使用 Mule 4 dataweave 删除 JSON 消息中所有可能的空格

Question

I have a JSON message where I need to remove all format spaces keeping values untouched. This is required before running a hash function over the full payload so it needs to be precise.

I started with the indent=false in the Dataweave writer configuration but I got a space after each colon like this:

{"text": "number\": 1 | array\": [ | number\": 1","number": 1,"array": [1,"as",[],{}]}

Any suggested elegant solution to remove the spaces left before entering in the RegEx world? If not, any RegEx solution?

Answer 1

I have got this solution following @SalimKhan (thanks for that.) suggested post. Basically I just wrote a full JSON custom writer on DataWeave.

fun jsonWrite(item) = item match {
    case is Array -> "[" ++ joinBy($ map jsonWrite($), ",") ++ "]"
    case is Object -> "{" ++ joinBy($ pluck ("\"" ++ $$ ++ "\":" ++ 
        ($ match {
            case is String -> "\"" ++ ($ replace "\"" with "\\\"") ++ "\""
            case is Object -> jsonWrite($)
            case is Array -> "[" ++ joinBy($ map jsonWrite($), ",") ++ "]"
            else -> $
        })),",") ++ "}"
    case is String -> "\"" ++ ($ replace "\"" with "\\\"") ++ "\""
    else -> $
}

Answer 2

I tried to remove all space from a json using below dw scripts. The below one will give json in a stream with no indent, but there will be space after each colon.

%dw 2.0
output application/json indent=false
---
{
    name: "somename",
    city: "sg",
    profession: "tenchdigger"
}

The output of above script is converted to string and all spaces are removed using below script

%dw 2.0
var someSpaceJson = write(payload, "application/json", {"indent":false}) 
output application/java
---
someSpaceJson replace " " with ""

The end result is a json string with no space

"{"name":"somename","city":"sg","profession":"tenchdigger"}"