How to use FormData in Node.js without browser?

To use FormData in Node.js without browser, we use the URLSearchParams constructor.

For instance, we write

const fs = require("fs");

const form = new URLSearchParams();
form.append("my_field", "my value");
form.append("my_buffer", new Buffer(10));
form.append("my_file", fs.createReadStream("/foo/bar.jpg"));

to create a URLSearchParams object.

Then we call append with the key and value of each form data entry to add it.

We can add buffers and read streams for binary data.