I can not get data from the json request - node.js

Question

I send JSON data to route:
const data=[{name:this.name}]
//qs.stringify(payload)
axios
.post('/users',{name:this.name})
.then(
response => {
console.log(response.data);
}
)
.catch(
// error=>console.log(error)
)
And try get data:
router.post('/', function (req, res, next) {
var data = req.body; // here is your data
var obj=JSON.parse(data);
console.log(obj.toString());
res.toString("ok");
});
And I got error 500.
Why not get the data?

Answer 1

Your client side code is fine, except that the constant named data is entirely unused. On server-side however, req.body almost certainly contains a parsed JSON object (provided you have included a body paring middleware already). If you haven't included any body parsing middleware then req.body would be undefined.
Additionally, the toString() method in res doesn't send any response, it simply returns a string representation of the response.
You would need to make following changes to your code:
Include a body parsing middleware (eg. body-parser) to your express middleware chain, if one isn't already included.
Don't call JSON.parse(req.body). body-parser would already have done that. Calling it again will only throw exception, and return 500.
To convert an Object to JSON string, use JSON.stringify() method. obj.toString() will probably only return [object Object].
Send response using one of .send(), .json(), .end() methods on res. Since you need to send a string back, res.send("ok") seems most appropriate.
The changed code should appear something like this:
router.post('/', function (req, res, next) {
var data = req.body; // here is your data
console.log(JSON.stringify(data));
res.send("ok");
});