has been blocked by cors policy in express react
Using npm: To allow cross-origin requests install ‘cors’: npm i cors Add this in the server-side: let cors = require(“cors”);app.use(cors());
How to use dotenv in js project
//first install this npm install dotenv //then add this on the top of the your code require(“dotenv”).config(); //first create file with name of .env DB_HOST=localhost DB_USER=root DB_PASS=s1mpl3 //then use it const db = require(‘db’) db.connect({ host: process.env.DB_HOST, username: process.env.DB_USER, password: process.env.DB_PASS })
How to fix the Express req.body undefined error
Now, if we send a JSON data to the /users route, we will see an undefined in the console. To fix this error, first we need to parse our incoming requests by using the express.json() , express.urlencoded() middleware functions. const express = require(“express”); const app = express(); // middleware app.use(express.json()); app.use(express.urlencoded()); app.post(“/users”, (req, res) => { console.log(req.body); }); app.listen(3000, () => console.log(`App is …
Cannot read property ‘push’ of undefined in express [Solved]
this.stack.push(layer); ^ TypeError: Cannot read property ‘push’ of undefined const routers = require(‘express’).Router; change to below const routers = require(‘express’).Router();
set counter i n react
<button className=“btn btn-success” onClick={() => setCount(1)}>Reset</button> const [count, setCount] = useState(1); <button className=“btn btn-primary” onClick={() => setCount(prevCount => prevCount – 1)}>–</button> <input className=“” type=“text” value={count}></input> <button className=“btn btn-primary” onClick={() => setCount(prevCount => prevCount + 1)}>+</button>
update object value in an array in javascript
const storage= [ { id:1, name:“kahnu”, email:“[email protected]”, age:21, phone:1234567890 }, { id:2, name:“kahnu2”, email:“[email protected]”, age:22, phone:1234567890 }, { id:3, name:“kahnu3”, email:“[email protected]”, age:23, phone:1234567890 } ] const objIndex = storageData.findIndex((obj => obj.id == ‘1’)); storageData[objIndex].name = ‘new name’; storageData[objIndex].email = ‘new email’; storageData[objIndex].age = ‘new age’; console.log(“After update: “, storageData[objIndex])
listing all filenames in a csv file in ubuntu
find /home/kahnucharanswain/Kanha/vm/GACMIS/Dataset/Songs/Bollywood_Rap -iname ‘*.opus’ -type f >tif_filenames.csv
Open window in same tab
window.open(“https://www.youraddress.com”,“_self”)
git ignore .env files not working
https://stackoverflow.com/questions/38983153/git-ignore-env-files-not-working
Remove/Delete All dcoker images containers
# List all containers (only IDs) docker ps -aq # Stop all running containersdocker stop $(docker ps -aq)# Remove all containersdocker rm $(docker ps -aq)# Remove all imagesdocker rmi $(docker images -q)