docs.sheetjs.com/docz/docs/03-demos/07-data/25-mongodb.md

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MongoDB is a popular document-oriented database engine.

It is straightforward to treat collections as worksheets. Each object maps to a row in the table.

Integration Details

The official NodeJS connector is mongodb.

Importing Data

Data stored in an array of objects can be added to MongoDB Collections using Collection#insertMany. sheet_to_json can generate data from worksheets:

/* import data from a worksheet to a collection */
const aoo = XLSX.utils.sheet_to_json(ws);
await collection.insertMany(aoo, {ordered: true});

Exporting Data

Collection#find can pull an array of objects from a Mongo Collection.

Normally the method adds a _id field to each object. The recommended way to remove the field is to use a projection to suppress the ID:

/* generate an array of objects from a collection */
const aoo = await collection.find({}, {projection:{_id:0}}).toArray();

Worksheets can be generated from the result using json_to_sheet:

/* generate a worksheet from a collection */
const aoo = await collection.find({}, {projection:{_id:0}}).toArray();
const ws = utils.json_to_sheet(aoo);

Complete Example

:::note

This demo was last tested on 2023 February 23 with MongoDB CE 6.0.4, MongoDB connector module 5.1.0 and NodeJS 18.14.2.

:::

0. Install MongoDB 6.0 Community Edition. The macOS steps required brew:

brew tap mongodb/brew
brew update
brew install mongodb-community@6.0

1. Start a MongoDB server on localhost (follow official instructions). To run in the foreground on Intel MacOS:

/usr/local/opt/mongodb-community/bin/mongod --config /usr/local/etc/mongod.conf

2. Create base project and install the dependencies:

{\ mkdir sheetjs-mongo cd sheetjs-mongo npm init -y npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz mongodb@5.1.0}

3. Save the following to SheetJSMongoCRUD.mjs (the key step is highlighted):

import { writeFile, set_fs, utils } from 'xlsx';
import * as fs from 'fs'; set_fs(fs);
import { MongoClient } from 'mongodb';

const url = 'mongodb://localhost:27017/sheetjs';
const db_name = 'sheetjs';

/* Connect to mongodb server */
const client = await MongoClient.connect(url, { useUnifiedTopology: true });

/* Sample data table */
const db = client.db(db_name);
try { await db.collection('pres').drop(); } catch(e) {}
const pres = db.collection('pres');
await pres.insertMany([
  { name: "Barack Obama", idx: 44 },
  { name: "Donald Trump", idx: 45 },
  { name: "Joseph Biden", idx: 46 }
], {ordered: true});

// highlight-start
/* Create worksheet from collection */
const aoo = await pres.find({}, {projection:{_id:0}}).toArray();
const ws = utils.json_to_sheet(aoo);
// highlight-end

/* Export to XLSX */
const wb = utils.book_new();
utils.book_append_sheet(wb, ws, "Presidents");
writeFile(wb, "SheetJSMongoCRUD.xlsx");

/* Close connection */
client.close();

This script:

• connects to the local MongoDB server using database sheetjs
• removes the pres collection if it already exists
• creates a new collection pres with sample data
• creates a SheetJS worksheet from the collection (highlighted in the snippet)
• creates a SheetJS workbook, adds the worksheet, and exports to XLSX

4. Run node SheetJSMongoCRUD.mjs and open SheetJSMongoCRUD.xlsx