Examples

# Same as `node` but with Node 12
$ nve 12 node
Welcome to Node.js v12.22.12.
Type ".help" for more information.
> .exit

# Same as `node file.js` but with Node 8
$ nve 8 node file.js

# Any command can be used
$ nve 12 npm test

# Execute a local binary
$ nve 8 ava

# Run a specific version
$ nve 8.10.0 npm test

# Use a version range
$ nve "<8" npm test

# Run the latest Node.js version
$ nve latest npm test

# Run the latest LTS version
$ nve lts npm test

# Run the Node version from `~/.nvmrc` or the current process version
$ nve global npm test

# Run the current directory's Node.js version using its `.nvmrc` or `package.json` (`engines.node` field)
$ nve local npm test

# Run the Node version using a file like `.nvmrc` or `package.json`
$ nve /path/to/.nvmrc npm test

# Use a different mirror for the Node binaries
$ nve --mirror=https://npmmirror.com/mirrors/node 8 npm test

# Do not use the cached list of available Node.js versions
$ nve --fetch 8 npm test

# Always use the cached list of available Node.js versions even if it's more
# than one hour old
$ nve --no-fetch 8 npm test

# Use a different CPU architecture for the Node binaries
$ nve --arch=x32 8 npm test

# Chaining commands
$ nve 8 npm run build && nve 8 npm test

# Cache Node 8 download
$ nve 8 node --version

Examples (multiple versions)

# Run multiple versions
$ nve 12,10,8 npm test

 ⬢  Node 12.22.12

  105 tests passed
  Finished 'test' after 3.8 s

 ⬢  Node 10.24.1

  105 tests passed
  Finished 'test' after 4.2 s

 ⬢  Node 8.17.0

  105 tests passed
  Finished 'test' after 4.5 s

# Do not abort on the first version that fails
$ nve --continue 12,10,8 npm test

# Run all versions in parallel
$ nve --parallel 12,10,8 npm test

# Cache multiple Node downloads
$ nve 12,10,8 node --version

Examples (list versions)

# Prints latest Node.js version
$ nve latest
20.4.0

# Prints latest Node.js 8 version
$ nve 8
8.17.0

# Prints latest Node.js 12, 10 and 8 versions
$ nve 12,10,8
12.22.12
10.24.1
8.17.0

Demo

You can try this library:

either directly in your browser.
or by executing the examples files in a terminal.

Install

npm install -g nve

node >=18.18.0 must be globally installed. However the command run by nve can use any Node version (providing it is compatible with it).

To use this programmatically (from Node.js) instead, please check nvexeca.

Options

–continue

Alias: -c
Type: boolean
Default: false

By default, when running multiple Node versions and one of those versions fails, the others are aborted. This option disables this.

–parallel

Alias: -p
Type: boolean
Default: false

When running multiple Node versions, run all of them at the same time. This is faster. However this does not work if the command:

requires some interactive CLI input (for example using a prompt)
is not concurrency-safe

–progress

Type: boolean
Default: true

Whether to show a progress bar while the Node binary is downloading.

–mirror

Alias: -m
Type: string
Default: https://nodejs.org/dist

Base URL to retrieve Node binaries. Can be overridden (for example https://npmmirror.com/mirrors/node).

The following environment variables can also be used: NODE_MIRROR, NVM_NODEJS_ORG_MIRROR, N_NODE_MIRROR or NODIST_NODE_MIRROR.

–fetch

Alias: -f
Type: boolean
Default: undefined

The list of available Node.js versions is cached for one hour by default. With:

--fetch: the cache will not be used
--no-fetch: the cache will be used even if it’s older than one hour

The default value is undefined (neither of the above). When no COMMAND is specified (only printing the Node.js version), the default value is --fetch instead.

–arch

Alias: -a
Type: string
Default: process.arch

Node.js binary’s CPU architecture. This is useful for example when you’re on x64 but would like to run Node.js x32.

All the values from process.arch are allowed except mips and mipsel.

Initial download

The first time nve is run with a new VERSION, the Node binary is downloaded under the hood. This initially takes few seconds. However subsequent runs are almost instantaneous.

COMMAND can be omitted in order to cache that initial download without executing any commands.

Native modules

If your code is using native modules, nve works providing:

they are built with N-API
the target Node.js version is >=8.12.0 (since N-API was not available or stable before that)

Otherwise the following error message is shown: Error: The module was compiled against a different Node.js version.

Benchmarks

The following benchmarks compare the average time to run nve, nvm exec and npx node:

nve:       295ms
nvm exec:  741ms
npx node: 1058ms

nve