Categories
Mastering Development

Can’t use createRef in latest version of create-react-app

I am learning React using create-react-app, and I’m getting this error in my app: TypeError: react__WEBPACK_IMPORTED_MODULE_0___default.a.createRef() is not a function Now, I know that this feature was only introduced in React 16.3, but that seems to be the version I have installed. I initialized everything by typing: npx create-react-app probando02 If I check my version: […]

Categories
Mastering Development

Fetch call returns react index.html and chrome gives error Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

I am trying to fetch data from my local express server, and display it with react, but it seems that the index.html of the react app is being returned. If I check the network tab in the console and it shows that there is a fetch request with the name "projects/" and when I hover […]

Categories
Mastering Development

Fetch call returns react index.html and chrome gives error Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

I am trying to fetch data from my local express server, and display it with react, but it seems that the index.html of the react app is being returned. If i check the network tab in the console and it shows that there is a fetch request with the name "projects/" and when i hover […]

Categories
Mastering Development

Error 401 while reloading Jwt secured spring Boot React app (and configuration problems)

I’m learning spring boot and react. I have successfully learnt how to use the frontend maven plugin to combine the two. Also JWT kind of works (at least an api call returns what I want while the token is alive and returns error when i set quick expiration time). But react routes work weirdly. I […]

Categories
Mastering Development

React/Node app in Heroku, serving index.html/index.js with server running

I’m pretty sure that this issue is localized to my start scripts. When looking online people will post differing start scripts. Some have “start”: “node index.js” -> (this won’t start my server), gives an H10 error in heroku logs Others have “start”: “nodemon server.js” -> (this runs the server, serves the index.html, but it won’t […]

Categories
Mastering Development

My react app on heroku opens home page but will not open other pages

My react app runs fine locally, and deploys to heroku. However, from the home page, any link to another page shows a blank page with ‘not found’ on it. There are no other error messages. Here is my server-side package.json file: { “name”: “portfolio-generator”, “version”: “1.0.0”, “description”: “”, “main”: “server.js”, “engines”: { “node”: “12.16.x” }, […]

Categories
Mastering Development

npm start does nothing on windows

When I try to run npm start just after creating application with npx create-react-app, it does anything and exits with code 0. When I try to execute npm start command, I get the following message: C:\projects\novo-curriculo\ui>npm start > novo-curriculo-ui@0.1.0 start C:\projects\novo-curriculo\ui > react-scripts start When I enable –verbose options, I receive the following logs, which […]

Categories
Mastering Development

Deploying personal github pages (React App) just shows Readme

I’m trying to deploy a user-github page at username.github.io. So not a project page. However, after following steps online, I’m met with just the readme.md. The existing questions about problems releated to this are for github pages (username.github.io/someproject), whilst this is just for username.github.io. Procedure npm install gh-pages –save-dev in package.json: “homepage”: “https://myusername.github.io”, “name”: “homepage”, […]

Categories
Mastering Development

Heroku Error Code H10 – cannot get app to load, no solution seems to work

I’m having what seems to be a common issue with heroku deployment, but have searched for hours over multiple days for a solution on stackoverflow and other online resources and with mentors and nothing has worked. This is the error code I’m getting: 2020-05-14T01:20:34.309134+00:00 heroku[web.1]: State changed from starting to crashed 2020-05-14T01:26:51.177016+00:00 heroku[router]: at=error code=H10 […]

Categories
Mastering Development

I can’t seem to be able to use hooks in react

I’m starting a new react app. So far, nothing weird has been added. This is how my package.json looks like: { “name”: “client”, “version”: “0.1.0”, “private”: true, “dependencies”: { “@testing-library/jest-dom”: “^4.2.4”, “@testing-library/react”: “^9.3.2”, “@testing-library/user-event”: “^7.1.2”, “axios”: “^0.19.2”, “bootstrap”: “^4.4.1”, “fibers”: “^5.0.0”, “jquery”: “^3.5.0”, “moment”: “^2.24.0”, “node-sass”: “^4.14.0”, “popper”: “^1.0.1”, “react”: “^16.13.1”, “react-bootstrap”: “^1.0.1”, “react-dom”: “^16.13.1”, […]