how to upload files to a node js server

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Cameron
05 Feb 2019
1/*
2    This code comes from Vincent Lab
3    And it has a video version linked here: https://www.youtube.com/watch?v=KP_8gN8kh4Y
4*/
5
6// Import dependencies
7const fs = require("fs");
8const YAML = require("js-yaml");
9const express = require("express");
10const multer = require("multer");
11
12// Setup express
13const app = express();
14const port = 3000;
15
16// Setup Storage
17const storage = multer.diskStorage({
18    destination: function (req, file, cb) {
19        // Set the destination where the files should be stored on disk
20        cb(null, "uploads");
21    },
22    filename: function (req, file, cb) {
23        // Set the file name on the file in the uploads folder
24        cb(null, file.fieldname + "-" + Date.now());
25    },
26    fileFilter: function (req, file, cb) {
27
28        if (file.mimetype !== "text/yaml" || file.mimetype !== "text/x-yaml" || file.mimetype !== "application/x-yaml") {
29            // To reject a file pass `false` or pass an error
30            cb(new Error(`Forbidden file type`));
31        } else {
32            // To accept the file pass `true`
33            cb(null, true);
34        }
35
36    }
37});
38
39// Setup multer
40const upload = multer({ storage: storage }); // { destination: "uploads/"}
41
42// Setup the upload route
43app.post("/upload", upload.single("data"), (req, res) => {
44
45    if (req.file) {
46
47        // Get YAML or throw exception on error
48        try {
49
50            // Load the YAML
51            const raw = fs.readFileSync(`uploads/${req.file.filename}`);
52            const data = YAML.safeLoad(raw);
53
54            // Show the YAML
55            console.log(data);
56
57            // Delete the file after we're done using it
58            fs.unlinkSync(`uploads/${req.file.filename}`);
59
60        } catch (ex) {
61
62            // Show error
63            console.log(ex);
64
65            // Send response
66            res.status(500).send({
67                ok: false,
68                error: "Something went wrong on the server"
69            });
70            
71        }
72
73        // Send response
74        res.status(200).send({
75            ok: true,
76            error: "File uploaded"
77        });
78
79    } else {
80
81        // Send response
82        res.status(400).send({
83            ok: false,
84            error: "Please upload a file"
85        });
86
87    }
88
89})
90
91// Start the server
92app.listen(port, () => console.log(`YAML file uploader listening at http://localhost:${port}`));
source
Theo
21 Jun 2016
1<!--
2    This code comes from Vincent Lab
3    And it has a video version linked here: https://www.youtube.com/watch?v=KP_8gN8kh4Y
4-->
5
6<!DOCTYPE html>
7<html>
8  <head>
9    <title>YAML File Uploader</title>
10  </head>
11  <body>
12    <!-- https://code.tutsplus.com/tutorials/file-upload-with-multer-in-node--cms-32088 -->
13    <form action="http://localhost:3000/upload" enctype="multipart/form-data" method="POST">
14      <input type="file" name="data" />
15      <input type="submit" value="Upload a file" />
16    </form>
17  </body>
18</html>
source
Sara
09 Oct 2019
1    npm install --save multer
source
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