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npm publish

Learn to publish packages with npm publish.

npm publish

npm publish uploads your package to the npm registry. Once published, anyone in the world can download it with npm install.

Before publishing you must log in with npm login. The name and version fields in package.json are required, and version must be unique for each publish. A second publish with the same name and version is rejected. To publish a new version, first bump it with npm version patch (or minor/major), then run npm publish. This way your package is updated over time and users get the new versions.

npm version

The npm version command bumps the version in package.json and creates a git tag. npm version patch bumps the patch number (for example 1.2.3 to 1.2.4), npm version minor bumps the minor number (1.2.3 to 1.3.0), and npm version major bumps the major number (1.2.3 to 2.0.0).

This command is the standard way to update the version before publishing. Thanks to the tag, every version is marked in git and easy to find when rolling back. After running npm version, you upload the new version with npm publish. This keeps version management standard and traceable.

Practice Print in name@version format

Define a string named content with the value {"name":"my-lib","version":"1.2.3"}. Parse it into an object with JSON.parse. Print pkg.name + "@" + pkg.version with console.log.

Starter code

index.js
// Define the package.json content (with name and version)
// Parse it into an object with JSON.parse
// Print in name@version format
// write here

Sample solution

index.js
const content = '{"name":"my-lib","version":"1.2.3"}';
const pkg = JSON.parse(content);
console.log(pkg.name + "@" + pkg.version);

Expected output

my-lib@1.2.3

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 Complete the publish command

Question 
npm ____
Answer 
npm publish

Explanation: npm publish uploads the package to the registry.

2 What must be unique when running npm publish?

index.js
npm publish
  • The package description
  • The package name and version Correct answer
  • The author name
  • The license

Explanation: A package with the same name and version cannot be published twice.

3 Match each command to its action

Term Meaning
npm publish Uploads the package
npm login Logs into the account
npm version Bumps the version
npm whoami Returns the username

All lessons in Intermediate

1 Events

  1. EventEmitter
  2. on and emit
  3. once
  4. removeListener
  5. error event
  6. Summary - Events

2 Streams

  1. What are streams?
  2. Readable stream
  3. Writable stream
  4. pipe
  5. Transform stream
  6. Summary - Streams

3 HTTP server

  1. http.createServer
  2. Request and response
  3. Routing
  4. JSON response
  5. Query string
  6. Summary - HTTP server

4 Project: Helper library

  1. Module design
  2. String helpers
  3. Number helpers
  4. Date helpers
  5. Putting it together

5 Express basics

  1. What is Express?
  2. express()
  3. app.get
  4. app.post
  5. app.listen
  6. Summary - Express basics

6 Middleware

  1. What is middleware?
  2. app.use
  3. Router middleware
  4. Error middleware
  5. Body parser
  6. Summary - Middleware

7 Routing

  1. Route parameters
  2. Query parameters
  3. express.Router
  4. Route groups
  5. Method chaining
  6. Summary - Routing

8 Project: Quiz app

  1. Quiz model
  2. Adding questions
  3. Running the quiz
  4. Score calculation
  5. Putting it together

9 Async patterns

  1. Async iteration
  2. Async generators
  3. Concurrency limit
  4. Retry pattern
  5. Debounce and throttle
  6. Summary - Async patterns

10 Buffer and binary

  1. What is Buffer?
  2. Buffer.from
  3. Buffer.concat
  4. toString and encoding
  5. Buffer slice
  6. Summary - Buffer

11 Process and CLI

  1. process.argv
  2. process.env
  3. process.exit
  4. process.stdin/stdout
  5. Child process
  6. Summary - Process

12 Project: Library API

  1. Model design
  2. Express app
  3. CRUD routes
  4. Middleware
  5. Putting it together

13 npm and packages

  1. npm install
  2. package.json scripts
  3. devDependencies
  4. Semver
  5. npm publish
  6. Summary - npm

14 Error handling

  1. The Error class
  2. try/catch
  3. Custom errors
  4. Error middleware
  5. Unhandled rejection
  6. Summary - Error handling

15 Testing basics

  1. node:test
  2. assert
  3. describe and it
  4. Before and after
  5. Mock
  6. Summary - Testing basics

16 Debugging

  1. node inspect
  2. Chrome DevTools
  3. console methods
  4. util.inspect
  5. Source maps
  6. Summary - Debugging

17 Date and time

  1. The Date object
  2. Date methods
  3. Intl.DateTimeFormat
  4. performance.now
  5. setTimeout and setInterval
  6. Summary - Date and time

18 Crypto

  1. crypto module
  2. createHash
  3. randomBytes
  4. HMAC
  5. AES
  6. Summary - Crypto

19 URL and query string

  1. URL object
  2. URLSearchParams
  3. URL properties
  4. URL.resolve
  5. querystring
  6. Summary - URL and query string

20 Intermediate final

  1. Project design
  2. Express API
  3. fs persistence
  4. Middleware
  5. Putting it together