Is npm !== npx

Recently when I started getting into React I saw a lot of people (including myself) getting confused when seeing npx instead of the very well known npm.

Some of us found it weird but didn’t give much thought, others thought it was a typo and even went into the trouble of “fixing” it by running npm instead of npx.

When I see something happening more than once, I consider it as being worth to be explained. That’s why this article, to all who had the same misunderstanding as me.
what is the NPM?
As we might already know, npm is a package manager for Node.js whose goal is automated dependency and package management.

It means that we can specify all our dependencies (packages) for a project in the package.json file and whenever someone has to install the dependencies for it, they should just run npm install and voila!

It also provides versioning i.e. it makes it possible to specify which versions of the dependencies our project depends upon, so we can, for the most part, prevent updates from breaking our project or use our preferred version.
what is NPX?
What npx does is the following:
By default, it first checks if the package that is to be executed exists in the path (i.e. in our project);
If it does, it executes it;
Else, means that the package has not been installed, so npx installs its latest version and then executes it;
This behavior, that is explained above, is the default one of npx, but it has flags that can be used to prevent it.

For example, if we run npx some-package --no-install means that we’re telling npx that it should only try to execute the package named some-package, without installing it if it has not been installed before.

Example
Let’s say we have a package named some-package and we want to execute it.
Well, without npx, to execute a package we would have to do it by running it from its local path, like this:

package.json file while become this shape.
{
“name”: “something”,
“version”: “1.0.0”,
“scripts”: {
“some-package”: “./node_modules/bin/some-package”
}
}

to run it in npm npm run some-package.
in npx .npx some-package

#npm #npx #js #javascript

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Buddha Community

Is npm !== npx

Is npm !== npx

Recently when I started getting into React I saw a lot of people (including myself) getting confused when seeing npx instead of the very well known npm.

Some of us found it weird but didn’t give much thought, others thought it was a typo and even went into the trouble of “fixing” it by running npm instead of npx.

When I see something happening more than once, I consider it as being worth to be explained. That’s why this article, to all who had the same misunderstanding as me.
what is the NPM?
As we might already know, npm is a package manager for Node.js whose goal is automated dependency and package management.

It means that we can specify all our dependencies (packages) for a project in the package.json file and whenever someone has to install the dependencies for it, they should just run npm install and voila!

It also provides versioning i.e. it makes it possible to specify which versions of the dependencies our project depends upon, so we can, for the most part, prevent updates from breaking our project or use our preferred version.
what is NPX?
What npx does is the following:
By default, it first checks if the package that is to be executed exists in the path (i.e. in our project);
If it does, it executes it;
Else, means that the package has not been installed, so npx installs its latest version and then executes it;
This behavior, that is explained above, is the default one of npx, but it has flags that can be used to prevent it.

For example, if we run npx some-package --no-install means that we’re telling npx that it should only try to execute the package named some-package, without installing it if it has not been installed before.

Example
Let’s say we have a package named some-package and we want to execute it.
Well, without npx, to execute a package we would have to do it by running it from its local path, like this:

package.json file while become this shape.
{
“name”: “something”,
“version”: “1.0.0”,
“scripts”: {
“some-package”: “./node_modules/bin/some-package”
}
}

to run it in npm npm run some-package.
in npx .npx some-package

#npm #npx #js #javascript

Modesto  Bailey

Modesto Bailey

1596739800

NPM Install and NPM CI: In What Aspect They Differ

Nodejs web development has achieved such a huge acclamation all over the world just because of its large ecosystem of libraries known as NPM modules. It is the largest software package library in the world, with over 500,000+ packages. Each time a Command Line Interface (CLI) for npm comes as an add-on with Nodejs installation which allows developers to connect with packages locally on their machine.

The idea of npm modules had come with some technical advancement in package management like reusable components, with easy installation via an online repository, with version and dependency management.

In general,NPM is a default package manager for every Nodejs development project. Npm eases the installing and updating dependencies processes. A dependency list on npmjs even provides you with the installation command, so that you can simply copy and paste in the terminal to initiate installation procedures.

