mt940-js

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A mt940 isomorphic Javascript parser

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# mt940-js
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> An isomorphic Javascript library for working with [MT940](#related-links) format

# [Changelog](CHANGELOG.md)

## Reading
### API
#### read(buffer, options)
* `buffer` {Buffer|ArrayBuffer} - income buffer that contains data of mt940 file.
* `options` {ReadOptions}
* returns `Promise` with list of [Statement](src/index.ts#L49).

##### ReadOptions
* `getTransactionId(transaction, index)` - a custom generator for transaction id. By default it's:
```js
/**
* @description version 0.5.x
* @param {Transaction} transaction
* @param {number} index
* @returns {string}
*/
function getTransactionId (transaction, index) {
    return md5(`${ date }${ transaction.description }${ amount }${ transaction.currency }`);
}

/**
* @description version 0.6.x+
* @param {Transaction} transaction
* @param {number} index
* @returns {string}
*/
function getTransactionId (transaction, index) {
    return md5(JSON.strinfigy(transaction));
}
```

### Node.js environment
````js
import * as mt940 from 'mt940-js';
import fs from 'fs';

fs.readFile('/path/to/your/mt940/file', (error, buffer) => {
    mt940.read(buffer).then((statements) => {
        //
    });
});
````

### Browser environment
#### Reading a local file
````html
<input type="file" onchange="onFileSelected(this.files[0])"/>
````
````js
import * as mt940 from 'mt940-js';

fetch('/url/to/mt940/file')
    .then((response) => response.arrayBuffer())
    .then((buffer) => {
        mt940.read(buffer).then((statements) => {
            // List of the Statements
        });
    });
````

## Writing
Coming soon

## Supported MT940 tags
* **:20:**
* **:21:**
* **:25:**
* **:28(C):**
* **:60(M|F):**
* **:61:**
* **:62(M|F):**
* **:64:**
* **:65:**
* **:86:**

## Related links
### JS
* [Buffer](https://nodejs.org/api/buffer.html)
* [ArrayBuffer](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer)

### mt940 specification
* [Societe Generale spec.](https://web.archive.org/web/20160725042101/http://www.societegenerale.rs/fileadmin/template/main/pdf/SGS%20MT940.pdf)
* [Sepa spec.](http://www.sepaforcorporates.com/swift-for-corporates/account-statement-mt940-file-format-overview/)
* [Deutsche Bank spec.](https://deutschebank.nl/nl/docs/MT94042_EN.pdf)

mt940-js

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