Unexpected token in JavaScript from render template

I'm trying to send an array from a Python function to JavaScript using Flask, but the problem is I keep getting Unexpected token { in my code and Uncaught SyntaxError: Unexpected token { in my console.

This is my Python code, hashtags.py:

import tweepy
import json
from flask import Flask, request, render_template

app = Flask(__name__)
@app.route('/map/')
@app.route('/map/<trends>')

    import tweepy
    import json
    from flask import Flask, request, render_template
    def trend_hash(id):
        for location in api.trends_place(id):
         for trend in location["trends"] :
            trends = trend["name"]
        with app.app_context():   
         return render_template("/map.html", trends=json.dumps(trends))


trend_hash(1939753)

And this is my script in map.html (Where the problem occurs):

function getHashtags() {
   var trends = ;
   console.log(trends);
   console.log("done"); }

And if I change this line:

var trends = ; 

to:

var trends = (trends|safe);

I get this error in my console:

Uncaught ReferenceError: safe is not defined

I also tried this statement:

var trends = JSON.stringify();

But unfortunately I still get the same problem.

My framework: Cloud9

I've searched but no solution seems to work.

Thank you.