Object Form Encoder

This package provides a simple way to convert any object to a FormData instance to send it to remote server.

Features

• Convert any object to FormData instance
• Converts complex objects to JSON strings
• Normalizes Dates to ISO strings
• Assigns arrays with key[] syntax

Installation

1. Add object-form-encoder dependency to your project

# Using pnpm
pnpm add -D object-form-encoder

# Using yarn
yarn add --dev object-form-encoder

# Using npm
npm install --save-dev object-form-encoder

That's it! You can now use this package in your app ✨

Usage

Let's imagine that you have this object in your application code:

const payload = {
    name: 'John',
    roles: ['user', 'admin'],
    is_active: true,
    has_children: false,
    age: 30,
    address: {
        street: 'Street name',
        city: 'City name',
    },
    created_at: new Date('2020-01-01'),
    avatar: new File(['foo'], 'foo.txt'), // e.g. from <input type="file" />
    uploads: new FileList([...]), // e.g. from <input type="file" multiple />
};

And you need to send it to the server as multipart/form-data request. You can do it with this package:

import { objectToFormData } from 'object-form-encoder';

const formData = objectToFormData(payload);

Now you are free to send this formData to the remote API.

Normalization

Since some types should be normalized before appending to the FormData instance, this package contains a list of normalizers for such types:

• FileList - appends each file to the same key with key[] syntax
• Array - appends each item to the same key with key[] syntax
• File - appends as is
• Date - normalizes to ISO string
• Boolean - converts to 1 or 0 string
• Object - converts to JSON string
• Scalar - appends as is (any type that is not object)

Each normalizer applies only once and the order of normalizers is the same as in the list above.

Development

# Install dependencies
yarn install

# Build package
yarn build

# Run Prettier
yarn fmt

# Run ESLint
yarn lint

# Run Vitest
yarn test

# Release new version
yarn release