var other_coords = {{ MySQL_Dict|tojson }};
 var other_coords = {{ MySQL_Dict|tojson|safe }};
 var still_more = JSON.parse(other_coords);

@app.route('/', methods=['GET','POST'])
def index():

    points = [{"lat": 43.8934276, "lng": -103.3690243},
              {"lat": 47.052060, "lng": -91.639868},
              {"lat": 45.1118, "lng": -95.0396}]

    return render_template("index.html", points=json.dumps(points))

function initMap() {

    var map = new google.maps.Map(document.getElementById('map'), {
      center: new google.maps.LatLng(43.8934276, -103.3690243),
      zoom: 4
    });

    var points = JSON.parse('{{ points|safe }}');
    var marker;

    for (var i = 0; i < points.length; i++) {

        marker = new google.maps.Marker({
          position: new google.maps.LatLng(points[i].lat, points[i].lng),
          map: map
        });

    }
  }

from flask import jsonify

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def hello_world():
    user = {'firstname': "Mr.", 'lastname': "My Father's Son"}
    return render_template("index.html", user=user)

if __name__ == '__main__':
    app.run()

<p>Hello, <span id="username"></span></p>
<script>
    var user = JSON.parse('{{ user | tojson | safe}}');
    document.getElementById('username').innerHTML = user.firstname + " " +
            user.lastname;
</script>

var user = JSON.parse('{"firstname": "Mr.", "lastname": "My Fatheru0027s Son"}');

var user = JSON.parse('{"firstname": "Mr.", "lastname": "My Father's Son"}');