Consuming Web API JSON Data Using curl and jq

curl-jq

Hey everyone!  I decided to put a few extra batteries in the background color of the article image above. 🙂  I’m actually pretty charged up about our topic today, particularly about jq, which is a lightweight and flexible command-line JSON processor with “batteries included”.

JSON has become the lingua franca for exchanging data on the web, and we (as developers) need to know how to process JSON data so we can be positioned for the present and for the future. We recently learned about Consuming Node.js Microservices Created with Stdlib which provided a high-level tour covering several methods for parsing and processing JSON data. Today, we’re zooming in and learning more about consuming Web API JSON data from bash using curl and jq. Once again, we’ll be consuming data from a microservice created with the excellent stdlib platform. Our learning, however, will be universally applicable for consuming Web API JSON data from any http endpoint. Most importantly, we’re going to have fun in the process! 🙂 Continue reading

Consuming Node.js Microservices Created with Stdlib

stdlib-consumers
In our last article, we learned how to create Node.js microservices using Polybit’s stdlib platform. We created a fabulous (IMHO 🙂 ) GPS service that enabled us to retrieve the name of a city based on its GPS coordinates. Today, we’re going to learn how to consume data returned from this stdlib GPS microservice using several methods. While the information presented here is specific to consuming Polybit stdlib microservices, many aspects of this article will be generally applicable for consuming Web API JSON data from any http endpoint. Strap on your seatbelts as we embark on a whirlwind tour to learn about consuming JSON data from a variety of contexts…and I’m talking about some serious variety! Continue reading

Node.js: Playing Sounds to Provide Notifications

playing sounds

In a previous tutorial, we learned how to send email notifications Using Nodemailer and Gmail. In today’s session, we will learn how to play sounds using Node.js. As a bonus, we will learn how to continue to play a sound until our notification has been acknowledged by pressing a key on the keyboard. How does that sound? 🙂 Enough bad puns! 🙂 Let’s get started! Continue reading

Creating Node.js Microservices with Ease Using Stdlib

stdlibMicroservices and serverless architectures are all the rage in the software industry. After working with Polybit’s amazing stdlib platform, I am clearly seeing the value of this promising technology! Today, I will introduce you to stdlib. I encourage you to work alongside me as we leverage stdlib to build a microservice that we can consume in a variety of contexts. Let’s get started with this fabulous technology! Continue reading

Upgrading to more recent versions of Node.js on the Raspberry Pi

upgrading nodejs

I’ve received questions from readers of my Beginner’s Guide to Installing Node.js on a Raspberry Pi wanting to know how to upgrade to more recent versions of Node.js on the Raspberry Pi.  The steps are quite easy and can be adapted to other Debian variants as well including Ubuntu.  I’m assuming you followed the steps in my Beginners’ Guide, especially under the “Install Node.js” section where we update the Raspbian/Debian package repository to include the Node.js binaries provided by NodeSource.  Let’s get started! Continue reading

Beginner’s Guide to Installing Node.js on a Raspberry Pi

Learning through Making (LTM) logo

This article has been updated to cover the installation of the latest version of Node at the time of this writing which is Node 7.x.

In this installment of our LTM (Learning through Making) series of Node.js tutorials, we’re going to get Node up and running on a Raspberry Pi 3 or Pi 2. With the Raspberry Pi 3, you won’t need to buy a separate USB Wi-Fi adapter. I’m focusing on the Raspberry Pi 3/Pi 2 rather than older versions such as the Raspberry Pi B+ since these are the latest models at the time of this writing.  The Raspberry Pi 3, for example, sports a 1.2 GHz quad-core ARMv8 chip with 1 GB of RAM versus the Raspberry Pi 1 Model B+’s 700 MHz single-core ARMv6 chip with 512 MB RAM.

The instructions provided here are for installing Node.js on a Pi 3 (ARMv8) or Pi 2 (ARMv7) rather than other models based on the ARMv6 chip such as the Raspberry Pi 1 Model B, Raspberry Pi Model B+ or the Raspberry Pi Zero.  A majority of this installation guide should still prove useful for other Raspberry Pi systems besides the Pi 3 and Pi 2; however, the final steps focused on the installation of Node.js will not work for these systems based on the older ARMv6 architecture.

This tutorial is useful for anyone wishing to successfully install a Raspberry Pi 3/Pi 2 system, even if they are not interested in Node.js since the Node.js installation happens in the final steps of the tutorial.  But, why would you not want to install Node.js? 🙂  Let’s get started! Continue reading

How to Install or Upgrade to Node.js v7 on the Raspberry Pi

node.js logoIt’s here! The Node.js Foundation has released version 7 of Node.js, an open-source, cross platform JavaScript runtime environment. Node.js provides an event-driven architecture capable of asynchronous I/O and allows us to build a gamut of software from highly scalable networked applications to CLI (Command-line Interface) applications. It’s a great fit for building IoT systems, and there’s never been a better time to get in the Node game with the Raspberry Pi!

Our friends at NodeSource host a package repository that makes installing and maintaining Node on the Raspberry Pi easy.  Keep reading to learn how to get started. Continue reading

Node.js: Sending Email Notifications Using Nodemailer and Gmail

Nodemailer

We all want to be in the loop and notified when certain events occur within our Node.js programs. For example, email notifications can be very important for creating situational awareness with IoT systems we develop that interact with our physical world. Email communication can be used to deliver messages to our inboxes as well as to deliver text messages in order to enable us to take more immediate action.

In today’s tutorial, we’ll walk through the steps of using the amazing Nodemailer package which has become the de facto standard for sending email messages in the Node.js world. Let’s get started so we can start seeing our own custom messages flow to our inbox! Continue reading

Getting Started with YAML in Node.js using js-yaml

YAML

In this tutorial, we harness the power of YAML for use within Node.js. As described on the official YAML site, YAML (YAML Ain’t Markup Language) is a “human friendly data serialization standard for all programming languages”. YAML and JSON are closely related. In fact, all JSON syntax is valid YAML as of the YAML 1.2 spec, but not all YAML syntax is valid JSON. YAML is a superset of JSON. Continue reading

Node.js IoT: Logging Data That Is Out of This World

IoT loggingThe ability to log data is an important capability in IoT applications. In this tutorial, we learn how to use Node.js to log data by utilizing built-in Node modules. There are certainly excellent logging modules available including pino and Winston (see my Winston tutorial here); however, our goal today is to deepen our knowledge of Node by implementing some simple logging code ourselves in order to become better Node developers. Continue reading