JSONata 数据映射模板

Question

I'm starting to use JSONata for data transformation and I was wondering if there exists a way to have a file which contains values transformation for some fields in json file.

I will have to do multiple transformation types, but most cases will be to translate a field value from "A" to "B" for example and I will be easier to do that in a file in order to not create new versions of data transformation and just will be necessary to create a new entry in this file.

Regards

Answer 1

You can use $lookup to perform simple mappings. For example, with the following JSON:

{
  "mapping": [
    { "a": "a1" },
    { "b": "b1" }
  ],
  "values": [
    "a", "b"
  ]
}

You can map the values using:

values.$lookup($$.mapping, $)

In which case the result will be:

[
  "a1",
  "b1"
]

Alternatively you can look at $sift which will allow you to write a function to sift through the mappings.