function test(url){

const authEncoded=base.encode("mobile_android:secret");
console.log(authEncoded)

const jbody={
'username':urlencode('b@p.com'),
'password':urlencode('123456'),
'client_id':urlencode('mobile_android'),
'client_secret':urlencode('secret'),
'grant_type':urlencode('password')
}

request({
 url: url,
 method: "POST",
 headers: {
     "Authorization": "Basic "+authEncoded,
     "Content-Type":"application/x-www-form-urlencoded",
     "Content-Length": Buffer.byteLength(JSON.stringify(jbody))

 },
 body: jbody,
json:true
}, function (error, response, body){
  console.log(response);
  console.log(error);
  console.log(body)
 });
 }

D:Nodenode_modulesrequestlibquerystring.js:43
 return str.replace(/[!'()*]/g, function (c) {
         ^

TypeError: str.replace is not a function
at Querystring.rfc3986
(D:Nodenode_modulesrequestlibquerystring.js:43:14)
at Request.json (D:Nodenode_modulesrequestrequest.js:1293:30)
at Request.init (D:Nodenode_modulesrequestrequest.js:406:10)
at new Request (D:Nodenode_modulesrequestrequest.js:127:8)
at request (D:Nodenode_modulesrequestindex.js:53:10)
at test (D:Nodetesting.js:24:4)
at Object.<anonymous> (D:Nodetesting.js:42:1)
at Module._compile (internal/modules/cjs/loader.js:759:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
at Module.load (internal/modules/cjs/loader.js:628:32)
at Function.Module._load (internal/modules/cjs/loader.js:555:12)
at Function.Module.runMain (internal/modules/cjs/loader.js:824:10)
at internal/main/run_main_module.js:17:11