Extract version from package.json (NPM) using bash / shell

get-npm-package-version

# Version key/value should be on his own line
PACKAGE_VERSION=$(cat package.json \
  | grep version \
  | head -1 \
  | awk -F: '{ print $2 }' \
  | sed 's/[",]//g')

echo $PACKAGE_VERSION

Here is how I get the lockfile version in my bash script...

lockfile_version="$(node -pe "require(\"$directory/package-lock.json\").lockfileVersion" )"

node --print 'require("./package.json").version'

sed -n 's/.*"version": *"\([^"]*\)".*/\1/p' package.json

node --eval 'process.stdout.write(require("./package.json").version)'

I just wanted to add an alternative solution I came up with: https://github.com/optum/semver-cli

This is a tool dedicated to getting/setting/incrementing semantic versions. It also has the ability to synchronize various code files as you increment which then makes it easier to access the version from code in different ways.

.github/version.yml

on:
  post:
    - kind: patch
      file: package.json
    - kind: regexp
      pattern: '(?<=export const version = ").*(?=";)'
      file: src/version.js
    - kind: regexp
      pattern: '(?<=example@).*(?=\/main.js)'
      file: README.md

src/version.js

export const version = "0.1.0";

README.md

# Example
```js
import * as example from "[email protected]";
```

package.json

{
  "version": "0.1.0"
}

VERSION

0.1.0

Then to get it from the shell:

VERSION=$(semver get)

To get it in code:

main.js

import { version } from "./src/version.js";
console.log(version);

And packagej.son, package-lock.json, src/version.js, README.md and the VERSION file are all in sync with each other and can be incremented simultaneously with the following command:

semver inc minor

Which will set them all to 0.2.0 of course.

This worked for me
cat package.json | grep \"version\" | cut -d'"' -f 4

node -p -e "require('./package.json').version"

cat package.json | jq -r '.version' works on github actions

Easier:
jq -r .version package.json

real	0m0,021s
user	0m0,020s
sys	0m0,000s

If someone uses image based on ubi-minimal - which doesn't have jq, grep or even sed - use this script:

VERSION=$(cat package.json | tr -d '\n' | tr -d ' ' | cut -d'"' -f4)

grep "version" package.json | ...

grep directly instead of cat?

Thanks for this thread, lots of creative workarounds and useful techniques to be learned here.

However, I think the best option, at least for the OP task, got largely overlooked here. npm show ./ version (as pointed out by @mightyiam among others).

BTW, the actual command AFAICT is npm-view, and there it says that npm has aliased v, show, and info to it.

WARNING: npm show . version and npm show ./ version are different. The . seems to pull from the published repository info (in cache?), where as the ./ actually reads the package.json in the current directory. The latter is the one we want here (at least the OP). So make sure you use npm show ./ version.

FWIW, I have added these two to my ~/.bash_profile:

alias whatver="npm v ./ version"
alias tagver="whatver | xargs git tag && git push --tags"

(I always forget how useful xargs is, until I run across a case like this where it's helpful)

If you already have node installed: node -p "require('./package.json').version"