How can I Upload a json file and read to process data

Community
1

I am trying to access json file using parameter (tried file, stashed) so that I can read content of file(key, value) and process the content. I am not able to read the file successfully. I have tried multiple ways: some examples are here:
properties([
parameters([
file(name: ‘uploadFile’, description: ‘Upload Secrets JSON file’),
base64File(name: ‘FILE’, description: “File to read”),
stashedFile(name: ‘large’),
)
])
])
pipeline {
agent any
stages {
stage('read multiple key values ') {
steps {
echo “Before Script”
script {
echo “Add Multiple Secrets to Key Vault”
unstash ‘large’
sh(script: ‘cat large’, returnStdout: true)

                    echo "END UNSTASH"
                    withFileParameter('FILE') {
                        sh(script: 'cat $FILE', returnStdout: true)
                        echo "END withFileParameter"

                        def jsonFilePath =  large
                        echo "File PAth: ${jsonFilePath}"
                        def secrets = readJSON file: jsonFilePath
                        secrets.each { secret ->
                            if (secret.name && secret.value) {
                                echo "Adding secret ${secret.name} to Key Vault"

                            } else {
                                echo "Secret name or value is missing"
                            }
                        }
                    }   
                } 
            }
        }
    }
}
2

This works.
Created a stashedFile parameter with name stashed and using this script:

pipeline {
    agent {
        label 'built-in'
    }
    stages {
        stage("run") {
            steps {
                script {
                    withFileParameter('stashed') {
                        def j = readJSON file: stashed, text: ''
                        echo j.message
                    }
                }
           }
        }
    }
}