First of all, download and install multer.
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npm install --save multer |
Include the dependency.
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var multer = require("multer"); |
Initialise it into a service. The command below will initialise it with default storage type (being DiskStorage) and upload destination being the uploads/ folder.
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var uploadService = multer({ dest: "uploads/" }); |
If you don’t want the file to be saved anywhere in the file system and want to use memory storage, initialise it as follows.
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var uploadService = multer({ storage: multer.memoryStorage() }); |
You can add file size limits too. The command below sets the file upload limit to be 12 megabytes.
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var uploadService = multer({storage: multer.memoryStorage(), limits: {fileSize: 1000 * 1000 * 12}}); |
You can then pass around the uploadService object to other modules that use it.
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function FileUploadRoute(express, uploadService) { |
To read uploads in a route, add it to the second parameter of the route definition. The following commands processes a single file uploaded under file attribute within post form-data.
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router.post("/", uploadService.single('file'), function (req, res) { var uploadedFile = req.file; }); |
The uploadedFile object here contains data about the file that was uploaded. The buffer attribute of this object contains the actual file content. The object also has other attributes like filename, mimeType and encoding that can be used to process the file according its type.
For more information, see multer on npm.