Create Sqlite Insert Query For JSON Object (Javascript/typescript)

//col list
let col = ["A", "B", "C"];

//Sample Object List
letsomeObj= [
{ A: 1, B: 2, C: 3 },
{ A: 1, B: 2, C: 3 },
{ A: 1, B: 2, C: 3 }
];

//function call..

this.createSqlQuery("PKTABLE", col, someObj);

createSqlQuery(tableName: string, columns: string[], obj: any) {
    this.generatedSqlQuery = `INSERT INTO ${tableName} `
    let columnList = "";
    columnList = columnList + "("
    for (let index = 0; index < columns.length; index++) {
      if (index == columns.length - 1) {
        columnList = columnList + columns[index];
      } else {
        columnList = columnList + columns[index] + ",";
      }
    }
    this.generatedSqlQuery = this.generatedSqlQuery + columnList + ") VALUES ";

    for (let index = 0; index < obj.length; index++) {
      let item = obj[index];

      if (index == columns.length - 1) {
        this.generatedSqlQuery = this.generatedSqlQuery + "(";
        for (var key in obj[index]) {
          if (obj[index].hasOwnProperty(key)) {
            var val = obj[index][key];
            this.generatedSqlQuery = this.generatedSqlQuery + val + ",";
          }
        }
        this.generatedSqlQuery = this.generatedSqlQuery.slice(0, -1);
        this.generatedSqlQuery = this.generatedSqlQuery + ")";
        if (index == columns.length - 1) {
          this.generatedSqlQuery = this.generatedSqlQuery + ",";
        }
        if (obj.length == 1) {
          this.generatedSqlQuery = this.generatedSqlQuery.slice(0, -1);
        }
      } else {
        this.generatedSqlQuery = this.generatedSqlQuery + "(";
        let length = 0;
        for (var key in obj[index]) {
          length++;
        }
        for (var key in obj[index]) {
          if (obj[index].hasOwnProperty(key)) {
            var val = obj[index][key];
            this.generatedSqlQuery = this.generatedSqlQuery + val + ",";
          }
        }
        this.generatedSqlQuery = this.generatedSqlQuery.slice(0, -1);
        this.generatedSqlQuery = this.generatedSqlQuery + "),";
        if (obj.length == 1) {
          this.generatedSqlQuery = this.generatedSqlQuery.slice(0, -1);
        }
        
      }
    }
    if (obj.length > 1) {
      this.generatedSqlQuery = this.generatedSqlQuery.slice(0, -1);
    }
    console.log(generatedSqlQuery);
    return this.generatedSqlQuery;
  }