I am getting 400 bad request when trying to get list of issues via jira rest api

[robera worku]

here is my rest client code

exports.jqlBuilder = function(project, issueType, label, fromDate, toDate, thisMonth) {
 var baseUrl = "https://xxx.atlassian.net/rest/api/2/search?jql=";
 var extend = "&fields=issuetype,priority,assignee,status,description,created,creator,reporter,duedate,summary,resolution,updated,resolutiondate&expand=changelog&startAt=";
 if (thisMonth) {
  var req = encodeURIComponent("project = ") + "'" + project + "'" + encodeURIComponent(" AND issuetype = ") + "'" + issueType + "'" + encodeURIComponent(" AND labels in (") + label + encodeURIComponent(") AND created >= startOfMonth() AND created <= endofMonth()");
  var searchUrl = baseUrl + req + extend;
  return fetchedIssues(searchUrl);
}

and here is the fetchedIssues function

function fetchedIssues(searchUrl) {
 return new Promise(function(resolve, reject) { 
  getIssues(searchUrl).then((result) => { resolve(result) });})}

and here is my getIssues function

function getIssues(url) {
 return new Promise(function(resolve, reject) { issue(url, startAt).then(function(result) {*
  ***}/*not important*/

function issue(url, startIndex) {
 return new Promise(function(resolve, reject) {
  client.get(url + startIndex, function(data, response) {
  if (response.statusCode !== 200) {
   reject(new Error('Fail with the status code: ' + response.statusCode));}
  resolve(data); }) })}

this code executes 2 times and works on the second. i dont know why though

here is the response i get

{ errorMessages:
 [ 'Error in the JQL Query: Expecting either \'OR\' or \'AND\' but got \'Jun\'. (line 1, character 71)' ],
 errors: {} } 

[robera worku · Accepted solution]

Found the problem. Not related to jira rest api.It was a condition i have set.