NodeJs: The "chunk" argument must be of type string or an instance of Buffer
Dung Do Tien May 27 2022 454
Hi dev guys. I am a newbie in Nodejs. I wrote an application that help change the random background colors for this app. I created a module that help return a random color for me. Like this:
colors.js
class Color {
constructor(name, code) {
this.name = name;
this.code = code;
}
}
const allColors = [
new Color('brightred', '#E74C3C'),
new Color('soothingpurple', '#9B59B6'),
new Color('skyblue', '#5DADE2'),
new Color('leafygreen', '#48C9B0'),
new Color('sunkissedyellow', '#F4D03F'),
new Color('groovygray', '#D7DBDD'),
];
exports.getRandomColor = () => {
return allColors[Math.floor(Math.random() * allColors.length)];
}
exports.allColors = allColors; index.js
const http = require('http');
const colors = require('./colors');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end(colors.getRandomColor());
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
}); But when I run the command node index.js I got an exception throw TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer. Received an instance of Color.
TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer. Received an instance of Color
at ServerResponse.end (_http_outgoing.js:745:13)
at Server.<anonymous> (C:\Users\conta\source\repos\NodeJs\Demo1\index.js:9:7)
at Server.emit (events.js:315:20)
at parserOnIncoming (_http_server.js:790:12)
at HTTPParser.parserOnHeadersComplete (_http_common.js:119:17) {
code: 'ERR_INVALID_ARG_TYPE'
} I tried to log console.log(colors.getRandomColor()); but it's still returning random colors for me well.
Anyone can help me?
Have 1 answer(s) found.
- M1
Minh Yến May 27 2022
This error occurred because your function
colors.getRandomColor()return an object, not a string. So you need to convert it to string first. you can useJSON.stringify()method, see the code below:const http = require('http'); const colors = require('./colors'); const hostname = '127.0.0.1'; const port = 3000; const server = http.createServer((req, res) => { res.statusCode = 200; res.setHeader('Content-Type', 'text/plain'); res.end(JSON.stringify(colors.getRandomColor())); // Convert object to string here }); server.listen(port, hostname, () => { console.log(`Server running at http://${hostname}:${port}/`); });It's will solved for you.
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