react native get version from package.json

// Add deps in top
import groovy.json.JsonSlurper


// Add this function to your android/app/build.gradle

def getFromPackage(field) {
    def inputFile = new File("$rootDir/../package.json")
    def packageJson = new JsonSlurper().parseText(inputFile.text)
    return packageJson[field]
}

// Use function for getting version

defaultConfig {
  ...
  versionCode getFromPackage("version")
  ...
}