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Quick start

To upload files to MEGA import the library using either ES modules or CommonJS.

Then create a storage object to login using your e-mail and password, then wait for the "ready" event.

Finally you can call the .upload() method to upload files to your account.

Node ESM
Node CJS
Browser
Deno

import { Storage } from 'megajs'

const storage = await new Storage({
  email: 'user@example.com',
  password: 'correct horse battery example'
}).ready

const file = await storage.upload('hello-world.txt', 'Hello world!').complete
console.log('The file was uploaded!', file)

const { Storage } = require('megajs')

// Node doesn't support top-level await when using CJS
;(async function () {
  const storage = await new Storage({
    email: 'user@example.com',
    password: 'correct horse battery example'
  }).ready

  const file = await storage.upload('hello-world.txt', 'Hello world!').complete
  console.log('The file was uploaded!', file)
}()).catch(error => {
  console.error(error)
  process.exit(1)
})

import { Storage } from 'https://unpkg.com/megajs/dist/main.browser-es.mjs'

const storage = await new Storage({
  email: 'user@example.com',
  password: 'correct horse battery example'
}).ready

const file = await storage.upload('hello-world.txt', 'Hello world!').complete
console.log('The file was uploaded!', file)

import { Storage } from 'npm:megajs'

const storage = await new Storage({
  email: 'user@example.com',
  password: 'correct horse battery example'
}).ready

const file = await storage.upload('hello-world.txt', 'Hello world!').complete
console.log('The file was uploaded!', file)

Downloading files

To download shared files then you first open a file object using the File.fromURL() method.

Then you load file attributes such as name and size using .loadAttributes().

Finally use the .downloadBuffer() method to download the file which will return a Buffer with the file contents.

Node ESM
Node CJS
Browser
Deno

import { File } from 'megajs'

const file = File.fromURL('https://mega.nz/file/example#example')

await file.loadAttributes()
console.log(file.name) // file name
console.log(file.size) // file size in bytes

const data = await file.downloadBuffer()
console.log(data.toString()) // file contents

const { File } = require('megajs')

// Node doesn't support top-level await when using CJS
;(async function () {
  const file = File.fromURL('https://mega.nz/file/example#example')

  await file.loadAttributes()
  console.log(file.name) // file name
  console.log(file.size) // file size in bytes

  const data = await file.downloadBuffer()
  console.log(data.toString()) // file contents
}()).catch(error => {
  console.error(error)
  process.exit(1)
})

import { File } from 'https://unpkg.com/megajs/dist/main.browser-es.mjs'

const file = File.fromURL('https://mega.nz/file/example#example')
file.api.userAgent = null

await file.loadAttributes()
console.log(file.name) // file name
console.log(file.size) // file size in bytes

const data = await file.downloadBuffer()
console.log(data.toString()) // file contents

import { File } from 'npm:megajs'

const file = File.fromURL('https://mega.nz/file/example#example')

await file.loadAttributes()
console.log(file.name) // file name
console.log(file.size) // file size in bytes

const data = await file.downloadBuffer()
console.log(data.toString()) // file contents

Check the tutorial for more info

This is based on tonistiigi's mega library.
This is all unofficial, based on developer guide and site source.
Make sure you agree with MEGA's Terms of Service before using it.