SyntaxError: Unexpected token -while using pydeck_chart

Using Streamlit
1

Hi all !

I am facing SyntaxError at JSON.parse while using pydeck_chart. Note I created mapbox account and set my token to ~/.streamlit/config.toml.

I would be grateful if you can give me some advice.

Here is the error message and my code.

スクリーンショット 2020-11-18 16.48.47
スクリーンショット 2020-11-18 16.48.471426×602 106 KB

import streamlit as st
import pydeck as pdk
import pandas as pd

map_style = "mapbox://styles/mapbox/streets-v11"
initial_view_state = pdk.ViewState(latitude=0,longitude=0,zoom=13,pitch=50)
st.pydeck_chart(pdk.Deck(map_style = map_style, initial_view_state = initial_view_state,
            layers=[pdk.Layer("ScatterplotLayer",data=df, get_position='[lon, lat]',get_color='[200, 20, 0, 100]',get_radius=10)]))

Python 3.6.1
UbuntuOS 18.04
streamlit 0.71.0
pydeck 0.5.0

Thank you.

2 Likes
2

I am encountering a similar error, my application works fine for a limited number of lat,lon pairs but when I try to use a larger dataset this error occurs. Any help on this would be greatly appreciated.

3

Edit: I removed a column containing names and the issue is gone. Maybe it was caused by some special characters in that column. Not a fix, though.

Same issue. In my case the map is working fine on localhost, but it’s returning the SyntaxError on the server. I have other maps working fine, only one is returning this error.

1 Like
4

I was having the same issue. The problem was caused by NA values in a string column. I guess pydeck isn’t treating this sort of error. I don’t think it’s anything directly related to streamlit. I’ve seen in stackoverflow that if .to_html() is used in pydeck, this error is suppressed. Haven’t tried that though.
Hope I helped in some way

5

yep thanks, you are right it’s not streamlit, its pydeck. thanks for the .to_html() idea, I will give it a try if I run into this again in the future.