# js-file
 transformation functions of file/blob/base64
 
## blobToBase64
```javascript
const b64Data = await blobToBase64(blob); 
```
## urlToBlob
```javascript
const blob = await urlToBlob(url); // url is a dataUrl, like: 'data:application/json;base64,ewogICJoZWxsbyI6ICJ3b3JsZCIKfQ==';
```
## base64ToBlob
```javascript
const blob = await base64ToBlob({ b64Data="", contentType="", sliceSize=512, name=""}); // b64Data is required;
```
## fileUrlToUrl(fileUrl)
```javascript
const fileUrl = 'https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Falco_peregrinus_-_01.jpg/1920px-Falco_peregrinus_-_01.jpg';
const url = await fileUrlToUrl(fileUrl);
```
## downloadFile(fileUrl, name)
``` javascript
// autodownload
const fileUrl = 'https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Falco_peregrinus_-_01.jpg/1920px-Falco_peregrinus_-_01.jpg';
downloadFile(fileUrl, name);
```