how to update all package version number in package.json when use `npm update`？

Question

when i use npm update , i can update all package , but package version number in package.json not change , in the package.json , have devDependencies and dependencies , like this :

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "jquery": "^1.11.2"
  },
  "devDependencies": {
    "lodash": "^2.4.1"
  }
}

how to use one line command update all package and all package numbner in devDependencies and dependencies will update too.

Answer 1

One easy step:

$ npm i -g npm-check-updates && ncu -a && npm i

That is all. All of the package versions in package.json will be the latest.

Answer 2

From npm documentation:

When you want to update a package and save the new version as the minimum required dependency in package.json, you can use:

npm update -S

or

npm update --save

Also As with all commands that install packages, the --dev flag will cause devDependencies to be processed as well. so your desired command is:

npm update --dev --save

Note that npm will only write an updated version to package.json if it installs a new package.