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nodejs outputs Chinese garbled characters

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Release： 2023-05-16 20:39:09

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Node.js is a JavaScript runtime based on the Chrome V8 engine. One of its advantages is the ease with which JavaScript can be used to build server-side applications, making it a popular choice for building web applications. However, when using Node.js to output Chinese characters, you sometimes encounter the problem of garbled characters.

There are many reasons why Node.js outputs Chinese garbled characters. Below we will list some possible reasons and solutions.

Encoding issues

Node.js uses UTF-8 encoding by default, but in some cases other encoding methods may be used, resulting in garbled characters when outputting Chinese characters.

Solution: You can use the console.log() function, and use the Buffer method to convert the character set to be output to UTF-8 before outputting.

console.log(Buffer.from('Hello World', 'utf8').toString('hex')); // e6849fe696873a20476f726c64

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Terminal display problem

Some terminals cannot correctly display the input characters if the character set is not set, resulting in garbled characters when outputting Chinese characters.

Solution: Set the character set in the terminal, for example, use the chcp 65001 command in the Windows command prompt. If you're using Mac OS or Linux, you can choose to use UTF-8 encoding in your terminal's settings.

The encoding method is not specified correctly

When using the built-in fs module of Node.js to read or write a text file, if the encoding method is not specified correctly Specifying the file encoding method will cause garbled characters when outputting Chinese characters.

Solution: Specify the encoding method of the file, for example:

fs.readFile('test.txt', 'utf8', function(err, data) {
  if (err) throw err;
  console.log(data);
});

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HTTP response header does not specify the encoding method

When using Node.js to build the Web When applying a program, if the HTTP response header does not specify the encoding method correctly, garbled characters will appear when outputting Chinese characters.

Solution: Add the character set encoding method in the response header, for example:

res.setHeader('Content-type', 'text/html;charset=utf-8');
res.write('<html><head><title>你好</title></head><body>你好</body></html>');
res.end();

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Summary:

The above are some of the current reasons that may cause Node.js to output Chinese garbled characters and solutions. You need to pay attention to these issues during development and adopt correct processing methods when outputting Chinese characters.

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