How to replace a string in a file using jenkins pipeline script

Question

I am trying to edit a file package.json and trying to replace a string("version:1") inside it using jenkins pipeline script. I have written below script but its not working.

def readContent = readFile './package.json'

updatedProp = readContent.replaceAll("version:.*","version:${env.ReleaseNumber}.${BUILD_NUMBER},")
 
writeFile file: './package.json', text: "${updatedProp}"

package.json file contains below content.

{
    "name": "application",
    "version": "1.0.0"
}

I request to correct me and help me building the code.

Answer 1

Check the following code.

def data = readJSON file: 'package.json'
String val = "${ReleaseNumber}"
data['version'] = val
writeJSON file: 'package.json', json: data,  overwrite: true

Update with prettyfy

You will have to import JsonOutput hence add import groovy.json.JsonOutput before the pipeline.

def data = readJSON file: 'package.json'
String val = "${ReleaseNumber}"
data['version'] = val
def formtted = JsonOutput.prettyPrint(JsonOutput.toJson(data))
writeFile file: 'package.json', text: formtted,  overwrite: true