Javascript Blob To String

fillRect(10,10,60,60); Now using canvas toDataURL("image/png") get the png image url and populate the src attribute of required image. Venta de cuilo, cuilos, cobaya, cobayas, conejillos de india, conejillo de india. createTableService(accountName, accountKey); Blob Storage. convert blob to string and display string value in visualforce page in salesforce. If we are downloading the data from web client library, we can create the Byte array Like below and then we can Upload it to the Blob. For some reason, my old method using charCodeAt(i) stopped working, showing some weir characters when opening the file. The typeofoperator is not a variable. Converting a String in a Blob I understand the parameter must be a blob not a string. Viewed 12 times 0. However if I navigate to the swagger ui and "Try it now" the response is a blob of text instead of downloading the file. In this tutorial, you create a Data Factory pipeline that copies data from Azure Blob Storage to Azure SQL Database. Today we discuss related to important topic related to string to array convertion using javascript. You can "convert" a binary value into a string either by using a SQL Override which "converts" the binary port into a string or by programming a small Java Transformation which takes the binary value as its input and tries to create a string out of this byte array. readAsDataURL() method. So basically you set up the JTX to have one Binary port and one string port as its input and one string port as its output; the Binary port receives the BLOB, the string input port receives the name of the character set (look them up in the Javadoc of the JRE if you need to), then you have basically the following lines of code on the On Input. ktr JavaScript - Base64 Decoder and Encoder. December 10th 2016; 136. As expected, we must build a tree for each container. Here we’d be making use of the REST API to simplify things (instead of using Windows Azure Storage library ) in our Plugin. blob-util is a Blob library for busy people. The default value is size. A response URL is a URL for which implementations need not store the fragment as it is never exposed. I want to convert Blob to ByteArray in Javascript. JavaScript engines will decode the source (which is most often in UTF-8) and create a string with two UTF-16 code units. Convert blobs to and from base64 data url strings. Option 3: Source Zip Download a zip of the code via GitHub or PyPi. "Does anyone know how to convert a BLOB (which is RTF format) into a string? I found this code to do it, but it doesn't work. JavaScript preprocessors can help make authoring JavaScript easier and more convenient. A new Blob object containing the specified data from the source Blob. This completed the process. Mix Auto Upholstery Steve Mix Owner/trimmer Santa Rosa, CA. Answer: The following program selects CLOB data and puts in VARCHAR2 variable:. Convertible Tops, Custom and Factory Interiors & Repairs. Upload File to Windows Azure Blob Storage using Windows Azure Mobile Services This demonstrates how to store your files such as images, videos, docs or any binary data off device in the cloud using Windows Azure Blob Storage. The constructor accepts two arguments. I will be using Apache Commons Codec library to achieve the ‘Convert Image to String and String to Image in Java’. I get about 20-30 first characters of each entry. Of course, for ad-hoc storage tasks, Azure Storage Explorer is still a great tool, but if as part of a deployment or maintenance task you need to upload or download blobs from containers, the CLI is a great way to automate that process and ensure it is reliable and repeatable. Note : Working in weird environments is not a design goal of this code. BLOB storage can be accessed from anywhere in the world via HTTP or HTTPS. We can do that from a JavaScript client because we’ve. I have written a JavaScript library called FileSaver. The BLOB data field name must immediately follow the SELECT keyword. A blob: URL does not refer to data the exists on the server, it refers to data that your browser currently has in memory, for the current page. This is a snippet for the code that I want to do Blob to Base64 string: This commented part works and that when the URL generated by this is set to img src it displays the image: var blob = items. Javascript is a client-side language. This is reference information for Azure Functions developers. Powered by Create your own unique website with customizable templates. Block blobs represent binary data that has been segmented into one or more blocks to enable ease of transmission over a network, and sensible management of large data files. Test case created by Don Park on 2013-7-13. Mix Auto Upholstery Steve Mix Owner/trimmer Santa Rosa, CA. In addition to that, it is possible to select a random string from an area inside the array? For example I just want want a random string from Mario to Yoshi so Pac Man and Sonic can't even show up?. It is simple to compose an SVG image as a string of text, convert the string to a blob, and use the blob as an image element source…with one "gotcha". Every byte is represented by an integer in the range [0. Processing Text and Binary (Blob, ArrayBuffer, ArrayBufferView) Payload