learn-react | 用reactredux写的demo | Frontend Framework library

I want to create an upload button using ReactJS with typescript. For now, I just want to do it super simple, and followed this tutorial for "classic" ReactJS: https://www.js-tutorials.com/react-js/learn-react-file-upload-in-5-minute/

Here is my version using with typescript:

I am learning node.js.

Here is the code. It works well.

However, I don't understand why I can't use req.body as a parameter directly?

Just learning GraphQL, I have this query:

I am trying to display Node.JS API's data using React and getting this error. The data is stored using MongoDB. It doesn't give out error while displaying the upvotes. It only gives error while printing out the comments.

This is the data that I am trying to print. Mainly I am trying to print the comments. I am not sure what mistake I am doing here while printing the data.

I am hitting this problem constantly, and have been stuck at it for a long time now. I am new to mbdreact library and I have been trying this example of theirs from this link. This has given me too many problems in debugging and understanding what is going on.

Problem :

I am currently working with react 15.4.2 and redux, i am going to keep my react/redux state whenever the browser refresh. and i found people are suggesting redux-persist but when i follow the instruction of basic usage, it doesn't work at all, all state returning to empty again when i refresh my browser. this is what shown by logger

rehydrate only show once (at the first time ), and never happen again while doing another action. and here is my store.js

I'm a newbie I've download some source in this link https://github.com/the-road-to-learn-react/react-redux-example i have some proplem in file src/app.js line 4

I'm using the excellent work of Robin Wieruch to understand how to make a call to an API Endpoint. Here's one of his projects: https://github.com/the-road-to-learn-react/react-hooks-introduction

Shown below is a modified version of his useDataApiHook-example. With it I wired up two buttons, which then give me 3 ways to query an endpoint. I've chosen to use the same endpoint in all cases but have tested it with different endpoints and it seems to work fine.

I'm trying to get the titles of reddit posts from a subreddit in React, using Axios for fetching.

I can fetch the JSON from here, and would like to get the data of each object (post/comment) separately (so I can show titles, post text and the like in the render() part of the component).

Here's the first lines of that JSON, pretty-printed: