Javascript: sending variables from client to express.js

Question

I cannot send a variable from a js application to node.js server. Here is my code:

 //client side $.get('http://smart-shopper.ro/messages?from=lastGeneralTimeStamp', datas => { console.log("data este " + datas) }) //and server side: app.get('/messages/:from', (req, res) => { let lastGeneralTimeStamp = req.parms.from; var sql = `select * from chat where data > '${lastGeneralTimeStamp}' order by id ASC `; con.query(sql, (err, result) => { if (err) throw err; // res.send(result); res.send(result); console.log(result) }) }) 

Can anyone help me?

Thanks

Answer 1

You are doing GET to: http://smart-shopper.ro/messages?from=lastGeneralTimeStamp

which is query param with the name from. To access query params you cant use

let lastGeneralTimeStamp = req.parms.from;

but rather

req.query.<name_of_query_param> 

in your case its:

req.query.from

Answer 2

Try using req.query instead of req.params .

According to this documentation that's how you access the query string.

Answer 3

You are passing data as querystring, but your API on server side is listening data as param.

Change the request in client side:

 //client side $.get('http://smart-shopper.ro/messages/lastGeneralTimeStamp', datas => { console.log("data este " + datas) }) //and server side: app.get('/messages/:from', (req, res) => { let lastGeneralTimeStamp = req.params.from; var sql = `select * from chat where data > '${lastGeneralTimeStamp}' order by id ASC `; con.query(sql, (err, result) => { if (err) throw err; // res.send(result); res.send(result); console.log(result) }) }) 

Or server side API:

 //client side $.get('http://smart-shopper.ro/messages?from=lastGeneralTimeStamp', datas => { console.log("data este " + datas) }) //and server side: app.get('/messages', (req, res) => { let lastGeneralTimeStamp = req.query.from; var sql = `select * from chat where data > '${lastGeneralTimeStamp}' order by id ASC `; con.query(sql, (err, result) => { if (err) throw err; // res.send(result); res.send(result); console.log(result) }) }) 

Answer 4

可能的错字： req.params.from而不是req.parms.from