in WebSocket - (TOTD #185) Guest Author The WebSocket API defines different send(xxx) methods that can be used to send text and binary data. Download and install the Microsoft Azure Storage Explorer. Creates a new File. First, i understand that this isn't the best method to be storing string/long text format, but it was best for my method and i suspect i'm not the only one who will want to do this!. Like other binary types, BLOB strings are not associated with a code page. In fact, Safari nightlies have already disabled. Additionally instead of failing it tries to mimic and return blob reference passed in by caller by passing it back as a binary. drawImage(image, 0, 0); to draw the result from socket directly to the canvas, but, image. When customers pass a URL string into XXXURL classes constrcutor, the URL string may already be URL encoded or not. Since blobs can store binary data, they can be used to store images or other multimedia files. I clicked on +Options above the table list, selected "Show BLOB contents" and clicked GO, but, all date fields still display as [BLOB 19]. In my cypress test, I have submitted a request and in the response the body returned as blob. I'm using Imageresizer in combination with BlobStorage. It typically comprises images, audio, or any other file. Preparation code < script > Benchmark. If you are converting from String to BLOB for DB2 you can see at the DB2-ODBC bridge. createObjectURL is to convert a blob into a base64-encoded string. Typed Arrays are a relatively recent addition to browsers, born out of the need to have an efficient way to handle binary data in WebGL. 000 blobs metadata. -- create_function_blob2string. To connect a server with self-signed certification, you need to add trusty to config explicitly. What you're doing is conceptually wrong. So, all strings (string objects) have access to that method!. generateDigest('SHA-256', Blob. In java it's an interface, so you must see the documentation of DB2-ODBC bridge you use. The join method converts the elements of an array to strings, concatenates them, and returns the resulting string. Skip to main content. This can be useful for things like: Storing object data in a database Outputting object data to the console for debugging Sending object data over AJAX or to an API The simple syntax for converting an object to […]. Javascript Create Blob From Image Url. Uint8Arrays cannot change size after creation. It also provides an attribute to retrieve the size of the chunk of data. The goal here is to convert/transform Image into Base64 String and convert/transform Base64 String back to Image without compromising a Image data. A blob is a collection of binary data stored as a single entity. ActiveWidgets is a javascript library for creating user interfaces. When browsing a table, all of the DATETIME and DATE fields display as [BLOB 19]. Jump to: A Blob object represents a file-like object of immutable, raw data. This worked great when creating a. I used this SQL to create a function. I have binary data that needs to be stored in a BLOB field in a SQL-database. BLOBs are typically not updateable with Static or Forward-only cursors on ODBC datasources. secretArn — (String) The name or ARN of the secret that enables access to the DB cluster. We use cookies for various purposes including analytics. Using Large Objects An important feature of Blob , Clob , and NClob Java objects is that you can manipulate them without having to bring all of their data from the database server to your client computer. When I do a select , I want to view the data store in this field. Suppose you have an employee screen and whenever the user opens that screen to edit or view record, you want to display employee’s payslip whether it is in image format or in PDF format. Blobs are used in many Apps Script APIs that take binary data as input. And what’s more important – we can use this encoding in “data-urls”. 추가로 File 인터페이스 는 Blob 인터페이스 의 모든 특성들을 상속받는다. I've followed the instructions here to add a search service to the blob store except I added the metadata and not the blob content. I've came across a website that serves the video in partial block. That will return a 404 if the blob doesn’t exist, and if the blob does exist, it only returns the headers that would typically come with the blob contents. Hashed_String__c = EncodingUtil. If the data is too large then u can use CLOB format. HTML is the World Wide Web's core markup language. Block blobs represent binary data that has been segmented into one or more blocks to enable ease of transmission over a network, and sensible management of large data files. debug and get the output you expect. Using binary data with REST. Display an image stored in a BLOB in. