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A quick intro to JSON {}

JSON, which stands for JavaScript Object Notation, is the most popular and widely accepted data exchange format, and it was originally specified by Douglas Crockford.


  • JSON is an easy-to-use, purely text-based format that is lightweight and human-readable.

  • It is platform and language-independent, and almost all front-line languages and frameworks provide inbuilt support for JSON.

  • The official MIME type for JSON text is application/json.

  • JSON files typically have the file name extension .json.


The syntax rules for JSON are as follows:

  • Data is organized in name/value pairs.
  • Data is separated by commas.
  • Objects are enclosed in curly braces.
  • Arrays are enclosed in square brackets.

JSON Array example

JSON Object example

Parse the data with JSON.parse(), and the data becomes a JavaScript object.

Parse JSON string in JS

When sending data to a web server, the data has to be a string. Convert a JavaScript object into a string with JSON.stringify().

JSON Object to simple string

Common Problems

  • Trailing Comma - you are not allowed to add a trailing comma.
  • Missing Commas - Since trailing commas are not allowed, it is easy to forget to append one before adding a new value.
  • Comments - JSON does not allow comments as it is a data-interchange format.

Check out this video by quick @beaucarnes via freeCodeCamp for a quick introduction to JSON

You can visualize your JSON data instantly into graphs with this JSON Crack tool. Thanks for the read!

- Aadarsh K

This post is licensed under CC BY 4.0 by the author.