Problem with importing in node.js backend [closed] - redux

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I'm learning a new language (Redux) but I have this problem
Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
Here I added the contents of package.json
...
import express from 'express';
^^^^^^
SyntaxError: Cannot use import statement outside a module
As he asked me I added "type": "module", and I have this problem:
(node:6392) ExperimentalWarning: The ESM module loader is experimental.
internal/modules/run_main.js:54
internalBinding('errors').triggerUncaughtException(
^
Error [ERR_MODULE_NOT_FOUND]: Cannot find module
...\sa\backend\data' imported from
...\sa\backend\server.js
at finalizeResolution (internal/modules/esm/resolve.js:259:11)
at moduleResolve (internal/modules/esm/resolve.js:636:10)
at Loader.defaultResolve [as _resolve]
(internal/modules/esm/resolve.js:726:11)
at Loader.resolve (internal/modules/esm/loader.js:97:40)
at Loader.getModuleJob (internal/modules/esm/loader.js:243:28)
at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:47:40)
at link (internal/modules/esm/module_job.js:46:36) {
code: 'ERR_MODULE_NOT_FOUND'
}
It will be useful to specify that in the frontend React import works normally.
package.json
{
"name": "tryredux",
"version": "1.0.0",
"type": "module",
"description": "\"# tryredux\"",
"main": "index.js",
"dependencies": {
"#babel/cli": "^7.10.5",
"#babel/core": "^7.11.0",
"#babel/node": "^7.10.5",
"#babel/preset-env": "^7.10.4",
"express": "^4.17.1",
"nodemon": "^2.0.4",
"react-router-dom": "^5.2.0"
},
"devDependencies": {
"#babel/cli": "^7.8.4",
"#babel/core": "^7.8.4",
"#babel/node": "^7.8.4",
"#babel/preset-env": "^7.8.4",
"eslint": "^6.8.0",
"eslint-config-airbnb": "^18.1.0",
"eslint-plugin-import": "^2.20.1",
"eslint-plugin-jsx-a11y": "^6.2.3",
"eslint-plugin-react-hooks": "^2.5.1",
"nodemon": "^2.0.2"
},
"scripts": {
"start": "nodemon --watch backend --exec babelnode backend/server.js"
},
"author": "",
"license": "ISC"
}

Answer 1

The answer here explains it quite concise:
https://stackoverflow.com/a/45854500/2361500
In node the default is the commonjs syntax for module handling. You might consider switching to require()

Answer 2

Append .js to the end of data - it should be data.js.