Introduction to module paths in Node.js

This article brings you an introduction to the module path in Node.js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Third-party modules

• Import third-party modules and core modules. There is no need to specify a path. Just write the module name. Yes;

• When importing third-party modules, it will be searched from the "node_modules" directory in the root directory. If not, it will be searched from the "node_modules" in the previous directory. Search in and go directly to "node_modules" in the root directory

// Import third-party modules

const randomatic = require("randomatic");

2. Custom modules

(1) Import custom module-file module

*** is the name of the custom module
a. The file does not specify a suffix, and "***" is loaded first "
b. No "***", load "***.js"
c. No "***.js", load "***.json"
d. None" ***.json", load "***.node"

main module.js

const myModules = require("./my-modules/自定义模块");
myModules();

// 当没有后缀名时
const myModules2 = require("./my-modules/自定义模块");
myModules2();

// json文件
const myModules3 = require("./my-modules/自定义模块");
console.log(myModules3);

(2) Import custom module-directory as module

a . If there is package.json in the directory and main is specified, the specified file will be used as the entry point of the module
b. If main is not specified or there is no package.json, index.js will be loaded by default

(3). If Index.js is useless, try to load index.node

main module.js

const myModules4 = require("./indexModule");
myModules4();

package.json

{
  "name":"Json格式",
  "main":"./indexModule.js"
}

indexModules.js

module.exports = function () {
    console.log("我是目录package默认设置的文件");
}

Summary:

(1) Those starting with "./", "../", "/" are custom modules, those without these are core modules and third-party modules

(2) To import third-party modules and core modules, there is no need to specify a path, just write the template name

(3) To import third-party modules and core modules, there is no need to specify a path, just write the module name;

(4) When importing a third-party module, it will be searched from the "node_modules" directory in the root directory. If not, it will be searched from the "node_modules" in the previous directory and go directly to the "node_modules" in the root directory

(5) Import the custom module. If the module is a file and there is no file with the same name, the suffix will be added in sequence, ".js", ".json", ".node"

(6) Import a custom module, the module is a directory, import the specified directory name

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