What is Jsonnet?

Introduction to a domain specific configuration language that helps to define JSON data
30 October 2017   2100

What is Jsonnet?

Jsonnet is a domain specific configuration language that helps you define JSON data. Jsonnet lets you compute fragments of JSON within the structure, bringing the same benefit to structured data that templating languages bring to plain text. The example below illustrates a few features -- referring to another part of the structure, overriding object fields, and string operations.

Use Jsonnet to organize your JSON data, or to help your users organize the data they send to you. It is easy to integrate Jsonnet's library or commandline interpreter into existing systems that take JSON or YAML. Some example situations are application configuration (files in etc), build systems, package definitions, configuration management systems, and cloud deployment agents.

Code examples

// Jsonnet Example
    person1: {
        name: "Alice",
        welcome: "Hello " + self.name + "!",
    person2: self.person1 { name: "Bob" },

Goes to:

   "person1": {
      "name": "Alice",
      "welcome": "Hello Alice!"
   "person2": {
      "name": "Bob",
      "welcome": "Hello Bob!"


If you are interested, visit:

  • Website
  • GitHub
  • Docs

Node.js v12.0.0 to be Rolled Out

It has giant list of updates, improvements and changes
24 April 2019   135

The release of Node.js 12.0.0, a platform for executing network applications in JavaScript, is available. Node.js 12.0 refers to branches with a long period of support, but this status will be assigned only in October, after stabilization. Updates for LTS branches are issued for 3 years. Support for the last LTS branch of Node.js 10.0 will last until April 2021, and the year before last LTS-branch 8.0 until January 2020. Support for the intermediate branch Node.js 11.0 will be discontinued in June 2019. The lifetime of the LTS branch 6.0 will end on April 30.

These are some of the large list of updates and new staff:

  • V8 engine was updated to version 7.4 with support for asynchronous stack traces, increasing await performance, parsing JavaScript and calls when the actual and declared number of arguments does not match;
  • TLS 1.3 is now supported in the tls module and TLS 1.0 / 1.1 is shutdown by default;
  • Enhancing protection and checks on the size of allocated memory in the Buffer class;

Get more info at official website.