file_size_url

file_size_url is a simple Node.js library for fetching the size of a file from a given URL using either HTTP or HTTPS protocols. It returns the file size in a human-readable format such as "1.23 MB".

0 dependencies.

Installation

You can install the library via npm:

npm install file_size_url

Alternatively, if you have the source code, you can directly use the function in your Node.js project:

# Simply copy the source code file to your project directory

Usage

Importing and Using the Library

import fileSizeUrl from 'file_size_url';

fileSizeUrl("https://example.com/file.zip")
  .then(size => console.log(`File size: ${size}`))
  .catch(error => console.error(`Error: ${error.message}`));

Example with telegraf (Telegram Bot)

You can integrate file_size_url with telegraf to fetch and display file sizes in your Telegram bot:

import { Telegraf } from 'telegraf';
import fileSizeUrl from 'file_size_url';

const bot = new Telegraf('<YOUR_BOT_TOKEN>');

bot.command('filesize', async (ctx) => {
  const url = ctx.message.text.split(' ')[1];
  if (!url) return ctx.reply('Please provide a URL.');

  try {
    const size = await fileSizeUrl(url);
    ctx.reply(`File size: ${size}`);
  } catch (error) {
    ctx.reply(`Error: ${error.message}`);
  }
});

bot.launch();

Example with express.js

You can use file_size_url in an express.js server to get file sizes via an API:

import express from 'express';
import fileSizeUrl from 'file_size_url';

const app = express();

app.get('/filesize', (req, res) => {
  const { url } = req.query;
  if (!url) return res.status(400).send('URL parameter is required');

  fileSizeUrl(url)
    .then(size => res.send(`File size: ${size}`))
    .catch(error => res.status(500).send(`Error: ${error.message}`));
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Using file_size_url in a Loop

You can easily use file_size_url inside a loop to fetch file sizes from multiple URLs:

import fileSizeUrl from './file_size_url.js';

const urls = [
  'https://example.com/file1.zip',
  'https://example.com/file2.zip',
  'https://example.com/file3.zip'
];

urls.forEach(async (url) => {
  try {
    const size = await fileSizeUrl(url);
    console.log(`File size for ${url}: ${size}`);
  } catch (error) {
    console.error(`Error fetching size for ${url}: ${error.message}`);
  }
});

Using file_size_url with Promise.all

Fetch file sizes concurrently for multiple URLs using Promise.all:

import fileSizeUrl from './file_size_url.js';

const urls = [
  'https://example.com/file1.zip',
  'https://example.com/file2.zip',
  'https://example.com/file3.zip'
];

Promise.all(urls.map(url => fileSizeUrl(url)))
  .then(sizes => {
    sizes.forEach((size, index) => {
      console.log(`File size for ${urls[index]}: ${size}`);
    });
  })
  .catch(error => console.error(`Error: ${error.message}`));

API Reference

fileSizeUrl(url)

Fetches the file size from a given URL.

Parameters

• url (string): The URL of the file.

Returns

• Promise: Resolves with the file size as a formatted string (e.g., "1.23 MB"). If an error occurs, the promise is rejected with an error message.

Example

fileSizeUrl("https://example.com/file.zip")
  .then(size => console.log(`File size: ${size}`))
  .catch(error => console.error(`Error: ${error.message}`));

Error Handling

• Invalid URL: If the URL is invalid or missing.
• The address should be http or https: If the protocol is not supported.
• Failed to get file size, status code: <statusCode>: If the HTTP status code is not 200.
• Couldn't retrieve file size from headers: If the content-length header is missing or invalid.

formatBytes(bytes)

Formats bytes into a human-readable string.

Parameters

• bytes (number): The number of bytes.

Returns

• string: The formatted size string (e.g., "1.23 MB").

Example

console.log(formatBytes(12345678)); // Output: "11.77 MB"

Notes

• Make sure the URL starts with http:// or https://.
• The library is designed to work only in Node.js environments that support the native http and https modules.

License

This library is available under the MIT License.

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