How to use Groovy JsonOutput.toJson with data encoded with UTF-8? - json

Question

I have a file with UTF-8 encoding.
I write a groovy script to load a file with a JSON structure, modify it and save it:
def originPreviewFilePath = "./xxx.json"
//target the file
def originFile = new File(originPreviewFilePath)
//load the UTF8 data file as a JSON structure
def originPreview = new JsonSlurper().parse(originFile,'UTF-8')
//Here is my own code to modify originPreview
//Convert the structure to JSON Text
def resultPreviewJson = JsonOutput.toJson(originPreview)
//Beautify JSON Text (Indent)
def finalFileData = JsonOutput.prettyPrint(resultPreviewJson)
//save the JSONText
new File(resultPreviewFilePath).write(finalFileData, 'UTF-8')
The problem is that JsonOutput.toJson transforms UTF-8 data to UNICODE. I don't understand why JsonSlurper().parse can use UTF-8 but not JsonOutput.toJson?
How to have JsonOutput.toJson use UTF-8? I need to have the exact inverse of JsonSlurper().parse

Answer 1

In case anyone is still struggling with this, the solution is to disable unicode escaping:
new JsonGenerator.Options()
.disableUnicodeEscaping()
.build()
.toJson(object)

Answer 2

This worked for me in Groovy 3:
StringEscapeUtils.unescapeJavaScript(
JsonOutput.prettyPrint(resultPreviewJson)
)

Answer 3

I believe that the encoding is applied at the incorrect statement while reading itself.
Change below statements from :
def originFile = new File(originPreviewFilePath)
def originPreview = new JsonSlurper().parse(originFile,'UTF-8')
To:
def originFile = new File(originPreviewFilePath).getText('UTF-8')
def originPreview = new JsonSlurper().parseText(originFile)