Linux pretty print json

How to Pretty Print JSON File in Linux Terminal

Last updated December 8, 2020 By Abhishek Prakash 2 Comments

JSON files are awesome because they store collection of data in a human-readable format. However, reading the JSON file can be a pain if the JSON file is minified.

Take this for an example:

A computer can easily read it. Even a human can still read it but if JSON file is properly formatted to display the content, it will be much easier. I mean JSON files are supposed to read like this after all:

You can use most text editor with some plugins to display it with proper formatting. However, if you are stuck to a terminal or if you want to do it in your shell script, things will be different.

If you got a minified file, let me show you how to pretty print the JSON file in Linux terminal.

Pretty print JSON with jq command in Linux

jq is a command line JSON processor. You can use it to slice, filter, map and transform structured data. I am not going in details about using jq command line tool here.

To use jq, you need to install it first. You can use your distribution’s package manager to install it. With universe repository enabled, you can install it on Ubuntu using the apt command:

Once you have it installed, use it in the following manner to pretty print JSON file on the display:

You may also tempt to use cat but I believe it one of the useless use of cat command.

Keep in mind that the above command will not impact the original JSON file. No changes will be written to it.

You probably already know how to redirect the command output to a file in Linux. You probably also know that you cannot redirect to the same file and the tee command is not guaranteed to work all the time.

If you want to modify the original JSON file with pretty print format, you can pipe the parsed output to a new file and then copy it to the original JSON file.

Bonus: Minify a JSON file with jq command

Let’s take a reverse stance and minify a well formatted JSON file. To minify a JSON file, you can use the compact option -c.

You can also use cat and redirection if you want:

Using Python to pretty print JSON file in Linux

It’s more likely that you have Python installed on your system. If that’s the case, you can use it pretty print the JSON file in the terminal:

I know there are other ways to parse JSON file and print it with proper format. You may explore them on your own but these two are sufficient to do the job which is to pretty print JSON file.

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How to read and print pretty JSON with PHP

Example-1: Print JSON without formatting

json_encode() function of PHP is used to parse any JSON data. Create a file named exp1.php with the following code to read a simple JSON data and print the output. Here, an associative array is declared to generate JSON data. No formatting is applied for JSON data in the code. So, JSON data will be printed in a single line in JSON format.

exp1.php

// Declare the array
$courses =array ( «Module-1» = > «HTML» , «Module-2» = > «JavaScript» , «Module-3» = > «CSS3» ,
«Module-4» = > «PHP» ) ;

// Print the array in a simple JSON format
echo json_encode ( $courses ) ;
? >

Output:

The following output will appear after executing the file from the browser.

Example-2: Print JSON using JSON_PRETTY_PRINT option and header() function

PHP has an option named ‘JSON_PRETTY_PRINT’ which is used with json_encode() function to print JSON data with proper alignment and particular format. Create a file named exp2.php with the following code. In the code, the same array of the previous example is used to see the use JSON_PRETTY_PRINT option. header() function is used here to inform the browser about the file content. No formatting will be applied without this function.

exp2.php

?php
// Declare the array
$courses =array ( «Module-1» = > «HTML» , «Module-2» = > «JavaScript» , «Module-3» = > «CSS3» ,
«Module-4» = > «PHP» ) ;

// Notify the browser about the type of the file using header function
header ( ‘Content-type: text/javascript’ ) ;

// Print the array in a simple JSON format
echo json_encode ( $courses , JSON_PRETTY_PRINT ) ;
? >

Output:

The following output will appear after executing the file from the browser. A specific font and alignment will be applied.

Example-3: Print JSON using JSON_PRETTY_PRINT option and » ;
>
? >

Output:

The following output will appear after executing the file from the browser. Here, each question and answer of the JSON data will be printed with blue color and bold format and, another part will be printed with red color.

Conclusion

How you can print formatted JSON data by using various PHP options are tried to show in this article. Hope, the reader will be able to apply the PHP to format JSON data and generate pretty JSON output after practicing the above examples properly.

About the author

Fahmida Yesmin

I am a trainer of web programming courses. I like to write article or tutorial on various IT topics. I have a YouTube channel where many types of tutorials based on Ubuntu, Windows, Word, Excel, WordPress, Magento, Laravel etc. are published: Tutorials4u Help.

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Linux pretty print json

Pretty-print JSON data into HTML to indent and colorize (written in TypeScript)

For dark mode, replace pretty-print-json.css with pretty-print-json.dark-mode.css in the
tag.

