Buffer error in nodejs

Node.js is a modern JavaScript runtime environment and one of the core tools for many applications. Among them, Buffer is an important data type in Node.js. It is used to operate binary data and is one of the foundations for Node.js to handle I/O operations. However, in Node.js, various errors will appear in Buffer. How to solve these problems?

1. Error 1: TypeError: Argument must be a string or Buffer

This error means that the parameter passed into the function must be a string or Buffer type, but the actual parameter passed in The parameters entered are not. This error usually occurs when operating on Buffer objects.

Solution:

• Confirm whether the incoming parameter type is correct. You can use typeof or instanceof to judge.
• If the incoming parameter is of string type, you can call the Buffer.from() method to convert it to the Buffer type.
• If the incoming parameter is a non-string or non-Buffer type, you can convert it to a string first and then perform the operation.

Sample code:

let str = 'hello world';
let buffer = Buffer.from(str);

2. Error 2: TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be one of type string or Buffer

The reason for this error is that some of the built-in methods of Node.js have requirements for the data type passed in, but the data type passed in does not meet the requirements.

Solution:

• Confirm the data type required by the function and check whether the incoming data type meets the requirements.
• If the data type passed in does not meet the requirements, you can convert it to the correct type before passing it in.

Sample code:

const fs = require('fs');
const path = require('path');

let filePath = path.resolve(__dirname, 'file.txt');
let data = 'hello world';

fs.writeFile(filePath, Buffer.from(data), (err) => {
   if(err) throw err;
   console.log('File has been saved.');
});

3. Error 3: RangeError: Invalid typed array length

The reason for this error is that when creating TypedArray, The parameter passed in exceeds its maximum supported length.

Solution:

• Confirm whether the incoming parameters exceed the maximum length supported by TypedArray.
• If the maximum length supported by TypedArray is exceeded, you can try to create TypedArray in segments.

Sample code:

let data = new Uint8Array(10000000000); // 报错：RangeError: Invalid typed array length

const chunkSize = 5000000;
let buffer = new Buffer(chunkSize);

for(let i = 0; i < 10000000000; i += chunkSize){
    let array = new Uint8Array(buffer);
    // ...
}

4. Error 4: TypeError: Cannot read property 'byteLength' of undefined

This error usually occurs when using TypedArray, because the TypedArray object must be associated with the ArrayBuffer instance, if it is used without association, an error will be reported.

Solution:

• Confirm whether the TypedArray object used is associated with an ArrayBuffer instance.
• If it is not associated, you can create an ArrayBuffer instance and associate it with TypedArray before using it.

Sample code:

const length = 10;
let uint8 = new Uint8Array(length).buffer; // 此时 uint8 不是 TypedArray 对象
let uint8Typed = new Uint8Array(uint8); // 报错：TypeError: Cannot read property 'byteLength' of undefined

const buffer = new ArrayBuffer(length);
uint8Typed = new Uint8Array(buffer); // 关联 ArrayBuffer 实例后再使用

Summary:

Through the above cases, we have learned about common Buffer errors and solutions in Node.js. In the actual development process, we need to analyze and solve according to the specific situation, and follow the principles of safety first and practicality first. At the same time, we also need to pay attention to the version number of Node.js and follow standard API usage specifications to avoid unnecessary errors caused by API changes.

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