashes with underscores.
    kebab_case: underscore("string-with-dashes"), // string_with_dashes
    // Replaces spaces with underscores.
    spaces: underscore("string with spaces"), // string_with_spaces
    // Uppercase is transformed to lowercase.
    upper: underscore("STRING_WITH_UPPERCASE") // string_with_uppercase


  "camelCase": "string_in_camel_case",
  "kebab_case": "string_with_dashes",
  "spaces": "string_with_spaces",
  "upper": "string_with_uppercase"

Written with DataWeave 2.4.