Trouble getting user id from spotify api

How can I create a new playlist in Spotify? I already have the access token from the user and the tracks objects stored locally, I'm trying by sending the request to the API but it asks for a user id which I don't have and don't know how to get. I find the spotify documentation a bit confusing.

This is how I search tracks

  searchTracks(searchTerm:string,token:string) {
    let url = this.tracksUrl + searchTerm;
    let headers = new Headers();
    headers.append('Authorization' , 'Bearer ' + token);
      return this.http.get(url, {headers : headers}).map((res: Response) => res.json());
  }

And this is how I get the token

ngOnInit() {//usar sessionStorage, dura solo hasta que cerras la ventana
      this.token = sessionStorage.getItem('myToken');//null when not loaded
      console.log("1st log:" + this.token);
      if(this.token == null){
        let possibleToken:string = window.location.href;//usar provider angular
        let position:number = possibleToken.indexOf('access_token=')+13;//13 is the length of 'acces_token='
        let lastPos:number = possibleToken.indexOf('&token_type');
          if(lastPos !== -1){//if we have token
            this.token = possibleToken.slice(position,lastPos);
            console.log("2nd log" + this.token);
            sessionStorage.setItem('myToken', this.token);
          }
      }
}