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This article mainly introduces how to detect the existence of files in the fs module of node. The article is very detailed and has certain reference value. Interested friends must read it!

Detection methods: 1. Use the statement "const fs = require("fs");" to introduce the fs module;2. Use the exists() method of the fs module to detect whether the specified file exists in the file system, with the syntax "fs.exists( path,callback)."

This tutorial operating environment: Windows 7 system, nodejs version 12.19.0, DELL G3 computer.

First, you need to introduce the fs module.

const fs = require("fs");

2. Use fs module for detection

fs.exists(filePath, (exists) => { if (exists) { console.log("File already exists"); } else { console.log("File does not exist"); }});

Description:

The fs.exists() method is the fs module's built-in application programming interface, which provides an API for interacting with file systems in a tightly modeled manner around standard POSIX functions. The fs.exists() method tests whether a given path exists in the file system.

Usage:

fs.exists( path, callback )

Parameters: The method accepts two parameters described above and below:

path: Path to test for directory existence. It can be a string, buffer, etc.

callback: This is a callback function passed to the exists() method.

Return Value: It returns a Boolean value indicating that the path exists or does not exist.

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