Flutter app make nodejs API call to add Todo data into mongodb database

[@gamahiru3804]

Hello i'm from Vietnamese
And i like this video

[@snigdhabonnechance7560]

Hii, such a good series...end-to-end description...I'm stuck in the Add button...when I click Add button in the App... it does not respond...pls help..!

[@jarintasnim9186]

Hello sir,
When i implemented this code , i facing "type null is a sub string type" on flutter
Can u please tell me why i m facing it