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). But its 2 clicks instead of 1 since the user has to select the QA dn then select the link that is being rendered in the VF page. 9am-3pm or by appt. I use the jdbc to get the geometry data and use STRUCT and Datum class to get all members of the st_geometry data. The Data Type of typeof. will try that. It compiled with no errors. Note, blobs really are mutable (their internal state can in fact be mutated). Form object, which was passed from our client side. The large file is stored as a collection of binary data into a storage system. Based on this information, if needed we can trigger the download. js v2 to upload, download, and list blobs with Azure Blob storage. The result will be a String consisting of random characters, representing the image. JavaScript to program the behavior of web pages. The element remains hidden during the process and is removed from the DOM immediately after the click() call. slice( start, next_slice ); }. Like other binary types, BLOB strings are not associated with a code page. However the performance can be improved a little by processing the byteCharacters in smaller slices, rather than all at once. The default value is size. Add the initial JavaScript code Next, paste the following code into the element shown in the previous code block, replacing the placeholder comment. Thanks [Route("/hellozip")] public class HelloZip { } public object Get(HelloZip request) { string tempPath = Path. If your BLOB is stored as text, such as a SQL Server text field, you can pass the BLOB as a string parameter. contentType Optional The content type to assign to the new Blob; this will be the value of its type property. It must be that you can send data as a blob, but it cannot be manipulated manually (which I need to do to paint onto a canvas). I've came across a website that serves the video in partial block. How to convert BLOB to Byte Array in java? Java 8 Object Oriented Programming Programming You can contents of a blob into a byte array using the getBytes() method. It's been around since Chrome 8, FF 6, and IE 10 but has never shipped in Safari,and likely never will. Hello, I'm posting this here in case anyone else comes across this and needs a solution to reading string data stored in blobs. -- create_function_blob2string. While developing a JavaScript application, you will sometimes want to serialize your data into a plain string. You can use single or double quotes:. Blob Service(string, string, string | Storage Host, string, string): Creates a new BlobService object. debug internally uses String. What is this Blob/Shape-thing? 2. The Flickr JSON is a little confusing, and it doesn’t provide a direct link to the thumbnail version of our photos, so we’ll have to use some trickery on our end to get to it, which we’ll cover in just a moment. Although the length is 0, the value is not NULL. This characters can then be save to the database. function dataURItoBlob(dataURI, callback) {// convert base64 to raw binary data held in a string // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this. A string is a sequence of one or more characters that may consist of letters, numbers, or symbols. When used in conjunction with the above data structures, the FileReader interface can be used to asynchronously read a file through familiar JavaScript event handling. May 24, 2015 — by Jan-Philip Gehrcke For an AngularJS-based web application I am currently working on, I want to put arbitrary text information into a URL, send it to the client, and have it decoded by the browser. HTML Pages with CSS and JavaScript. Im trying to convert the ntext column to string format in scriptcomponent , I cant get this to work not sure where i messed up. The server should return valid JavaScript that passes the JSON response into the callback function. An important thing is related to the number of blobs that will be fetched when we make a call. Conversion dataUri string to Blob: dataUri2Blob. I made a pipe to transform my base64 string. w3schools. By David Walsh on August 13, 2015. com THE WORLD'S LARGEST WEB DEVELOPER SITE. When browsing a table, all of the DATETIME and DATE fields display as [BLOB 19]. In Oracle, EMPTY_BLOB() function allows you to assign an empty value (with 0 length) to a BLOB column. Though, this is a trivial example and actual object could be more complex, it demonstrate the process of creating Java object from JSON String. fillStyle="#ff0000"; context. This package converts a Readable Stream into a Blob URL. Seeing as JavaScript has 16-bit strings, I packed two bytes per character. The configuration pattern in this tutorial applies to copying from a file-based data store to a relational data store. JavaScript to program the behavior of web pages. Normally, the API would provide a json-object with a link to the pdf, which can then be used to open a new browser tab/window and the browser or platform takes care of the rest. In other words, you can't reliably use String. