Download jsonarray file express, node, angular

In a webapp I’m doing, there are jsonarray files that are created. For example, they look like:

[{attr1:"123",attr2:"456"},{attr1:"abc",attr2:"def"}]

I am trying to send these jsonarray files to the client and they should be downloaded exactly as they in the server, they should not be opened or parsed.

In express I have tried using, send, sendFile and download

res.setHeader('Content-Type', 'application/json');
res.setHeader('Content-Disposition', 'attachment; filename=file.json');

res.sendFile(name, function (err) {
    if (err) {
         console.log('error sending:', name, err);
    } else {
         console.log('Sent:', name);
    }
});

in the front end I am using file-saver

this.Service.get(filename).subscribe(
    result => {
        console.log(result)
        let blob = new Blob(result, {type: "application/json"});
        saveAs(blob, collectionname+".json");
    }
);

and when i open the file in the client it looks like this:

[object Object][object Object]

But then I console.log() the result, I see the json objects.

What can I do?

Versions of my setup:
Angular CLI: 12.0.5
Node: 14.16.1
Package Manager: npm 7.11.1
Angular: 12.0.5

>Solution :

Blob cannot take json objects as argument (not even array of json objects).
You could pass an array of strings, e.g.

new Blob(result.map(x=>JSON.stringify(x)), {type: "application/text"});

Raed the Blob documentation for details.