nodejs hexadecimal to string

In Node.js, we can use the Buffer object to convert hexadecimal data into strings.

The Buffer object is a built-in object in the Node.js API, used to process binary data, including data represented in hexadecimal format. We can use the Buffer.from() method to convert hexadecimal data to its corresponding Buffer object and output it as a string. For example, assuming we have a hexadecimal string 48656c6c6f20576f726c64, we can convert it to a string using the following code:

const hexString = '48656c6c6f20576f726c64';
const buf = Buffer.from(hexString, 'hex');
const str = buf.toString('utf8');
console.log(str);

hereBuffer.from()Method converts hexString to hexadecimal and stores the result in the buf variable. Then, we use the buf.toString() method to decode it into a utf8 formatted string. This will output Hello World.

If our hexadecimal data is separated by spaces, we can use the String.prototype.split() method to split it into individual hexadecimal values ​​and use Buffer.from() method converts it to a string. For example, assuming we have a hexadecimal string 48 65 6c 6c 6f 20 57 6f 72 6c 64, we can convert it to a string using the following code:

const hexString = '48 65 6c 6c 6f 20 57 6f 72 6c 64';
const hexArr = hexString.split(' ');
const buf = Buffer.from(hexArr, 'hex');
const str = buf.toString('utf8');
console.log(str);

here The hexString.split(' ') method splits hexString into an array containing each hexadecimal value. We then convert it to a string using the Buffer.from() method.

However, it should be noted that if our hexadecimal data contains illegal characters, it cannot be converted to a string correctly. If we try to convert the following string 48656c6c6f20576f726c6447 to a string, an error occurs because it contains an illegal hexadecimal character 47:

const hexString = '48656c6c6f20576f726c6447';
const buf = Buffer.from(hexString, 'hex');
const str = buf.toString('utf8');
console.log(str); // 报错

In this case, we can avoid the program crash by using an error handler when calling the Buffer.from() method. For example, we can use the following code:

const hexString = '48656c6c6f20576f726c6447';
let str;
try {
  const buf = Buffer.from(hexString, 'hex');
  str = buf.toString('utf8');
} catch (err) {
  console.error(err);
  str = '';
}
console.log(str); // 输出空字符串

The try..catch block here catches errors from the Buffer.from() method and str Set to an empty string to prevent the program from crashing. We can adjust the exception handler appropriately according to the specific situation.

In short, converting hexadecimal data to string is a common task in Node.js, and we can use the related functions of the Buffer object to complete this work.

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