fetch json data error

[SOunit]

action

• fetch data from backend

error message

VM109:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

fix

• add cors to backend

  npm i cors

  
  const cors = require("cors");

app.use(cors());

# fix2 (without middleware)
- add response header to backend data

app.use((req, res, next) => { res.setHeader("Access-Control-Allow-Origin", "*"); res.setHeader( "Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization" ); res.setHeader("Access-Control-Allow-Methods", "GET, POST, PATCH, DELETE"); next(); });

## ref
https://github.com/SOunit/the_mern_stack_heroku_node/blob/main/app.js

[SOunit]

bug solved.