All npm users have an advantage of a new install command called “npm ci(i.e. npm continuous integration)”. These commands provide enormous improvements to both the performance and reliability of default builds for continuous integration processes. In turn, it enables a consistent and fast experience for developers using continuous integration in their workflow.

In npm install, it reads the package.json to generate a list of dependencies and uses package-lock.json to know the exact version of these dependencies to install. If the dependency is found in package-lock.jso, it will be added by npm install.

Whereas here, the npm ci (continuous integration) installs dependencies from package-lock.json directly and use up package.json just to verify that there are no mismatched versions exists. If any dependencies mismatching versions, it will show an error.

#npm-install #npm-ci #npm #node-package-manager

Jim Yuan  Hang

Jim Yuan Hang

1579073902

NPM vs. NPX

Introduction

We all are using npm as our package manager. It is easy, right? But with the version npm@5.2.0, when you install the npm, it installs a new package called npx. Have you ever thought about what it is? And why it is needed? Are there any benefits of using npx instead of npm? I know you were trying to find the answer for the above questions and at the end, you landed up on this page. I will try to answer these questions for you. And at the end of the article, I am sure that you will get the answer to your questions. I hope you will find this post useful.

What we are going to do

We will be creating two applications and installing the mocha package in both applications so that we can run some tests.

  1. mocha-example-npm
  2. mocha-example-npx

This is image title

npm-npx

Coding with mocha-example-npm application

Let’s try to create a new folder named mocha-example-npm and open it in my favorite code editor, which is vscode. Once you open the folder, you can install mocha by running this command.

  1. npm install mocha
    Let’s create a folder called test.

  2. mkdir test
    Let’s create a file called test.js.

    code test/test.js

And paste the below sample test in it.

var assert = require('assert');  
describe('Array', function() {  
    describe('#indexOf()', function() {  
        it('should return -1 when the value is not present', function() {  
            assert.equal([1, 2, 3].indexOf(4), -1);  
        });  
    });  
});  

By seeing the code, you might have already found that the test will pass the indexOf (4) as -1. Now how do we check this? So to run the test we need to run mocha right? Let’s do it.

If you just type mocha in the terminal, you will get an error as below.

