express-fileupload-validator

Validator for express-fileupload package.

Installation

npm i express-fileupload

Prerequisites

In order to use this package you need to use express alongside express-fileupload.

const express = require('express');
const expressFileupload = require('express-fileupload');

const app = express();
// ...
app.use(expressFileupload());

app.listen(8080);

Basic Usage

const express = require('express');
const { ExpressFileuploadValidator } = require('express-fileupload-validator');

// You can export it to reuse the same validations.
const expressFileuploadValidator = new ExpressFileuploadValidator({
  minCount: 2,
  maxCount: 8,
  allowedExtensions: ['jpg', 'png', 'gif'],
  allowedMimetypes: ['image/jpg', 'image/jpeg', 'image/png', 'image/gif'],
  maxSize: '20MB',
});

const router = Router();

router.post('/upload-images', (req, res) => {
  if (!req.files || !req.files.images) {
    // We didn't get any files at all here..
  }

  try {
    expressFileuploadValidator.validate(req.files.images); // Validate the file or files.
    // Everything ok we can save the files safely now :)
  } catch (e) {
    console.log(e.errors); // Validation error messages...
  }
});

API

new ExpressFileuploadValidator(options?, errorMessages?)

options

Type: object

In addition, you can specify the below options.

minCount

Type: number
Default: -1 (no limit)

The number of minimum files.

maxCount

Type: number
Default: -1 (no limit)

The number of maximum files.

minSize

Type: string | number
Default: -1 (no limit)

The minimum size per file.
Can be formatted size, for example: 2MB, 5GB and etc.
Can be size in bytes, for example: 6291456 which is 6MB.

maxSize

Type: string | number
Default: -1 (no limit)

The maximum size per file.
Can be formatted size, for example: 2MB, 5GB and etc.
Can be size in bytes, for example: 6291456 which is 6MB.

allowedExtensions

Type: string[]
Default: []

List of allowed file extensions, for example: ['jpg', 'png'].

disallowedExtensions

Type: string[]
Default: []

List of disallowed file extensions, for example: ['jpg', 'png'].

allowedMimetypes

Type: string[]
Default: []

List of allowed file mimetypes, for example: ['image/jpg', 'image/png'].

disallowedMimetypes

Type: string[]
Default: []

List of disallowed file mimetypes, for example: ['image/jpg', 'image/png'].

abortEarly

Type: bool
Default: true

Will decide if to abort as soon as possible, that means you will always gets the first error. If abortEarly is false you will get all collected files errors.

errorMessages

You can specify object with your custom error messages. Please notice you need to keep the placeholders {} to keep the error messages clean.

const expressFileuploadValidator = new ExpressFileuploadValidator({}, {
  minCount: 'Too few files, minimum {0} are expected but {1} are given',
  maxCount: 'Too many files, maximum {0} are allowed but {1} are given',
  minSize: 'Minimum expected size for file {0} is {1} but {2} detected',
  maxSize: 'Maximum allowed size for file {0} is {1} but {2} detected',
  allowedExtensions:
    'File {0} has an incorrect extension of {1}, allowed extensions are: {2}',
  disallowedExtensions:
    'File {0} has an incorrect extension of {1}, disallowed extensions are: {2}',
  allowedMimetypes:
    'File {0} has an incorrect mimetype of {1}, allowed mimetypes are: {2}',
  disallowedMimetypes:
    'File {0} has an incorrect mimetype of {1}, disallowed mimetypes are: {2}',
});