@coolgk/formdata

a javascript / typescript module

npm install @coolgk/formdata

A http request form data parser (large file friendly) for 'application/json', 'application/x-www-form-urlencoded' and 'multipart/form-data'. It only parses form data when you ask for it.

Report bugs here: https://github.com/coolgk/node-utils/issues

Example Form

<form method="POST" enctype="multipart/form-data">
    <input type="text" name="name">
    <input type="text" name="age">
    <input type="file" name="photo">
    <input type="file" name="photo">
    <input type="file" name="id">
</form>

Express Middleware

// express middleware
const app = require('express')();
const formdata = require('@coolgk/formdata');

app.use(formdata.express());

app.post('/id-only', async (request, response, next) => {
    const post = await request.formdata.getData('id'); // upload 3 files but only parse 1, ignore others
    console.log(post);
    response.json(post);
    // output
    // {
        // "name": "Tim",
        // "age": "33",
        // "id": {
            // "error": null,
            // "fieldname": "id",
            // "filename": "test.txt",
            // "encoding": "7bit",
            // "mimetype": "text/plain",
            // "size": 13,
            // "path": "/tmp/151605931497716067xZGgxPUdNvoj"
        // }
    // }
});

app.post('/all-files', async (request, response, next) => {
    const post = await request.formdata.getData(['id', 'photo']); // parse all files
    console.log(post);
    response.json(post);
    // output
    // {
        // "name": "Tim",
        // "age": "33",
        // "photo": [
            // {
                // "error": null,
                // "fieldname": "photo",
                // "filename": "test.png",
                // "encoding": "7bit",
                // "mimetype": "image/png",
                // "size": 604,
                // "path": "/tmp/151605931497716067xZGgxPUdNvoj"
            // },
            // {
                // "error": null,
                // "fieldname": "photo",
                // "filename": "test.svg",
                // "encoding": "7bit",
                // "mimetype": "image/svg+xml",
                // "size": 2484,
                // "path": "/tmp/151605931497916067EAUAa3yB4q42"
            // }
        // ],
        // "id": {
            // "error": null,
            // "fieldname": "id",
            // "filename": "test.txt",
            // "encoding": "7bit",
            // "mimetype": "text/plain",
            // "size": 13,
            // "path": "/tmp/151605931498016067zqZe6dlhidQ5"
        // }
    // }
});

app.listen(8888);

Native Node App

const { formData, express, getFormData, FormDataError } = require('@coolgk/formdata');
const http = require('http');
http.createServer(async (request, response) => {

    const data = await getFormData(request, { fileFieldNames: ['id', 'photo'] });

    // OR
    // const formdata = formData(request);
    // ... some middelware
    // ... in some routes
    // const data = formdata.getData(['id', 'photo']);

    console.log(data);
    response.end(JSON.stringify(data));

    // {
        // "name": "Tim",
        // "age": "33",
        // "photo": [
            // {
                // "error": null,
                // "fieldname": "photo",
                // "filename": "test.png",
                // "encoding": "7bit",
                // "mimetype": "image/png",
                // "size": 604,
                // "path": "/tmp/151605931497716067xZGgxPUdNvoj"
            // },
            // {
                // "error": null,
                // "fieldname": "photo",
                // "filename": "test.svg",
                // "encoding": "7bit",
                // "mimetype": "image/svg+xml",
                // "size": 2484,
                // "path": "/tmp/151605931497916067EAUAa3yB4q42"
            // }
        // ],
        // "id": {
            // "error": null,
            // "fieldname": "id",
            // "filename": "test.txt",
            // "encoding": "7bit",
            // "mimetype": "text/plain",
            // "size": 13,
            // "path": "/tmp/151605931498016067zqZe6dlhidQ5"
        // }
    // }

}).listen(8888);