Simple Utility for Deno

A handy utility collection.

Example

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BASE64 Binary

const file = await Deno.readFile("/path/to/binary.bin");

const encoded = base64Encode(file); // base64 code.
const decoded = base64Decode(encoded); // Restored.

Date UnixTime

const date = new Date();

const encoded = dateEncode(date); // unixtime in seconds.
const decoded = dateDecode(encoded); // Restored.
const unixtime = dateParse(date.toISOString()); // unixtime in seconds.

DEFLATE Compress

const file = await Deno.readFile("/path/to/binary.bin");

const encoded = await deflateEncode(file); // "deflate" compressed byte array.
const decoded = await deflateDecode(encoded); // Restored.

Extended Fetch API

const json = await fetchExtend("https://path/to/get", "json"); // response as JSON.
const bytes = await fetchExtend("https://path/to/get", "byte"); // response as Uint8Array.

Minipack Archive

const files = [
    ["binary.bin", Deno.readFileSync("/path/to/binary.bin")]
];

const encoded = await minipackEncode(files); // byte array in "minipack" format.
const decoded = await minipackDecode(encoded); // Restored.

Platform Specific

const win = isWin(); // "true" if running on Windows.
const tmp = tmpPath(); // "C:/Windows/Temp" if running on Windows, or "/tmp" if running on Linux or Mac.

Text Convert

const text = " Lorem ipsum  \t  dolor \r sit amet.";

const encoded = ucEncode(text); // byte array in UTF-8 format.
const decoded = ucDecode(encoded); // Restored.
const hexadecimal = hexEncode(encoded); // hexadecimal string.
const formatted = trimExtend(decoded); // formatted string.

Details

It’s basically a thin wrapper around Deno’s functions to improve usability, but some features are original to this module.

This section describes the original features of this module.

Minipack

“Minipack” is a file archive format original to this module.

It’s structure is inspired by the famous “tar” and is minimal as an archive.

Originally developed for web browser, the purpose was to aggregate multiple files input with the HTML File API into a single binary.

Therefore, there is no concept of directory or filesystem, and it’s feature by simple structure that stores only the file body, file name, and hash value for verification.

The actual binary structure looks like this:

Index	Type	Title	Size (Byte)
1	Header	HashValue	32
2	Header	NameSize	1
3	Header	BodySize	4
4	Body	FileName	Max 255 (Defined in NameSize)
5	Body	FileBody	Max 4294967295 (Defined in BodySize)

This is for one file and repeats for the number of files.

Tips

This section is not directly related to this module, but provides a few line snippets to help you implement your application.

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JSON Import

const {default: config} = await import("./config.json", {assert: {type: "json"}});

API

See Deno Document for details.