query-pack

---

Encode - Decode Query Parameter

- Usage
- Options
- Philosophy
- Base
- Primitive Strategies
- Complex Strategies

Usage

Installation:

``js
npm install query-pack
`

$3

Encodes string value:

`ts
import { encode } from 'query-pack';
...
const qParam = encode('Hey, how are you?')
const url = https://mydomain.com?q=${qParam};
console.log(url);
// => https://mydomain.com?q=UheyCWhowWareWyouQ
`

Decodes string value:

`ts
import { decode } from 'query-pack';
...
let params = (new URL(document.location)).searchParams;
let qParam = params.get("q");
const value = decode(qParam);
console.log(value);
// => Hey, how are you?
`

$3

Encodes object value:

`ts
import { encode } from 'query-pack';
...
const qParam = encode({
id: 1,
name: "Team 1",
captain: "zak",
})
const url = https://mydomain.com?q=${qParam};
console.log(url);
// => https://mydomain.com?q=1XidN1YnameSUteamW1YcaptainSzak
`

Decodes object value:

`ts
import { decode } from 'query-pack';
...
let params = (new URL(document.location)).searchParams;
let qParam = params.get("q");
const value = decode(qParam);
console.log(value);
// => {
// id: 1,
// name: "Team 1",
// captain: "zak",
// }
`

Options

Options is an encoding settings passed as a second parameter to the encode or decode functions. Has PackOptions type.

| Name | Description |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| fields | Replaces the names of the object's fields into numbers in order to make encoded result shorter. Example of using fields optimization |
| values | Replaces the values of the object's field into numbers or short strings in order to make encoded result shorter. Example of using values optimization |
| includeUndefinedProperty | Indicates if property of object with undefined value must be included into encoded result. Default value is false |

$3

Here we have a team object. Its field's names are replaced with numbers (id=> 1, ...). Since numbers are shorter and as result we will have shorter encoded result.

`ts
import { encode, decode, PackOptions } from 'query-pack';
...
const packOptions: PackOptions = {
fields:{
id: 1,
name: 2,
captain: 3
}
}
...
const qParam = encode({
id: 1,
name: "Team 1",
captain: "zak",
}, packOptions);

console.log(qParam);
// => 1X1N1Y2SUteamW1Y3Szak

const team = decode(qParam, packOptions);
console.log(team);
// => {
// id: 1,
// name: "Team 1",
// captain: "zak",
// }

`

$3

Here we have a player object with level field. Possible values for it are strings: unknown, notbad, normal, good, star. We replacing them with numbers. In our case the player object has good level value. So while encoding it would receive value of 4. This makes encoded result shorter.

`ts
import { encode, decode, PackOptions } from 'query-pack';
...
const packOptions: PackOptions = {
values:{
level: {
unknown: 1,
notbad: 2,
normal: 3,
good: 4,
star: 5,
},
}
}
...
const qParam = encode({
name: "zak",
level: "good",
}, packOptions);

console.log(qParam);
// => 1XnameSzakYlevelS4

const team = decode(qParam, packOptions);
console.log(team);
// => {
// name: "zak",
// level: "good",
// }

`

Philosophy

The maximum length of URL is 2048 characters. This is enough space for encoding data for small or medium page.
What's more, in this case you don't need to have database or API.

There is and example of using query-pack. This is the tournament team constructor witch generates the tournament data into URL's query parameter. That's it, no API or database the tournament data is stored into the URL. This link has 512 chars and this is enough for encoding information about 4 teams and 24 players, games between teams, scheduel and results.

Base

query-pack encodesstring, number, boolean, array, object values into a string for using it in URL's query paramter.

This is kind of alternative of using encodeURIComponent and decodeURIComponent, but with differences. The primitive types like string, number, and boolean query-pack makes shorter in coparances to encodeURIComponent function with the Primitive Strategies. Also, the query-pack can encode complex types like object or array with the Complex Strategies where the encodeURIComponent does not support compolex types.

Primitive Strategies

$3

In URL encoding there are not replacing chars: numbers, upper and lower case English letters, -, _, ., ~. All other has encodes with extra chars, for instance @ encodes as %40. zqip replace upper case chars on the text with U + upper case char or U{X} + X upper case chars.

| Text | Encoded |
| ----- | -------- |
| Hello | Uhello |
| HTML | U5html |

This helps to release all other upper case English letters for further encoding strategies.

$3

Most used chars are replaced with upper case chars.

| Char | URL Encoding | query-pack |
| ------- | ------------ | ---- |
| space | %20 | W |
| ' | %27 | H |
| ( | %28 | G |
| ) | %29 | R |
| ; | %3B | T |
| : | %3A | K |
| @ | %40 | M |
| = | %3D | J |
| + | %2B | P |
| , | %2C | C |
| ? | %3F | Q |
| " | %22 | H |

| | String | URL Encoding | query-pack |
| ------ | ----------------- | --------------------------- | ------------------ |
| Text | Hey, how are you? | Hey%2C%20how%20are%20you%3F | UheyCWhowWareWyouQ |
| Length | 17 | 27 | 18 |

$3

Decimal numbers replaces with based32 numbers.

| | Number | query-pack |
| ------ | ---------- | ------- |
| Value | 123456.789 | 3oi0.ol |
| Length | 10 | 7 |

$3

Replaces with 0 and 1.

| Boolean | query-pack |
| ------- | ---- |
| false | 0 |
| true | 1 |

Complex Strategies

Complex strategy provides the way of converting into a string the object with properties or array of items. To list values need to split them somehow and indicate their type. The below table contains type indicators:

| Type | query-pack type indicator |
| ----------- | --------------------- |
| string | S |
| number | N |
| boolean | B |
| object | O |
| array | A |
| null | L |
| undefined | F |

Next table contains splitters:

| query-pack splitter | Description |
| --------------- | ----------- |
| Y | Property |
| X | Object |

$3

| Type | Array | zqip |
| ----------------------- | ----------------------- | -------------- |
| Number | [12, 34, 56] | NcN12N1o |
| String | ["cat", "dog", "mouse"] | ScatSdogSmouse |
| Number, String, Boolean | [12, "dog", true] | NcSdogB1 |

$3

Let's imaging we have the team object:

`js
{
id: 1,
name: "Team 1",
captain: "zak",
}
`

After encoding into a string:

`text
idN1YnameSUteamW1YcaptainSzak
``