How to check which version of v8 is installed with my NodeJS?

node.js V8

node.js Problem Overview

How is V8 installed along with NodeJs? What version is my current V8 engine?

node.js Solutions

Solution 1 - node.js

One-line solution:
node -p process.versions.v8

Alternative solution:
node -e "console.log(process.versions.v8)"

Solution 2 - node.js

Easy way:
Type in command line: node -p process.versions.v8

Hard way:

Type node --version to get the Node.js version.
Go to the Node.js Changelogs.
Find and open an appropriate Node.js version change log.
Look for notes containing V8 to.

Solution 3 - node.js

Just run npm version (don't know since when this is available)

> npm version
{ http_parser: '1.0',
  node: '0.10.35',
  v8: '3.14.5.9',
  ares: '1.9.0-DEV',
  uv: '0.10.30',
  zlib: '1.2.8',
  modules: '11',
  openssl: '1.0.1j',
  npm: '1.4.28',
  xsjs: '0.1.5' }

Solution 4 - node.js

To check your version, check the value in process.versions in the REPL.

node -e "console.log(process.versions.v8);"

Additionally, you can compile node with other versions of V8 if you desire. Obviously results may vary widely here depending on what versions you choose.

cd node-v0.x.x
rm -rf deps/v8
git clone http://github.com/v8/v8.git deps/v8

./configure
make
make install

Solution 5 - node.js

You can just type:

node -p process.versions.v8

Solution 6 - node.js

Just for fun, if you have curl available in your terminal, the following should give you v8's version:

V=`cat /usr/include/node/node_version.h | grep -E '^\#define NODE_(MAJOR|MINOR|PATCH)_VERSION' | sed -e 's/^[^0-9]*//'`; V=`echo $V | sed -e 's/ /\./g'`; URL=https://github.com/joyent/node/raw/v$V/ChangeLog; curl --silent $URL | grep 'Upgrade v8' | head -1 | sed -e 's/^.* //'; unset V; unset URL

For example, in my box with node.js 0.4.7 I get:

3.1.8.10

Solution 7 - node.js

find the installed v8 version with node.

$ node
> process.versions.v8
'5.1.281.83'
>

where The process object is a global that provides information about, and control over, the current Node.js process.

if you just type process in node repl, you see information about node(i.e. node version,v8 version,platform,env variables info etc.)

Solution 8 - node.js

If you're on Node.js version 7.7.3 or similar the command is

$ node -p "process.versions"

But those above work fine too.

Solution 9 - node.js

node -pe 'this.process.versions'     # all versions
node -pe 'this.process.versions.v8'  # v8 version

Solution 10 - node.js

The other answers are great for checking your current version. There's also a table with all Node.js versions here: https://nodejs.org/en/download/releases/. Excerpt for example:

Version	            Date	    V8	        npm	    NODE_MODULE_VERSION
Node.js 11.0.0		2018-10-23	7.0.276.28	6.4.1	67
Node.js 10.13.0	    2018-10-30	6.8.275.32	6.4.1	64
Node.js 10.12.0		2018-10-10	6.8.275.32	6.4.1	64

Solution 11 - node.js

You can also checking any nodejs v8 version using docker, like node 10.7.0 :

docker run --rm -it node:10.7.0 bash -c "node -p process.versions"

Solution 12 - node.js

v8 is bundled with Node.js. You can see what version of v8 any version of Node.js is using and when it went into production by viewing the v8 ChangeLog from the node repository. This is current master (if building from source): https://github.com/nodejs/node/commits/master/deps/v8/ChangeLog

To view for a specific version of Node.js, switch the branch to that version and check the ChangeLogs file history.

Solution 13 - node.js

Updated:

C:\Users\Liu.D.H>C:\Users\Liu.D.H\AppData\Roaming\nvm\v16.14.2\node -p process.versions
{
  node: '16.14.2',
  v8: '9.4.146.24-node.20',
  uv: '1.43.0',
  zlib: '1.2.11',
  brotli: '1.0.9',
  ares: '1.18.1',
  modules: '93',
  nghttp2: '1.45.1',
  napi: '8',
  llhttp: '6.0.4',
  openssl: '1.1.1n+quic',
  cldr: '40.0',
  icu: '70.1',
  tz: '2021a3',
  unicode: '14.0',
  ngtcp2: '0.1.0-DEV',
  nghttp3: '0.1.0-DEV'
}

C:\Users\Liu.D.H>nvm use 18.0.0
Now using node v18.0.0 (64-bit)

C:\Users\Liu.D.H>node -p process.versions
{
  node: '18.0.0',
  v8: '10.1.124.8-node.13',
  uv: '1.43.0',
  zlib: '1.2.11',
  brotli: '1.0.9',
  ares: '1.18.1',
  modules: '108',
  nghttp2: '1.47.0',
  napi: '8',
  llhttp: '6.0.4',
  openssl: '3.0.2+quic',
  cldr: '41.0',
  icu: '71.1',
  tz: '2022a',
  unicode: '14.0',
  ngtcp2: '0.1.0-DEV',
  nghttp3: '0.1.0-DEV'
}

C:\Users\Liu.D.H>

Content Type	Original Author	Original Content on Stackoverflow
Question	Lalith	View Question on Stackoverflow
Solution 1 - node.js	user748221	View Answer on Stackoverflow
Solution 2 - node.js	alienhard	View Answer on Stackoverflow
Solution 3 - node.js	Peter Dotchev	View Answer on Stackoverflow
Solution 4 - node.js	Ben Taber	View Answer on Stackoverflow
Solution 5 - node.js	Gaui	View Answer on Stackoverflow
Solution 6 - node.js	Mariano Iglesias	View Answer on Stackoverflow
Solution 7 - node.js	Siyaram Malav	View Answer on Stackoverflow
Solution 8 - node.js	user5683940	View Answer on Stackoverflow
Solution 9 - node.js	Vadim	View Answer on Stackoverflow
Solution 10 - node.js	ZachB	View Answer on Stackoverflow
Solution 11 - node.js	Geng Jiawen	View Answer on Stackoverflow
Solution 12 - node.js	cchamberlain	View Answer on Stackoverflow
Solution 13 - node.js	Donghua Liu	View Answer on Stackoverflow