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation). The function injects an element into the body, sets it URL to a Blob value to the text content of the destination file, and clicks the element to trigger the download. It offers a small set of cross-browser utilities for translating Blobs to and from different formats: tags base 64 strings. However, the filewriter. Can anyone suggest me the possibilities of this. Every byte is represented by an integer in the range [0. You kinda shouldn't be using string insertion "\(…)" for a string like this, because the insertion uses String initializer "String(describing:)", which in turn can use any of several methods to get the inserted string, and it's certainly possibly that the inserted string is a description, not the contents. I could see the correct content of the column by changing the EDIT from M to C in the FORM (also the WIDTH from 20 to 1000) and to export it as REPORT, but in QMF it is possible in the SELECT query a BLOB column as if it. Convert Image to Data URI with JavaScript Building Resilient Systems on AWS : Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS. But if an app is long-living, then that doesn't happen soon. May 24, 2015 — by Jan-Philip Gehrcke For an AngularJS-based web application I am currently working on, I want to put arbitrary text information into a URL, send it to the client, and have it decoded by the browser. HASVALUE THEN; In older versions, earlier than NAV 2009, you had to call CALCFIELDS before you could check HASVALUE, which – if you think of it, did not make much sense. In the last post Azure Storage Account Part 1: What is blob? of this series, we have seen what is Azure Storage Account and how to manage your files in a blob storage, how to upload and access the files through Azure portal. CursorFactory factory, int flags, DatabaseErrorHandler errorHandler) This method only opens the existing database with the appropriate flag mode. This should have been simple but was suprising hard to get working (like much of Azure). Answer: The following program selects CLOB data and puts in VARCHAR2 variable:. These actions can target items in different tables, but not in different AWS accounts or Regions, and no two actions can target the same item. Instead, it must first be sanitized with a function such as [man]mysql_real_escape_string/man. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system. Using binary data with REST. SO instead of taking object reference of json, it taking reference as string (it is entering -username in text box) It is working fine If I directly pass username in the script. 0-preview" NuGet package Applying the ModelCommand pattern I was able to create a command that enables us to upload a serializable object as JSON and store it in an existing Blob Container. The problem is there are too many files present in blob store are not showing in Nexus Console. This solution consists in converting a JavaScript's native UTF-16 string into a UTF-8 string and then encoding the latter into base64. Here we have given a list of SQL 2003 standard data types with a short description and discussed data types of various databases. The base64 string will be processed and converted into a writable Blob. We have to convert the image to a BASE64 string and then invoke the web-service method and input it. Methods inherited from class java. The default value is size. then(function(snapshot) { console. js development by creating an account on GitHub. For GetBlobReferenceFromServer to work, the blob must be present in the blob storage. 6+, Internet Explorer 10+, Safari 6+). That encoding represents binary data as a string of ultra-safe “readable” characters with ASCII-codes from 0 to 64. MySQL named their binary format after the already used word blob, not the other way around. In java it's an interface, so you must see the documentation of DB2-ODBC bridge you use. I suspect that the reasoning behind this is because they chose not to write byte order marks and the 3 byte mark for UTF-8 isn't easily encoded into the javascript string to be written to disk. A new Blob object containing the specified data from the source Blob. string to Uint8Array JavaScript performance comparison. I have the following sql to search thru a BLOB field which has all the program code. Here is quick sample to upload blob files to Azure Storage from a browser directly and then process it the server side. toPdf(stringToConvert) Creates a binary object out of the given string, encoding it as a PDF file. Im trying to convert the ntext column to string format in scriptcomponent , I cant get this to work not sure where i messed up. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system. If you are converting from String to BLOB for DB2 you can see at the DB2-ODBC bridge. When customers pass a URL string into XXXURL classes constrcutor, the URL string may already be URL encoded or not. How to create a file and generate a download with Javascript in the Browser (without a server) May 12th 2019; 290. 6K; The first solution that you may implement and probably the only idea that will occur to everybody, when you need to upload a Base64 image into the server, is to upload this file as a string and then convert it to a file in the server side. The elements of fileParts must be of the types ArrayBuffer, ArrayBufferView, Blob, or String. This is useful in the scenario when you know that the blob exist in storage and would want to find out the type of blob - Block Blob or Page Blob. You kinda shouldn't be using string insertion "\(…)" for a string like this, because the insertion uses String initializer "String(describing:)", which in turn can use any of several methods to get the inserted string, and it's certainly possibly that the inserted string is a description, not the contents. BLOB stands for BINARY large object while you are inserting text. nls_language Optional. When you create a Blob URI, the browser holds onto the referenced memory