Example of importing data with cloud functions. See a live example at https://www.back4app.com/database/davimacedo/parse-import-example

curl.sh

curl -X POST \
-H "X-Parse-Application-Id: LL9oIdzIkmwl5xyowQQu0fTmXyUWfet9RuAzwHfj" \
-H "X-Parse-REST-API-Key: R3S8PYQKuzeV4c8MUeO5ved46C50MEp56boDHW1O" \
-H "Content-Type: application/json" \
-d @data.json \
https://parseapi.back4app.com/functions/import

data.json

{
	"className": "ExampleClass",
	"rows": [
		{ "ExampleColumnA": "row1columnA", "ExampleColumnB": "row1columnB" },
		{ "ExampleColumnA": "row2columnA", "ExampleColumnB": "row2columnB"}
	]
}

main.js

Parse.Cloud.define('import', async request => {
  const className = request.params.className;
  const rows = request.params.rows;

  const MyClass = Parse.Object.extend(className);

  var myClassObjects = [];
  for (let i = 0; i < rows.length; i++) {
    const myClassObject = new MyClass();

    for (const column in rows[i]) {
      myClassObject.set(column, rows[i][column]);
    }

    myClassObjects.push(myClassObject);
  }

  try {
    await Parse.Object.saveAll(myClassObjects);
  } catch (e) {
    throw new Error(`Import failed: ${e}`);
  }
  
  return `Successfully imported ${myClassObjects.length} rows into ${className} class`;
});

Is there a better way of importing data to parse server?
Imagine thousand of rows to import, I'm worried about those for loops there.

@Milad-abbasi I've just updated the example to be compliant with the latest version of Parse and also to use Parse.Object.saveAll(). It conveniently splits the requests in batches so you can make sure it works properly. I also added the link for a living example at the Back4App Database Hub so you can just run and see the imported rows or clone, check the cloud code out and play around.

Little heads up for anyone looking. I feel like there could be a small versioning issue between the function here and the one posted in the live example. The version on this page revised on Jan 5 2020 and current as of June 23 2021 works great for me and also employs the improvements the owner describes in his Jan 5 2020 comment. Whereas the example posted in the live example fails for me at the line Parse.Promise.when(promises).

Thanks for the heads up. I've just updated the live example code.