  1. mocha - The term ‘mocha’ is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1  
+ mocha  
+ ~~~~~  
+ CategoryInfo : ObjectNotFound: (mocha:String)[], CommandNotFoundException  
+ FullyQualifiedErrorId : CommandNotFoundException  

It is saying that mocha is not a recognized command. To fix this you have three options below.

  • Install mocha globally, so that the command will be recognized globally
npm@6.1.0 C:\Program Files(x86)\nodejs\node_modules\npm  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npm\mocha-example-npm> npm i mocha -g  
C:\Users\Sibeesh\AppData\Roaming\npm\mocha -> C:\Users\Sibeesh\AppData\Roaming\npm\node_modules\mocha\bin\mocha  
C:\Users\Sibeesh\AppData\Roaming\npm\_mocha -> C:\Users\Sibeesh\AppData\Roaming\npm\node_modules\mocha\bin\_mocha  
+ mocha@5.2.0  
added 24 packages from 436 contributors in 3.458s  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npm\mocha-example-npm> npm list -g mocha  
C:\Users\Sibeesh\AppData\Roaming\npm  
`-- mocha@5.2.0  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npm\mocha-example-npm> mocha  
Array  
#indexOf()  
√ should return -1 when the value is not present  
1passing(14ms)  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npm\mocha-example-npm>  
  • Use the path to mocha from node_modules

    ./node_modules/mocha/bin/mocha

  • Configure test in your package.json file as follows.

"scripts":{  
   "test":"mocha"  
}  
So that you can run _npm test_ command, and it will take the mocha files from your node_modules folder.

Coding with mocha-example-npx application

So, we have understood the problem we have using npm and we have three solutions to fix it. Now, let’s try using the npx instead of npm. Let’s open the folder and run npx mocha. The result is a warning as it is trying to find the folder test in the solution and then the tests.

  1. npx: installed 24 in 6.203s
  2. Warning: Could not find any test files matching pattern: test
  3. No test files found

Let’s create a test folder, test.js file and write a test in it.

PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> mkdir test  
Directory: F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx  
Mode LastWriteTime Length Name  
---- ------------- ------ ----  
d----- 20-10-201806:26 PM test  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> code test/test.js  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx>  

Let’s run the command npx mocha now, and you will get the output as below.

PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> npx mocha  
npx: installed 24 in 4.142s  
Array  
#indexOf()  
√ should return -1 when the value is not present  
1passing(12ms)  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> 

As you can see that our tests are passed. But are you seeing any node_modules folder or any packages are being added to your solution?

What is npx?

Now, let’s just summarize what npx is. It is an npm package runner. We all know that we are installing the packages to our solution from the location called npm registry and using it. And the npx has been designed in a way that we can directly use the package from the npm registry without even installing it in our solution. You may be thinking why is it needed?

Let me give you an example, as I mentioned in the background section of this article, we can create a simple React application with the help of Create-React-App from FaceBook. And this is used only for creating the application, and once we create the application, we no longer need this. If you use npm, you will have to install this package either globally or locally before you use this, or else you will get an error.

Wouldn’t it be good, if we could just use this create-react-app package from the npm registry and create the application in our local machine? And that’s where npx comes in. With the help of npx, we can reduce the size of our node_modules and I strongly believe that this is a huge benefit.

It is smart enough to identify whether the package you are trying to get from the npm registry is already there in your machine, either globally or locally. If the package is available in your machine, it will take it from there.

What if mocha is installed globally or locally and we run the command npx mocha?

Let’s try to install mocha globally and run the command npx mocha. Before that, let’s just make sure that we haven’t installed mocha yet.

PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> npm list mocha  
mocha-example-npx@1.0.0 F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx  
`-- (empty)  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> npm list -g mocha  
C:\Users\Sibeesh\AppData\Roaming\npm  
`-- (empty)  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx>  

Now, let’s just install mocha globally

PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> npm i mocha -g  
C:\Users\Sibeesh\AppData\Roaming\npm\mocha -> C:\Users\Sibeesh\AppData\Roaming\npm\node_modules\mocha\bin\mocha  
C:\Users\Sibeesh\AppData\Roaming\npm\_mocha -> C:\Users\Sibeesh\AppData\Roaming\npm\node_modules\mocha\bin\_mocha  
+ mocha@5.2.0  
added 24 packages from 436 contributors in 3.033s

Try to run npx mocha again,

PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx> npx mocha  
Array  
#indexOf()  
√ should return -1 when the value is not present  
1passing(12ms)  
PS F:\SibeeshPassion\Articles\NPMvsNPX\npx\mocha-example-npx>  

You are not getting any information related to the installation (for example npx: installed 24 in 4.142s).

Conclusion

Thanks a lot for reading. I will come back with another post on the same topic very soon. Did I miss anything that you may think is needed? Did you find this post useful? I hope you liked this article. Please share with me your valuable suggestions and feedback.

Source Code

The source code can be found here.

#node-js #npm #npx #react

Billy Chandler

Billy Chandler

1597203534

Publishing an NPX Command to NPM

npx is an useful tool to run one-off commands like create-react-app, http-server etc.

In this post I’ll go through the steps needed to create a command line tool that can be invoked using npx.

Let’s start with a simple hello world script

console.log("hello world");

This prints “hello world” when you run it

$ node index.js
hello world

#npm #npx #node #developer

NPX vs NPM: What's the Difference?

Do you always get confused between NPX and NPM? We have compiled an interesting NPX vs NPM comparison to make you understand better.

If you have ever worked around with JavaScript, then you must have probably heard about NPM, and NPX. You have may have made use of them to install something. In this article, we will demonstrate you what they are, the differences between NPX and NPM , and the many factors it entails.

Now, before diving straight into having an NPX vs NPM comparison, let us first understand each one of them individually. One of the most fascinating, prominent, and popular languages out there undoubtedly is JavaScript. So, anytime there’s a new term floating around in the programming world, it’s probably JavaScript related. NPX is one such buzz phrase.

However, you have to make sure that you do not get confused with similar stuff out there. In such a case, we would like to clarify briefly what Node and NPM are and how they differ.




#javascript #javascript #npm #npx #node