I want to upload and save single or multiple images with Angular, Node.js and Mongoose (GridFS). The other way to save the image is Base64 but I want to work with GridFs.
Using Angular 7.
In the backend, I just see req.file
is undefined and req.body
is {} empty. I append my file data into formData
and pass it into HTTP request over Angular. On console.log(this.files)
I can see the data in the Browser console. I've tested with Postman as well.
HTML
<mat-step [stepControl]="photoForm">
<form [formGroup]="photoForm">
<ng-template matStepLabel>Photos</ng-template>
<div class="container">
<div class="imagePreview" *ngFor="let x of imageSrc" (click)="deleteImage($event)">
<img class="img" [src]="x" />
</div>
</div>
<input type="file" multiple (change)="onFileChange($event)" #fileInput style="display: none" />
<button (click)="fileInput.click()">Select File</button>
</form>
</mat-step>
Angular
onFileChange(event) {
if (event.target.files && event.target.files.length) {
this.files = event.target.files;
}
onSubmit() {
const uploadData = new FormData();
uploadData.append('myFile', this.files, this.files.name);
this.http.post(url + '/api/upload', uploadData).subscribe((item) => {
console.log(item);
});
}
}
Node.js
import * as compression from "compression";
import * as express from "express";
import * as bodyParser from "body-parser";
import * as mongoose from "mongoose";
import { Routes } from "./routes/routes";
import * as cors from 'cors';
import { urlencoded } from "body-parser";
import { Contact } from "./routes/contact";
import { AddTour } from "./routes/addTour";
const path = require('path');
const mongoURI = 'mongodb://127.0.0.1/testDB';
let gfs;
//GridFS
const crypto = require('crypto');
const mongoose = require('mongoose');
const multer = require('multer');
const GridFsStorage = require('multer-gridfs-storage');
const Grid = require('gridfs-stream');
const methodOverride = require('method-override');
class App {
public app: express.Application;
public addTourObj: AddImages = new AddImages();
constructor() {
this.app = express();
this.config();
this.addTourObj.addImage(this.app);
this.connectMongoDB();
/** Setting up storage using multer-gridfs-storage */
// Create storage engine
const storage = new GridFsStorage({
url: mongoURI,
file: (req, file) => {
return new Promise((resolve, reject) => {
crypto.randomBytes(16, (err, buf) => {
if (err) {
return reject(err);
}
const filename = buf.toString('hex') + path.extname(file.originalname);
const fileInfo = {
filename: filename,
bucketName: 'uploads'
};
resolve(fileInfo);
});
});
}
});
var upload = multer({ //multer settings for single upload
storage: storage
}).single('file');
}
private config() {
this.app.use(cors());
this.app.options('*', cors());
this.app.use(bodyParser.json());
this.app.use(urlencoded({ extended: true }));
this.app.use(compression());
}
private connectMongoDB() {
const conn = mongoose.createConnection(mongoURI);
conn.once('open', () => {
// Init stream
gfs = Grid(conn.db, mongoose.mongo);
gfs.collection('uploads');
});
}
}
export default new App().app;
Node.js AddImage.ts
import { Request, Response } from "express";
import { request } from "http";
export class AddImage {
public addImage(app): void {
app.route('/api/upload').post((req, res) => {
console.log(req.file) // is undefined
console.log(req.body) // is empty {}
});
}
}
The result should be uploaded the image into MongoDB with Gridfs which I need to retrieve or delete again.
I can see the formData as file: binary in the browser.
replace this
uploadData.append('myFile', this.files, this.files.name);
with
uploadData.append('file', this.files, this.files.name);
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