Send POST data with raw json with postman Express

Question

I'm trying to log all the data and then return it as a response.

app.post('/data', (req, res) => {
  const data = req.body
  console.log(data)
  return res.json({
    data
  })
})

I'm sending data with Postman. In the Body tab I have "raw" selected and "JSON (application/json)". Headers tab is Content-Type application/json. I'm sending this:

    {
      "aa": 23
    }

When I click send button all I get is an empty object and the data variable is undefined in my console.log. How to fix it? I double checked everything. It should work, but it doesn't.

Did you install middleware to handle post request data, such as body-parser? — IzzyCooper
– IzzyCooper, Commented Sep 25, 2017 at 22:58

user6117854 · Accepted Answer · 2017-09-25 23:09:35Z

1

It seems like you're passing an invalid value to res.JSON(). Try:

return res.json(data);

answered Sep 25, 2017 at 23:09

user6117854

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2 Comments

James Over a year ago

Not necessarily, perfectly valid JS property shorthand

user5634645 Over a year ago

Now I got nothing in Body and data variable is still undefined in console.log.

score 1 · Accepted Answer · 2017-09-26 08:41:28Z

1

Alright, I found the solution.

"As body-parser module is used to parse the body and urls, it should be called before any call to 'req.body...'."

So I did this:

import bodyParser  from 'body-parser'

const app = express()
app.use(bodyParser.urlencoded())
app.use(bodyParser.json())

app.post('/data', (req, res) => {
  const data = req.body
  console.log(data)
  return res.json({
    data
  })
})

And now it works fine.

edited Sep 26, 2017 at 8:41

answered Sep 25, 2017 at 23:47

user5634645

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