How to check which version of v8 is installed with

问题:

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

回答1:

Type node --version to get the node.js version.

Then go to the node.js changes log to figure which V8 version this node.js version includes.

回答2:

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

回答3:

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' }

回答4:

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

回答5:

You can just type:

node -p process.versions.v8

回答6:

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

回答7:

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

:)

回答8:

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.)

回答9:

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.

回答10:

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

回答11:

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"

回答12:

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.