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# tr46
An JavaScript implementation of [Unicode Technical Standard #46: Unicode IDNA Compatibility Processing](https://unicode.org/reports/tr46/).
## Installation
[Node.js](http://nodejs.org) ≥ 8 is required. To install, type this at the command line:
```shell
npm install tr46
# or
yarn add tr46
```
## API
### `toASCII(domainName[, options])`
Converts a string of Unicode symbols to a case-folded Punycode string of ASCII symbols.
Available options:
* [`checkBidi`](#checkBidi)
* [`checkHyphens`](#checkHyphens)
* [`checkJoiners`](#checkJoiners)
* [`processingOption`](#processingOption)
* [`useSTD3ASCIIRules`](#useSTD3ASCIIRules)
* [`verifyDNSLength`](#verifyDNSLength)
### `toUnicode(domainName[, options])`
Converts a case-folded Punycode string of ASCII symbols to a string of Unicode symbols.
Available options:
* [`checkBidi`](#checkBidi)
* [`checkHyphens`](#checkHyphens)
* [`checkJoiners`](#checkJoiners)
* [`processingOption`](#processingOption)
* [`useSTD3ASCIIRules`](#useSTD3ASCIIRules)
## Options
### `checkBidi`
Type: `Boolean`
Default value: `false`
When set to `true`, any bi-directional text within the input will be checked for validation.
### `checkHyphens`
Type: `Boolean`
Default value: `false`
When set to `true`, the positions of any hyphen characters within the input will be checked for validation.
### `checkJoiners`
Type: `Boolean`
Default value: `false`
When set to `true`, any word joiner characters within the input will be checked for validation.
### `processingOption`
Type: `String`
Default value: `"nontransitional"`
When set to `"transitional"`, symbols within the input will be validated according to the older IDNA2003 protocol. When set to `"nontransitional"`, the current IDNA2008 protocol will be used.
### `useSTD3ASCIIRules`
Type: `Boolean`
Default value: `false`
When set to `true`, input will be validated according to [STD3 Rules](http://unicode.org/reports/tr46/#STD3_Rules).
### `verifyDNSLength`
Type: `Boolean`
Default value: `false`
When set to `true`, the length of each DNS label within the input will be checked for validation.
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