Response to preflight request doesn't pass access control check: The 'Access-Control-Allow-Origin'

const cors = require('cors');

const corsOptions = {
    origin: 'https://backend.com/',
    optionsSuccessStatus: 200,
    credentials: true

}

app.use(cors(corsOptions));

//  prelight cors error
app.options('*', cors(corsOptions));


app.use((req,res,next)=>{
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, PATCH, DELETE, OPTIONS');
    res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');

    next();
})

 axios.post('https://backend.com/blog', {
      method: 'POST',
      headers: { 
        'Content-Type': 'application/json'

      },
      body: JSON.stringify(sendData)
    })