Install package for node:

Import into your application:

Or for older CommonJS/UMD environments:

Pass data into prettyPrintJson.toHtml() and display the results.

Name (key)	Type	Default	Description
indent	integer	3	Number of spaces for indentation.
linkUrls	boolean	true	Create anchor tags for URLs.
quoteKeys	boolean	false	Always double quote key names.

4) TypeScript Declarations

The TypeScript Declaration File file is pretty-print-json.d.ts in the dist folder.

The output of the prettyPrintJson.toHtml(thing: unknown, options?: FormatOptions) function is configured with a FormatOptions object:

Example TypeScript usage with explicit types:

5) Contributor Notes

To be a contributor, fork the project and run the commands npm install and npm test on your local clone. Make your edits and rerun the tests. Pull requests welcome.

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🦋 Pretty-print JSON data into HTML to indent and colorize (written in TypeScript)

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docker inspect -f json pretty print #110

Comments

gtseres commented Sep 22, 2017 •

This is a bug report This is a feature request I searched existing issues before opening this one

Expected behavior

When executing docker inspect -f=’<

>>’ for containers, networks, etc., the json object should be formatted just like in the case where we don’t use the -f option; that is, pretty-printed, e.g.:

Actual behavior

The JSON object is not pretty printed:

I could not find any option for that either in the available template functions of inspect , or in the inspect command help:

Steps to reproduce the behavior

Run docker inspect for an existing container or network, using the -f option:

Output of docker version :

Output of docker info :

Additional environment details (AWS, VirtualBox, physical, etc.)
Running in a Virtualbox Ubuntu 16.04.3 LTS relesae

The text was updated successfully, but these errors were encountered:

SimonHeimberg commented Dec 7, 2018

work around (any hint for myself): pipe the output to a json-pretty-printer

I like the current output on one line for docker ls commands (docker stack ls, docker container ls, docker container ps, . ).

mikzuit commented Mar 4, 2020

There is jq to which you can pipe your output. ej. like this below:

thaJeztah commented May 29, 2020

This was discussed at some point, and decided not to add in order to not overload the options for —format , and because there’s great tools, such as jq mentioned above that allow formatting, colorising, and more manipulation of JSON output.

Closing this for now, but feel free to continue the conversation

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Python JSON pretty print

JSON (JavaScript Object Notation) is a widely used format to store the data. It is used to exchange data between servers and software applications, i.e., web application, mobile application, etc. Python provides a built-in JSON module to perform JSON related tasks.

The Python object (i.e., list, dictionary, tuple) can be converted into JSON. We use the dumps() function from the JSON module to perform this conversion. Whenever the Python object is converted into a JSON, and if we print the converted JSON object, results will be displayed the same as the Python dictionary. The JSON pretty print refers to display the JSON object in a good format and presentable way.

This article explains the JSON pretty print concept with the help of examples.

The json.dump() function

As discussed previously, the json.dump() is a built-in Python function that converts the Python object into JSON format. Let’s convert a Python dictionary object into JSON format.

Output

The Python dictionary object is successfully converted to the JSON format.

The output seems like a Python dictionary. It is not in a good JSON format and presentable way. It is not prettified. The “indent” property is used inside the json.dumps() function to present the JSON data in a proper presentable format with space. Let’s use the indent property with the json.dumps() function. The “indent=1” adds the one space in JSON data.

Output

Now the output is prettified, and JSON data is presented in the proper format.

As we keep increasing the number of indents, the spaces will increase in the data.

#importing json module
import json

#creating a Python dictionary object
my_dict = < "name" : "David" , "age" : 30 , "email" : "[email protected]" , "coutry" : "USA" >
#converting to JSON format
result_json = json. dumps ( my_dict , indent = 5 )
#printing the converted json object
print ( result_json )

Output

Output

Python pretty print JSON file

Now, let’s try to open a JSON file and display it in pretty print format. The json.loads() function parse the JSON data.

Output

Conclusion

JSON is a widely used data format to store data and exchange data between servers and software applications. Python has a built-in JSON module to perform JSON related tasks. The JSON pretty print displays the JSON output in a well-formed and presentable way. This article explains the Python JSON pretty print with explains.

About the author

Kamran Sattar Awaisi

I am a software engineer and a research scholar. I like to write article and make tutorial on various IT topics including Python, Cloud Computing, Fog Computing and Deep Learning. I love to use Linux based operating systems.

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