Narayan Prusty, Author at QNimate

Narayan is a web astronaut. He is the founder of QScutter and QNimate. Narayan is an expert in Web Development, Intel XDK, WordPress and Web Security. He is the main author of QNimate.

Calculating Nonce for Raw Transactions in Geth

Here is the code to calculate the transaction nonce for raw transactions in Ethereum’s geth client. function getNonce(address, callback) { web3.eth.getTransactionCount(address, function(error, result) { var txnsCount = result; web3.currentProvider.sendAsync({ method: "txpool_content", params: [], […]

3 months ago http://qnimate.com/calculating-nonce-for-raw-transactions-in-geth/

Pointing Domain to AWS Elastic Load Balancing

Amazon ELB is an auto scalable load balancer that sits in front of EC2 instances and distributes traffic between them. Client communicates with ELB not with EC2 instances directly. When you create a ELB you get a domain name provided by Amazon AWS to make requests to the ELB. This domain name resolves to different […]

Image1 year ago http://qnimate.com/pointing-domain-to-aws-elastic-load-balancing/

Find Recorded Audio File Location in Cordova

Many people use the Media Plugin to record audio in cordova apps. Here is an sample code that shows how to record: var extension = null; document.addEventListener("deviceready", function(){ if(device.platform == "iOS") { extension = ".wav"; } else if(device.platform […]

1 year ago http://qnimate.com/find-recorded-audio-file-location-in-cordova/

ES6 Reflect API Tutorial

This post is a part 18 of ECMAScript 6 Complete Tutorial post series. Object reflection is an language ability to able to inspect and manipulate object properties at runtime. JavaScript already had been supporting APIs for object reflection but these APIs were not organized under a namespace and also they threw exception when they fail […]

1 year ago http://qnimate.com/es6-reflect-api-tutorial/

Express.js Middleware Tutorial

Developers who are new to Express often get confused with the difference between route handler and middleware. Therefore they also get confused with the difference between app.use(), app.all(), app.get(), app.post(), app.delete() and app.put() methods. In this tutorial I will explain the exact difference between a middleware and route handler. And also how to use the […]

Image1 year ago http://qnimate.com/express-js-middleware-tutorial/

Storing Data Locally in a Intel XDK App

This post is a part 53 of Intel XDK Complete Tutorial post series. I wrote an article on how to store data locally in cordova based apps. As Intel XDK builds cordova apps therefore the technique is same for Intel XDK also. The article is published by SitePoint.

Link1 year ago http://qnimate.com/storing-data-locally-in-a-intel-xdk-app/

Streaming File Uploads to Storage Server with Node.js

In this tutorial I will show how to stream a file uploaded by user to a file storage server(such as Amazon S3 or any other custom server) without storing file in a temporary directory. The advantage of this is that in case there is a lot of parallel uploads of large files then it prevents […]

Image1 year ago http://qnimate.com/stream-file-uploads-to-storage-server-in-node-js/

Generate Unique Number in JavaScript

Here is the code that can generate a unique number in JavaScript. function uniqueNumber() { var date = Date.now(); if (date <= uniqueNumber.previous) { date = ++uniqueNumber.previous; } else { uniqueNumber.previous = date; } return […]

1 year ago http://qnimate.com/generate-unique-number-in-javascript/

JSON.parse() throws “unexpected token” error for valid JSON

Although your JSON string is valid JSON.parse is likely to throw error. This is because JSON.parse cannot parse some special characters that are \n, \t, \r and \f. You need to escape these special characters for before passing JSON string to JSON.parse function. Here is a function that takes a JSON string and escapes the […]

1 year ago http://qnimate.com/json-parse-throws-unexpected-token-error-for-valid-json/