nodeJS 调用外部接口 内容中含中文时报错

调用外部接口 内容中有中文 接口返回内容：errmsg:could not read JSON

                        var body={
                            to_user:'02e39d1bfddd41dfb0ac171d4af36749',
                           message:{
                              content:'新增单据'  //'Add New Asn Order Number'
                           }
                        }
                    
                    console.log(bodyString);

                    var bodyString = JSON.stringify(bodyStrings)
                    var TokenList = await GetToken.GetToken();
                    var Urls='https://open.qingtui.cn/v1/message/text/send/single?access_token=';
                    var URL = Urls+'eyJhbGciOiJIUzI1NiJ9.eyJkb21haW5faWQiOiIzNjA4NDlkZWJhNzg0MGE1YjkzZDk4ZmM3Yjc4MzRiMyIsImRpc3BhdGNoIjoxNjYyMzYyOTY5ODQzLCJhcHBpZCI6IjkyMjE1MDgzMTciLCJleHBpcmVzX2luIjoxNjYyMzcwMTY5ODQzfQ.z6XELv62oUAeeDZpJe0dAq97PriA5vxD3FNbA4emO-c'
                    console.log(URL);

                    console.log('-----------options------',options);
                    console.log(GetUsersList);
            
                    let request = require('request');
                    function execute_http_request(options, body, callback) {
                        bodyStrings={
                            to_user:GetUsersList[0],
                           message:{
                              content:'Add New Asn Order Number'
                           }
                        }

                        var bodyString = JSON.stringify(bodyStrings)

                        let o = {
                            url: URL,
                            method: 'POST',
                            strictSSL: false,
                            timeout: 1500,
                            headers:{
                            'Content-Type':'application/json',
                            'Content-Length':bodyString.length
                            }
                            body: bodyString
                        };
                    
                        // console.log(o);
                    
                        request(o, (err, response, body) => {
                            if (err) {
                                console.log('err= ' + err)
                            } else {
                                // console.log('response = ' + JSON.stringify(response)
                                console.log('body = ' + body)
                            } 
                        });
                        }
                }
                var qingtui =  execute_http_request(options,bodyString);

body = {"errcode":47002,"errmsg":"could not read JSON"}

调用接口时 内容中的content是英文字符可正常调用 是中文则接口回复 could not read JSON

想要中文也能正常传递接口

could not read JSON
传递的不是json数据，导致的异常，将最终调用传递的json数据打印出来看下。