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I want to know which javascript version is my NodeJS is supporting ?

Dexter
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5 Answers5

26

Use process.versions. From that page in the documentation:

console.log(process.versions);

outputs

{ node: '0.4.12',
  v8: '3.1.8.26',
  ares: '1.7.4',
  ev: '4.4',
  openssl: '1.0.0e-fips' }

EDIT: V8 uses the ECMAScript as specified in ECMA-262, 5th edition.

Reference: http://code.google.com/p/v8/

Anirudh Ramanathan
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    None of those describe the implemented version of JS. – Quentin Jul 29 '12 at 08:14
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    Isn't the v8 engine's version what the OP is looking for? I have edited answer to add the JS-version. But that is not subject to change and hence need not be queried. – Anirudh Ramanathan Jul 29 '12 at 08:15
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    I am looking for the Javascript version the NODEJS is supported, some of the links in the NODEJS Manual are directed to [https://developer.mozilla.org/en/JavaScript] – Dexter Jul 29 '12 at 09:16
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    @DSK If you're expecting one of [Mozilla's JavaScript versions](https://developer.mozilla.org/en/JavaScript/New_in_JavaScript), those are specific to Mozilla's own product development (Gecko, SpiderMonkey, etc.) and aren't actually relevant to Google's V8 or NodeJS beyond some versions being legacy. ECMAScript 5.1 is the [current standard version](https://developer.mozilla.org/en/JavaScript): "*The JavaScript standard is ECMAScript. As of 2012, all modern browsers fully support ECMAScript 5.1.*" – Jonathan Lonowski Jul 29 '12 at 12:35
7

According to its documentation, this command could be used;

node -p process.versions.v8
Kerem
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7

Run this script:

try {
  var k = new Map();
  console.log("ES6 supported!!")
} catch(err) {
  console.log("ES6 not supported :(")
}

try {
  var k = new HashMap();
  console.log("ES100 supported!!")
} catch(err) {
  console.log("ES100 not supported :(")
}
Deepak
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6

The best and most detailed version intel is at https://node.green. It shows a matrix of NodeJS version by JavaScript version. The JavaScript items include the standard name and each js feature. The node version includes the V8 version (hover over the node column header).

beencodingawhile
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3

Not trying to necropost, here -- however, this seems to be the way to accomplish this...it is a bit convoluted, however.

What I did was -- follow the method outlined here and then added some of my own...

node -p process.versions

{ http_parser: '2.8.0',
  node: '11.2.0',
  **v8: '7.0.276.38-node.11'**,
  uv: '1.23.2',
  zlib: '1.2.11',
  ares: '1.15.0',
  modules: '67',
  nghttp2: '1.34.0',
  napi: '3',
  openssl: '1.1.0i',
  icu: '63.1',
  unicode: '11.0',
  cldr: '34.0',
  tz: '2018e' }

Then, it depends on your platform -- I have node running on Windows 10, so...

node --v8-options | find "in progress"

For Linux use...

node --v8-options | grep "in progress"

  --harmony-do-expressions (enable "harmony do-expressions" (in progress))
  --harmony-class-fields (enable "harmony fields in class literals" (in progress))
  --harmony-static-fields (enable "harmony static fields in class literals" (in progress))
  --harmony-await-optimization (enable "harmony await taking 1 tick" (in progress))
  --harmony-locale (enable "Intl.Locale" (in progress))
  --harmony-intl-list-format (enable "Intl.ListFormat" (in progress))
  --harmony-intl-relative-time-format (enable "Intl.RelativeTimeFormat" (in progress))

V8 implements ECMAScript as defined in ECMA-262-- I am unaware of any way to relate that to any other 'version', however -- it will tell you what features are still in development.

If you omit the pipe to grep/find, you get a long list of all v8 options available.

Finally, I am not actually developing the Node application for use on my Windows 10 machine -- I am developing the Node application for a Raspberry Pi and using Visual Studio Code to ssh, so -- at my terminal prompt, I ssh into the RPi and use the Linux version above...

node -p process.versions

{ http_parser: '2.8.0',
  node: '8.11.3',
  v8: '6.2.414.54',
  uv: '1.19.1',
  zlib: '1.2.11',
  ares: '1.10.1-DEV',
  modules: '57',
  nghttp2: '1.32.0',
  napi: '3',
  openssl: '1.0.2o',
  icu: '60.1',
  unicode: '10.0',
  cldr: '32.0',
  tz: '2017c' }

node --v8-options | grep "in progress"

--harmony_array_prototype_values (enable "harmony Array.prototype.values" (in progress))
--harmony_function_sent (enable "harmony function.sent" (in progress))
--harmony_do_expressions (enable "harmony do-expressions" (in progress))
--harmony_class_fields (enable "harmony public fields in class literals" (in progress))
--harmony_promise_finally (enable "harmony Promise.prototype.finally" (in progress))
--harmony_number_format_to_parts (enable "Intl.NumberFormat.prototype.formatToParts" (in progress))
--harmony_plural_rules (enable "Intl.PluralRules" (in progress))
jinzai
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