CODEWITHSUNDEEP
express
simon
simon

Reputation: 101

can not read property of undefined when it is defined properly in express

I have a POST request (content-type: text/plain) with this body: {"initObj":{"UDID":"123456"}}

It shows "Cannot read property 'UDID' of undefined"

When I do this:

console.log(req.body);

It shows the request body correctly, but when I do this:

console.log(req.body.initObj);

it shows undefined

Here is the configuration of the server:

app.use(cors());
app.use(bodyParser.text());
app.use(bodyParser.json());

// parse application/vnd.api+json as json
app.use(bodyParser.json({ type: 'application/vnd.api+json' }));

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: true })); //true

// override with the X-HTTP-Method-Override header in req
app.use(methodOverride('X-HTTP-Method-Override'));

Upvotes: 0

Views: 77

Answers (1)

robertklep
robertklep

Reputation: 203231

If you upload the data as text/plain, req.body will be a string (containing some JSON text, but because it's uploaded as text, body-parser won't parse it into a proper object). And strings don't have a property called initObj.

You should either parse the data yourself:

let data = JSON.parse(req.body);
console.log(data.initObj);

Or upload as application/json (which makes more sense to me).

Upvotes: 1

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