I am getting this error when attempting to run my web application which is suppose to be a simple calculator. I'm using Nodejs with the express.js framework.
this is my main js file:
const express = require('express');
const app = express();
const port = 3000;
app.use(express.urlencoded({ extended : true}));
app.use(express.json());
app.get("/", function(req, res){
res.sendFile(__dirname + "/index.html");
});
app.post("/", function(req, res){
var num1 = Number(req.body.num1);
var num2 = Number(req.body.num2);
var result = Number(num1 + num2);
res.send(result);
});
app.listen(port, function(){
console.log("SERVER STARTED ON PORT " + port);
});
this is my index.html code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Calculator</title>
</head>
<body>
<h1>Calculator</h1>
<form action="/" method="post">
<input type="text" name="num1" placeholder="first number">
<input type="text" name="num2" placeholder="second number">
<button type="submit" name="submit">Calculate</button>
</form>
</body>
</html>
and this is the error code I get in terminal:
express deprecated res.send(status): Use res.sendStatus(status) instead calculator.js:23:9
RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 4
at ServerResponse.writeHead (_http_server.js:255:11)
at ServerResponse._implicitHeader (_http_server.js:246:8)
at ServerResponse.end (_http_outgoing.js:811:10)
at ServerResponse.send (/Users/<name>/Desktop/Calculator/node_modules/express/lib/response.js:221:10)
at /Users/<>/Desktop/Calculator/calculator.js:23:9
at Layer.handle [as handle_request] (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
at /Users/<name>/Desktop/Calculator/node_modules/express/lib/router/index.js:281:22
that is all the info I can get/give.
I have tried googling for answers but all I got was for error code: 0.
edit: I should note that i am fairly new to nodejs and express.js.
I am getting this error when attempting to run my web application which is suppose to be a simple calculator. I'm using Nodejs with the express.js framework.
this is my main js file:
const express = require('express');
const app = express();
const port = 3000;
app.use(express.urlencoded({ extended : true}));
app.use(express.json());
app.get("/", function(req, res){
res.sendFile(__dirname + "/index.html");
});
app.post("/", function(req, res){
var num1 = Number(req.body.num1);
var num2 = Number(req.body.num2);
var result = Number(num1 + num2);
res.send(result);
});
app.listen(port, function(){
console.log("SERVER STARTED ON PORT " + port);
});
this is my index.html code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Calculator</title>
</head>
<body>
<h1>Calculator</h1>
<form action="/" method="post">
<input type="text" name="num1" placeholder="first number">
<input type="text" name="num2" placeholder="second number">
<button type="submit" name="submit">Calculate</button>
</form>
</body>
</html>
and this is the error code I get in terminal:
express deprecated res.send(status): Use res.sendStatus(status) instead calculator.js:23:9
RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 4
at ServerResponse.writeHead (_http_server.js:255:11)
at ServerResponse._implicitHeader (_http_server.js:246:8)
at ServerResponse.end (_http_outgoing.js:811:10)
at ServerResponse.send (/Users/<name>/Desktop/Calculator/node_modules/express/lib/response.js:221:10)
at /Users/<>/Desktop/Calculator/calculator.js:23:9
at Layer.handle [as handle_request] (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/<name>/Desktop/Calculator/node_modules/express/lib/router/layer.js:95:5)
at /Users/<name>/Desktop/Calculator/node_modules/express/lib/router/index.js:281:22
that is all the info I can get/give.
I have tried googling for answers but all I got was for error code: 0.
edit: I should note that i am fairly new to nodejs and express.js.
Share Improve this question edited Apr 18, 2021 at 20:11 Pickle asked Apr 18, 2021 at 19:57 PicklePickle 572 silver badges7 bronze badges 3-
1
res.send([body]): The body parameter can be a Buffer object, a String, an object, Boolean, or an Array.You're passing it a number. – tkausl Commented Apr 18, 2021 at 20:01 - 1 thank you, I fixed it by doing res.send([result]); instead of res.send(result); , though I get [<result>]. – Pickle Commented Apr 18, 2021 at 20:07
-
Also for anyone else who might be confused, note the difference between
res.send(..)(which can't accept an integer) andres.status(...)(which can accept an integer) – Nate Anderson Commented May 22, 2024 at 15:56
2 Answers
Reset to default 2It would be better to respond with JSON, that would make it more extendable in the future, something like:
res.send({value: result})
Responding with an object would work, res.send will convert to your object to a JSON string and send it the response.
According to the express documentation you can't send a number in the res.send(...) method as @tkausl pointed out.
I had the same problem. Just add some text to your result number. It will work.
For example:
res.send("This is your answer " + result);
When I did like this, the error disappeared.