nestjs-file-upload

Upload files and perform validation in nestjs using decorators.

Table of content

• Installation
• Usage
• Arguments
• Example
• License

Installation

Install using

npm i nestjs-file-upload

Usage

1. Add the FileField decorator to the file fields in your dto.

import { Expose } from "class-transformer";
import { FileField, File } from "nestjs-file-upload";

export class MyDto {
    @Expose()
    @FileField()
    myFile: File;

    @Expose()
    anotherField: string;
}

The FileField decorator can be combined with other decorators, such as validation decorators from class-validator.

import { Expose } from "class-transformer";
import { FileField, File } from "nestjs-file-upload";

export class MyDto {
    @Expose()
    @FileField()
    @IsNotEmpty()
    myFile: File;
}

2. Add the FileInjector decorator to the endpoint.

import { Body, Controller, Post, ValidationPipe } from "@nestjs/common";

@Controller("my-controller")
export class MyController {
    @Post()
    @FileInjector(MyDto)
    public uploadFile(@Dto(ValidationPipe) dto: MyDto): void {
        console.log("Received file", dto.myFile.filename);
    }
}

Arguments

An argument of type fileFieldOptions can be passed to the FileField decorator.

You can pass the following properties as options:

Argument	Type	Description
fieldname	string	Overrides the property key. Can be used if the field in the form has a different name.
allowedMimeTypes	string[]	Array of allowed mime types. Mime type validation is based on the reported type in the form. We may use magic numbers in the future.
maxSize	number	Maximum file size in bytes.
maxFile	number	Maximum number of files. If the number is 1, the property will have a value of File. If the value if greater than 1, the property will have a value of File[].

Example

An example is available in the example.

License

See the LICENSE for more info.