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125 lines
4.1 KiB
Markdown
125 lines
4.1 KiB
Markdown
3 years ago
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# get-stream
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> Get a stream as a string, buffer, or array
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## Install
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```
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$ npm install get-stream
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```
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## Usage
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```js
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const fs = require('fs');
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const getStream = require('get-stream');
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(async () => {
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const stream = fs.createReadStream('unicorn.txt');
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console.log(await getStream(stream));
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/*
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,,))))))));,
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__)))))))))))))),
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\|/ -\(((((''''((((((((.
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-*-==//////(('' . `)))))),
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/|\ ))| o ;-. '((((( ,(,
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( `| / ) ;))))' ,_))^;(~
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o_); ; )))(((` ~---~ `:: \ %%~~)(v;(`('~
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; ''''```` `: `:::|\,__,%% );`'; ~
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| _ ) / `:|`----' `-'
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______/\/~ | / /
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/~;;.____/;;' / ___--,-( `;;;/
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/ // _;______;'------~~~~~ /;;/\ /
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// | | / ; \;;,\
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(<_ | ; /',/-----' _>
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\_| ||_ //~;~~~~~~~~~
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`\_| (,~~
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\~\
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~~
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*/
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})();
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```
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## API
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The methods returns a promise that resolves when the `end` event fires on the stream, indicating that there is no more data to be read. The stream is switched to flowing mode.
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### getStream(stream, options?)
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Get the `stream` as a string.
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#### options
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Type: `object`
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##### encoding
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Type: `string`\
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Default: `'utf8'`
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[Encoding](https://nodejs.org/api/buffer.html#buffer_buffer) of the incoming stream.
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##### maxBuffer
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Type: `number`\
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Default: `Infinity`
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Maximum length of the returned string. If it exceeds this value before the stream ends, the promise will be rejected with a `getStream.MaxBufferError` error.
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### getStream.buffer(stream, options?)
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Get the `stream` as a buffer.
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It honors the `maxBuffer` option as above, but it refers to byte length rather than string length.
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### getStream.array(stream, options?)
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Get the `stream` as an array of values.
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It honors both the `maxBuffer` and `encoding` options. The behavior changes slightly based on the encoding chosen:
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- When `encoding` is unset, it assumes an [object mode stream](https://nodesource.com/blog/understanding-object-streams/) and collects values emitted from `stream` unmodified. In this case `maxBuffer` refers to the number of items in the array (not the sum of their sizes).
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- When `encoding` is set to `buffer`, it collects an array of buffers. `maxBuffer` refers to the summed byte lengths of every buffer in the array.
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- When `encoding` is set to anything else, it collects an array of strings. `maxBuffer` refers to the summed character lengths of every string in the array.
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## Errors
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If the input stream emits an `error` event, the promise will be rejected with the error. The buffered data will be attached to the `bufferedData` property of the error.
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```js
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(async () => {
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try {
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await getStream(streamThatErrorsAtTheEnd('unicorn'));
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} catch (error) {
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console.log(error.bufferedData);
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//=> 'unicorn'
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}
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})()
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```
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## FAQ
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### How is this different from [`concat-stream`](https://github.com/maxogden/concat-stream)?
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This module accepts a stream instead of being one and returns a promise instead of using a callback. The API is simpler and it only supports returning a string, buffer, or array. It doesn't have a fragile type inference. You explicitly choose what you want. And it doesn't depend on the huge `readable-stream` package.
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## Related
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- [get-stdin](https://github.com/sindresorhus/get-stdin) - Get stdin as a string or buffer
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---
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<div align="center">
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<b>
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<a href="https://tidelift.com/subscription/pkg/npm-get-stream?utm_source=npm-get-stream&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
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</b>
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<br>
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<sub>
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Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
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</sub>
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</div>
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