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1# dns-txt
2
3Encode or decode the RDATA field in multicast DNS TXT records. For use
4with DNS-Based Service Discovery. For details see [RFC
56763](https://tools.ietf.org/html/rfc6763).
6
7[![Build status](https://travis-ci.org/watson/dns-txt.svg?branch=master)](https://travis-ci.org/watson/dns-txt)
8[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://github.com/feross/standard)
9[![abstract-encoding](https://img.shields.io/badge/abstract--encoding-compliant-brightgreen.svg?style=flat)](https://github.com/mafintosh/abstract-encoding)
10
11## Installation
12
13```
14npm install dns-txt
15```
16
17## Usage
18
19```js
20var txt = require('dns-txt')()
21
22var obj = {
23 foo: 1,
24 bar: 2
25}
26
27var enc = txt.encode(obj) // <Buffer 05 66 6f 6f 3d 31 05 62 61 72 3d 32>
28
29txt.decode(enc) // { foo: '1', bar: '2' }
30```
31
32## API
33
34The encoder and decoder conforms to [RFC 6763](https://tools.ietf.org/html/rfc6763).
35
36### Initialize
37
38The module exposes a constructor function which can be called with an
39optional options object:
40
41```js
42var txt = require('dns-txt')({ binary: true })
43```
44
45The options are:
46
47- `binary` - If set to `true` all values will be returned as `Buffer`
48 objects. The default behavior is to turn all values into strings. But
49 according to the RFC the values can be any binary data. If you expect
50 binary data, use this option.
51
52#### `txt.encode(obj, [buffer], [offset])`
53
54Takes a key/value object and returns a buffer with the encoded TXT
55record. If a buffer is passed as the second argument the object should
56be encoded into that buffer. Otherwise a new buffer should be allocated
57If an offset is passed as the third argument the object should be
58encoded at that byte offset. The byte offset defaults to `0`.
59
60This module does not actively validate the key/value pairs, but keep the
61following in rules in mind:
62
63- To be RFC compliant, each key should conform with the rules as
64 specified in [section
65 6.4](https://tools.ietf.org/html/rfc6763#section-6.4).
66
67- To be RFC compliant, each value should conform with the rules as
68 specified in [section
69 6.5](https://tools.ietf.org/html/rfc6763#section-6.5).
70
71After encoding `txt.encode.bytes` is set to the amount of bytes used to
72encode the object.
73
74#### `txt.decode(buffer, [offset], [length])`
75
76Takes a buffer and returns a decoded key/value object. If an offset is
77passed as the second argument the object should be decoded from that
78byte offset. The byte offset defaults to `0`. Note that all keys will be
79lowercased and all values will be Buffer objects.
80
81After decoding `txt.decode.bytes` is set to the amount of bytes used to
82decode the object.
83
84#### `txt.encodingLength(obj)`
85
86Takes a single key/value object and returns the number of bytes that the given
87object would require if encoded.
88
89## License
90
91MIT
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