Read excel file uploaded to s3 via node lambda function - node.js

Question

I am trying to parse through an excel file that is uploaded to s3 using read-excel-file in a node lambda function that triggers on any s3 put. Here is my code which currently doesn't work. Can somebody tell me where I am going wrong?
const aws = require("aws-sdk");
const s3 = new aws.S3({ apiVersion: "2006-03-01" });
const readXlsxFile = require("read-excel-file/node");
exports.handler = async (event, context) => {
// Get the object from the event and show its content type
const bucket = event.Records[0].s3.bucket.name;
const key = decodeURIComponent(
event.Records[0].s3.object.key.replace(/\+/g, " ")
);
const params = {
Bucket: bucket,
Key: key
};
try {
const doc = await s3.getObject(params);
const parsedDoc = await readXlsxFile(doc);
console.log(parsedDoc)
} catch (err) {
console.log(err);
const message = `Error getting object ${key} from bucket ${bucket}. Make sure they exist and your bucket is in the same region as this function.`;
console.log(message);
throw new Error(message);
}
};

Answer 1

I haven't used lambda functions, but I have done something very similar in firebase functions. I used convert-excel-to-json.
I first downloaded the excel file from firebase storage to the firebase functions machine. Then use this npm module to extract the information.
I don't have time to format the code, but I can leave it here for reference:
// Runs when excel file is uploaded to storage
exports.uploadOrder = functions.storage.object().onFinalize(async (file) => {
const fileBucket = file.bucket;
const filePath = file.name || "null";
const filePathList = filePath?.split("/") || ["null"];
const fileName = path.basename(filePath);
if (filePathList[0] !== "excel_orders") {
return;
}
const uid = filePathList[1];
console.log("User ID: " + uid);
const bucket = admin.storage().bucket(fileBucket);
const tempFilePath = path.join(os.tmpdir(), fileName);
console.log(tempFilePath);
await bucket.file(filePath).download({ destination: tempFilePath });
const result = excelToJson({
sourceFile: tempFilePath,
});
var ordersObj: any[] = result.Sheet1;
ordersObj.shift();
console.log(ordersObj);
var orders: any[] = [];
for (let i = 0; i < ordersObj.length; i++) {
const order: Order = {
package_description: ordersObj[i].A,
package_type: ordersObj[i].B,
country: ordersObj[i].C,
address: ordersObj[i].D,
curstomer_name: ordersObj[i].E,
customer_phone: ordersObj[i].F,
collection_ammount: ordersObj[i].G,
order_date: ordersObj[i].H,
delivery_date: ordersObj[i].I,
delivery_time: ordersObj[i].J,
status: "pending",
assignedTo: "",
merchantID: uid,
};
orders.push(order);
}
});