Cannot start web server: error message: import app from "./instance.mjs"

[sb2050]

Good day,
after running npm start i always get the following error messages:

npm WARN npm npm does not support Node.js v10.21.0
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
npm WARN npm You can find the latest version at https://nodejs.org/

> [email protected] start /root/node/metrics
> node source/app/web/index.mjs

/root/node/metrics/source/app/web/index.mjs:2
  import app from "./instance.mjs"
         ^^^

SyntaxError: Unexpected identifier
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `node source/app/web/index.mjs`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2021-01-17T00_07_36_560Z-debug.log

/root/.npm/_logs/2021-01-17T00_07_36_560Z-debug.log

0 info it worked if it ends with ok
1 warn npm npm does not support Node.js v10.21.0
2 warn npm You should probably upgrade to a newer version of node as we
3 warn npm can't make any promises that npm will work with this version.
4 warn npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
5 warn npm You can find the latest version at https://nodejs.org/
6 verbose cli [ '/usr/bin/node', '/usr/bin/npm', 'start' ]
7 info using [email protected]
8 info using [email protected]
9 verbose run-script [ 'prestart', 'start', 'poststart' ]
10 info lifecycle [email protected]~prestart: [email protected]
11 info lifecycle [email protected]~start: [email protected]
12 verbose lifecycle [email protected]~start: unsafe-perm in lifecycle true
13 verbose lifecycle [email protected]~start: PATH: /usr/share/npm/node_modules/npm-lifecycle/node-gyp-bin:/root/node/metrics/node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:$
14 verbose lifecycle [email protected]~start: CWD: /root/node/metrics
15 silly lifecycle [email protected]~start: Args: [ '-c', 'node source/app/web/index.mjs' ]
16 silly lifecycle [email protected]~start: Returned: code: 1  signal: null
17 info lifecycle [email protected]~start: Failed to exec start script
18 verbose stack Error: [email protected] start: `node source/app/web/index.mjs`
18 verbose stack Exit status 1
18 verbose stack     at EventEmitter.<anonymous> (/usr/share/npm/node_modules/npm-lifecycle/index.js:283:16)
18 verbose stack     at EventEmitter.emit (events.js:198:13)
18 verbose stack     at ChildProcess.<anonymous> (/usr/share/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
18 verbose stack     at ChildProcess.emit (events.js:198:13)
18 verbose stack     at maybeClose (internal/child_process.js:982:16)
18 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:259:5)
19 verbose pkgid [email protected]
20 verbose cwd /root/node/metrics
21 verbose Linux 4.19.0-13-amd64
22 verbose argv "/usr/bin/node" "/usr/bin/npm" "start"
23 verbose node v10.21.0
24 verbose npm  v5.8.0
25 error code ELIFECYCLE
26 error errno 1
27 error [email protected] start: `node source/app/web/index.mjs`
27 error Exit status 1
28 error Failed at the [email protected] start script.
28 error This is probably not a problem with npm. There is likely additional logging output above.
29 verbose exit [ 1, true ]

[lowlighter]

Hello !

Seems your NodeJS version is a bit outdated (v10) and probably does not support ES modules syntax.

A lot of new JS features are used in metrics (like import/export syntax, ?. and ?? operators, etc.) so you should either upgrade your NodeJS or else use a transpiler like BabelJS to make it run on an older version.

Hope it helped 🙂

[sb2050]

Thank you. I have now installed a newer version of NodeJS and it works.

[lowlighter]

Nice !