@RestResource(urlMapping='/LeadService/*')
global without sharing class LeadService {
    @HttpPost
    global static String createLead(LeadInfoParser leadrec){
        Lead leadObj = new Lead();
        leadObj.FirstName =leadrec.FirstName;
        leadObj.LastName=leadrec.LastName; 
        leadObj.Phone=leadrec.Phone;
        leadObj.email=leadrec.email; 
        leadObj.Company = leadrec.Company;
        leadObj.Status = leadrec.LeadStatus;             
      
        Database.saveResult saveResult = database.insert(leadObj,false);
        if(saveResult.isSuccess()){
            System.debug('Record Id:'+saveResult.getId());
        }
        else{
            System.debug('saveResult:'+saveResult.getErrors());
        }
        //Response
        JSONGenerator gen=JSON.createGenerator(true);     
        gen.writeStartObject();
        gen.writeStringField('message','Lead record is created Successfully');
        gen.writeEndObject();     
        String responseString= gen.getAsString();
        return responseString;
    }
    global class LeadInfoParser {   // this wrappr class should be part of this class
        global String LastName{get;set;}
        global String FirstName{get;set;}
        global String Company{get;set;}
        global String email{get;set;}
        global String Phone{get;set;}
        global String LeadStatus{get;set;}
     }
  }