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Nodejs print how to#
Nodejs print code#
Nodejs print series#

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Otherwise, all output after that time will be the color that we chose. We then need to accomplish two things: first, we must change the color of our text to what we want, and second, we must reset the color of the console back to what it was before we changed it. In this case, we use it to tell the console that we want to change the color. However, if we send an escape character ( \x1b) and a certain sequence ( [33m )to the console, the console actually catches the sequence before printing it, thus allowing basic terminal configuration. Normally, our console prints the text that we supply to it via console.log.

Nodejs print code#

We must understand how we can use an escape code to signal to the console that we want to change the output’s color. Programs producing text outputs have been around for decades, so the standards involved that let us make these color changes can feel a little primitive. To use console colors in our Node.js app, we must first understand what’s happening under the hood. Implementing console colors in Node.js apps To give our users the right impression, we can use visual aspects to clearly indicate if everything worked as intended or if something failed.

Nodejs print series#

If this script ran as part of a scheduled operation or as a part of a larger series of scripts, there’s a good chance that people would skip to the last line, and understand All finished as everything working as intended.

Nodejs print how to#

If you read the output as the creator of the program, you know what to look for, see that there are quite a few connection attempts before the connection succeeds, with only a partial result set received, and you know how to fix it.īut, if you work in a team and other people use this script, different people can interpret the results differently. Whatever the reason may be, the output of our simple console Node.js app looks like this: Maybe we’re incredibly busy and don’t feel like we have the time to add colors to our app, or it simply doesn’t cross our minds. However, in an app like this, we’d be tempted to write text as an output to our console. We’re not actually doing any of the heavy-lifting when connecting to these endpoints, rather, we’re simply producing an output that we can normally expect to see from an app like this. Let’s imagine our example app below uses Node.js to connect to an endpoint and retrieve some data. Issues with a lack of console color in Node.js apps

Implementing console colors in Node.js apps.

Issues with a lack of console color in Node.js apps.

In this article, we’ll learn how to implement console colors and how to use Chalk, Colors.js, and Color-CLI to help us. This means that it’s easy to clutter your view of the app or miss important bits of information. But, by default, a Node.js app’s output renders as simple white text on a black background. Sometimes if you don’t need the complexity of writing a UI, the console output is enough. Since the rise of Node.js, we’ve seen more and more console apps released than ever before. While you can still use the older version of Color.js, use it with caution or use one of the other alternatives mentioned in this article.

Using console colors with Node.jsĮditor’s note: Since the release of this blog post, Color.js was corrupted and reverted to its previous version of 1.4.0. Given the chance, I'll talk to you for far too long about why I love Flutter so much.

options - required.Lewis Cianci Follow I'm a passionate mobile-first developer, and I've been making apps with Flutter since it first released.

PrintNode.WebSocket is a constructor and takes three arguments: It returns true if your browser supports the WebSocket functionality and false otherwise, in which case you can fall back to the HTTP functionality. WebSocket Client Checking for Browser SupportĬall ().

Everything will be imported into a global object named PrintNode. 100% coverage of the PrintNode HTTP API.This is not yet at version 1.0.0 so there are some things missing:

WebSocket: any recent version of Chrome, Firefox and Safari IE10+ (it relies on the native window.WebSocket). If you need support for IE6+ any JSON shim (e.g. HTTP: any recent version of Chrome, Firefox and Safari IE8+ (it relies on JSON.parse() and JSON.stringify). Learn more about the PrintNode API at and PrintNode itself at. A tiny, zero dependency JavaScript client for the PrintNode WebSocket and HTTP APIs.