until the document is unloaded; or, until you explicitly revoke the URL. I could see the correct content of the column by changing the EDIT from M to C in the FORM (also the WIDTH from 20 to 1000) and to export it as REPORT, but in QMF it is possible in the SELECT query a BLOB column as if it. Download content from a Blob. This also grants that converting a pure ASCII string to base64 always produces the same output as the native btoa(). "Does anyone know how to convert a BLOB (which is RTF format) into a string? I found this code to do it, but it doesn't work. js or other javascript platforms (multioperability), you'll find that some methods decide to return something different than a string. If you don't pass an argument to the join method, a comma will be placed between the values in the resulting string, as shown here:. We can do that from a JavaScript client because we’ve. Preparation code < script > Benchmark. Below is an example that converts a string into a byte array. Uploading large files to Azure Blob Storage through REST API Posted on January 9, 2014 May 3, 2015 by trailmax I did write about uploading files to Azure Storage via REST API before. The data is annotation data that an application stores. Azure Storage SDK V10 for JavaScript - Blob. Convert Image to Data URI with JavaScript Building Resilient Systems on AWS : Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS. Both solution will work for small files. Return value. jsPerf — JavaScript performance playground What is jsPerf? jsPerf aims to provide an easy way to create and share test cases, comparing the performance of different JavaScript snippets by running benchmarks. CREATE OR REPLACE PROCEDURE PROD. JavaScript in a browser: create a binary blob from a base64-encoded string, and decode it using UTF-8. The CDN can be used for offloading content to a globally distributed network of servers, ensuring faster throughput to your end users. The problem is there are too many files present in blob store are not showing in Nexus Console. Now that you know more about REST than you ever thought you wanted to, let’s talk about writing code to make a REST call, specifically using the Azure Storage Services REST API. a String representation of a JavaScript object to. saving BLOB to mysql: I don't know what you mean by 'save actual image'. While many of the recent public announcements have been focused Azure Websites, Deployment from Source Control, and the new general availability of Azure Virtual Machines, one of the core features of the Azure platform remains storage. In this tutorial, I'll show you how to do that in a couple minutes! To create a text file from javascript, we'll need to use Blob object. blob-util is a Blob library for busy people. javascript,function,session. If you are converting from String to BLOB for DB2 you can see at the DB2-ODBC bridge. tl;dr - blob URL sounds like the binary you want to get but there might be easier way to get the video. If you want to count the number of Unicode characters in a JavaScript string, or create a string based on a non-BMP Unicode code point, you could use Punycode. Blobs are immutable objects that represent raw data. Skip to main content. I'm trying to POST lat/longs to a database that feeds Portal. This in turn can be converted to a Blob by wrapping it in an array and passing it to the Blob constructor. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system. In the example, we wrote a small Azure function app that, once stitched in, get triggered on a new upload to. The function injects an element into the body, sets it URL to a Blob value to the text content of the destination file, and clicks the element to trigger the download. Use the Angular-Cli to create a new Angular project. Remove; In this conversation. 5 License : JSZip is dual-licensed. Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data. So please help fill my gaps: 1) chopping or blobs as the default strategy ? * jBPM 3's capability to chop a blob into discrete sized chops and store a list of those chops turned out to be very portable * i thought that oracle was one of the most difficult db's with respect to plain BLOBs. Here we have given a list of SQL 2003 standard data types with a short description and discussed data types of various databases. Convert VARBINARY (BLOB) to Base64 String using T-SQL. It is impossible with JavaScript to put a custom file (Blob) into file input, but with this approach, you can now just do a input. A Blob object represents a file-like object of immutable, raw data. getBytes() Byte[] Gets the data stored in this blob. That means that for each test, a corresponding property will be added. JavaScript preprocessors can help make authoring JavaScript easier and more convenient. openDatabase(String path, SQLiteDatabase. The value of this field is a long string but it is stored as blob in db. actually i just tried printing the xml data only by getting the bytes from input stream but i gave me weird output. For more information, see the FAQ. // Raw string is the default if no format is provided var message = 'This is my message. This also grants that converting a pure ASCII string to base64 always produces the same output as the native btoa(). In the drop-down list box, select your Storage Account. Blob - Allows for slicing a file into byte ranges. The constructor accepts two arguments. plotly charts are described declaratively in the call signature of plotly::plot_ly, plotly::add_trace, and plotly::layout. A blob is a collection of binary data stored as a single entity. x version…. JSON is a string representation of an object, not an object itself. 