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# tr46
An JavaScript implementation of [Unicode Technical Standard #46: Unicode IDNA Compatibility Processing](https://unicode.org/reports/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)
* [`ignoreInvalidPunycode`](#ignoreinvalidpunycode)
* [`transitionalProcessing`](#transitionalprocessing)
* [`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)
* [`ignoreInvalidPunycode`](#ignoreinvalidpunycode)
* [`transitionalProcessing`](#transitionalprocessing)
* [`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.
### `ignoreInvalidPunycode`
Type: `boolean`
Default value: `false`
When set to `true`, invalid Punycode strings within the input will be allowed.
### `transitionalProcessing`
Type: `boolean`
Default value: `false`
When set to `true`, uses [transitional (compatibility) processing](https://unicode.org/reports/tr46/#Compatibility_Processing) of the deviation characters.
### `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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