Base64 File loading, converting and saving for node.js

This is an ideal way to load and convert local and remote files to base64 either for use as a string or to save on disk.

This works with all file types!

install npm i js-base64-file

Class Methods

|method |params |description| |------ |------ |-----------| |load |path,fileName,callback |loads a local file and converts it to base64. note : path should always end with a slash | |loadSync |path,fileName |same as load, but it returns the base64 string instead of passing it to a callback. This could be slow on really large files. | |loadRemote |url,fileName,node-fetch options|loads a remote file and converts it to base64. This defaults to a simple GET request, but allows the full options from node-fetch for any type of request even with payloads| |save |data,path,fileName,callback|saves the data to the specified path and filename async callback| |saveSync |data,path,fileName |saves the data to the specified path and filename sync|

Class Instance

|callback|params|description| |--------|------|-----------| |load | err, base64Data |gives you the base64 encoded file data| |save | err, data |will pass any errors back it is unlikely there will ever be data|

Testing & Coverage

We have 98% coverage with the amazing C8 coverage tool. The only things not covered are empty default param functions. You can see the coverage details in the ./coverage/index.html file.

We use the vanilla-test testing module for super light and fast testing, and have integrated with Travis CI.

You can run the tests and explore the coverage yourself by cloning the repo and running npm test. It will automatically set everything up and run coverage for you.

Examples

You can look at and run the files in the ./example dir and run them with node ./example/{example}.js

Below are some quick copy paste examples for you.

LoadSync

    import {Base64File} from 'js-base64-file';

    const image=new Base64File;
    const file='test.png';
    const path='./';


    //this will load and convert if needed synchriouniously
    const data=image.loadSync(path,file);

    console.log(`

    SYNC: you could send this image via ws or http to the browser or save it to disk now : 

    ${data.slice(0,50)} ... ${data.slice(-50)}


    `);

Load Async callback

    import {Base64File} from 'js-base64-file';

    const image=new Base64File;
    const file='test.png';
    const path='./';


    //this will load and convert if needed synchriouniously
    image.load(path,file,asycHandler);

    function asycHandler(err,data){
        if(err){
            console.trace(err);
        }

        console.log(`

        ASYNC: you could send this image via ws or http to the browser or save it to disk now : 

        ${data.slice(0,50)} ... ${data.slice(-50)}


        `);
    }

Load Remote Await

    import {Base64File} from 'js-base64-file';

    const image=new Base64File;

    const remoteURL='https://octodex.github.com/images/';
    const remoteFile='megacat-2.png';
    const data=await image.loadRemote(remoteURL,remoteFile);

    console.log(`

    REMOTE: you could send this image via ws or http to the browser or save it to disk now : 

    ${data.slice(0,50)} ... ${data.slice(-50)}


    `);

SaveSync

    import {Base64File} from '../index.js';
    import {existsSync} from 'fs';

    const image=new Base64File;

    const remoteURL='https://octodex.github.com/images/';
    const remoteFile='megacat-2.png';

    const localPath='./';
    
    //loading an image
    const data=await image.loadRemote(remoteURL,remoteFile);

    //saving the image
    image.saveSync(data,localPath,remoteFile);

    console.log(existsSync(localPath+remoteFile));

Save Async Callback

    import {Base64File} from 'js-base64-file';
    import {existsSync} from 'fs';

    const image=new Base64File;
    const file='test.png';
    const path='./';
    const copyAsyncFile=`copy-async-${file}`;


    //load a file
    const data=image.loadSync(path,file);

    //save the file
    image.save(
        data,
        path,
        copyAsyncFile,
        function(err,data){
            if (err||!existsSync(`${path}${copyAsyncFile}`)){
                test.fail();
            }

            console.log(existsSync(path+copyAsyncFile));

            //call next test here
        }
    );

It's that simple! And it will work with any file type!