9am-3pm or by appt. An important thing is related to the number of blobs that will be fetched when we make a call. zip files using JavaScript. Base64 encode your data in a hassle-free way, or decode it into human-readable format. length` replacement that only counts full Unicode characters. JavaScript preprocessors can help make authoring JavaScript easier and more convenient. 0 If this is your first visit, be sure to check out the FAQ by clicking the link above. If a Blob, File, or Uint8Array isn't available, you can use the putString() method to upload a raw, base64, base64url, or data_url encoded string to Cloud Storage. Convert string to binary and binary to string in C# Posted on March 19, 2013 by CooLMinE 6 Comments The following two snippets allow you to convert a string to binary text and also to convert binary back to string. _file has higher priority then the original. Upload files to the server using Javascript and MVC WebAPI 19 August 2014 Comments Posted in ASP. Instances of Blob are immutable and implement java. Re: how to convert oracle BLOB to String 807588 Feb 2, 2009 2:09 PM ( in response to 807588 ) thanks. This makes it an efficient way to test for the existence of a blob. Many common functions in Azure with PowerShell are difficult to locate across the internet. Is there any way convert the blob into json or plain text. The configuration pattern in this tutorial applies to copying from a file-based data store to a relational data store. I'm trying to POST lat/longs to a database that feeds Portal. We need to do this because “person” is a complex object and not a primitive JavaScript value, such as a string. When serialized, the exclude fragment flag is set, meaning implementations ca. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. How to convert a String to an InputStream object in Java? How to find the unicode category for a given character in Java? How to print a formatted text using printf() method in Java? How to find the number of days in a month of a particular year in Java? Importance of deepToString() and asList() methods in Java? A Boolean Array Puzzle in C?. Promise - A. 4 Audience. The first argument is an ODBC connection string. The value is a text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16LE). This is reference information for Azure Functions developers. Convert Image to Data URI with JavaScript Building Resilient Systems on AWS : Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS. Download JavaScript Client library for Azure Storage. The elements of fileParts must be of the types ArrayBuffer, ArrayBufferView, Blob, or String. SQLite compiled to JavaScript through Emscripten. PostgreSQL STRING_TO_ARRAY()function with Example : This function is used to split string into array elements using supplied delimiter and optional null string. A URL’s port is either null or a 16-bit unsigned integer that identifies a networking port. HTML Pages with CSS and JavaScript. The contents are initialized to 0. JavaScript - Access database connection metadata. The base64 string will be processed and converted into a writable Blob. This makes a difference on disk. base64Encode(b); You will have to do the base 64 decode before using the digest too. The below method will encode the Image to Base64 String. blur() method to remove focus from the form element. TransactWriteItems is a synchronous write operation that groups up to 25 action requests. If ending is set to 'native', the line endings in the blob will be converted to the system line endings, such as '\r\n' for Windows or '\n' for Mac. javascript,function,session. The goal here is to convert/transform Image into Base64 String and convert/transform Base64 String back to Image without compromising a Image data. Here is the javascript code to draw a simple square: var canvas = document. The function injects an element into the body, sets it URL to a Blob value to the text content of the destination file, and clicks the element to trigger the download. InsertFDataBlob(V_MYBLOB BLOB) AS BEGIN passing SYS. It offers a small set of cross-browser utilities for translating Blobs to and from different formats: tags; base 64 strings; binary strings; ArrayBuffers; data URLs; canvas; It's also a good pairing with the attachment API in PouchDB. 1 big blob to base64 asynchronously using FileReader's readAsDataURL 2 big base64 to blob asynchronously using atob, ArrayBuffer and String's charCodeAt 3 big blob to base64 asynchronously using FileReader's readAsArrayBuffer and String's fromCharCode 4 small blob to base64 asynchronously using FileReader's readAsDataURL 5 small base64 to blob. In the given example, firstly we have created an ActiveXObject object which is used to enable and return a reference to an Automation object and used it with the CreateTextFile(), a JavaScript method , which generates a file.