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Pylint JSON report to HTML

Project description


A pylint JSON report file to HTML: pylint is used to generate a JSON report, and this tool will transform this report into an HTML document:

usage: pylint-json2html [-h] [-o FILENAME] [-e OUTPUT_ENCODING]
                        [-t FILENAME] [-f FORMAT] [FILENAME]

Transform Pylint JSON report to HTML

positional arguments:
FILENAME              Pylint JSON report input file (or stdin)

optional arguments:
-h, --help          show this help message and exit
                    Pylint HTML report output file (or stdout)
-e ENCODING, --encoding ENCODING
                    Encoding used to write output file (if not stdout);
                    default to utf-8
-t FILENAME, --template FILENAME
                    Jinja2 custom template to generate report
-f FORMAT, --input-format FORMAT
                    Pylint JSON Report input type (json or jsonextended)


Since its 1.7 version, Pylint does not provide an HTML output format. The release notes say that:

It was lately a second class citizen in Pylint, being mostly neglected. Since we now have the JSON reporter, it can be used as a basis for building more prettier HTML reports than what Pylint can currently generate. This is part of the effort of removing cruft from Pylint, by removing less used features.

And I agree with that statements. Few people use the HTML reports, and pylint is getting old. Its core features are complex and they require a lot of times and efforts - and I am thankful for that software to exist in the first place!

So here it is: a plugin to fulfill my own needs. I share it as open-source because why not?


To install this tool, use pip:

(venv) $ pip install pylint-json2html

You can always download the sources from the github repository, and use the file to install or develop, but I would not recommend that unless you plan to contribute to this small project of mine.


My favorite way of using pylint and pylint-json2html is this one:

(venv) $ pylint my_package | pylint-json2html -o pylint.html

Provided that you configure your Pylint config file with:


But you can generate first a JSON file, then use pylint-json2html to read it:

(venv) $ pylint your_package > pylint.json
(venv) $ pylint-json2html -o pylint.html pylint.json

You can also redirect pylint-json2html's stdout:

(venv) $ pylint-json2html pylint.json > pylint.html

You can specify the output encoding used to write to your file. Note that you can't do that with stdout (you will have to configure your environment's locale if you want to control that):

(venv) $ pylint-json2html -o pylint.html -e utf-8 pylint.json

This is especially usefull when your locale is something like cp1252 or latin1, and you want to make sure your output file is properly written as utf-8 (as it should be when working with Python file).

Extended Report

Actually, I lied about my favorite way, it is this one:

(venv) $ pylint my_package | pylint-json2html -f jsonextended -o pylint.html

With this Pylint configuration:



The pylint_json2html is a Pylint plugin that adds a new output format: jsonextended. By default, the json format contains only a list of messages, and this new format contains also metrics, such the number of analysed statements, or the list of dependencies.

The configuration above can be tested using the command line instead:

(venv) $ pylint --load-plugins=pylint_json2html \
                --output-format=jsonextended your_package > pylint.json

Then, you will be able to use the JSON extended report to generate an HTML report:

(venv) $ pylint-json2html -f jsonextended -o pylint.html pylint.json

And voilà!

Custom Template

This plugin uses a Jinja2 template to generate the HTML output, but you may need your own template. For that purpose, you can use the option -t/--template, like this:

(venv) $ pylint-json2html -f jsonextended -t custom.tpl -o pylint.html pylint.json


In your template you have access to a report object:

  • report.score: score given by pylint, available only with jsonextended format
  • report.previous_score: previous score given by pylint, available only with jsonextended format
  • report.modules: a list of 2-value tuple: (module, messages)

The module object:

  • name of the module
  • module.path: path to the module's file

The messages value is a list of dict, each with the following keys:

  • line
  • column
  • type
  • symbol
  • message-id
  • obj
  • message


In your template you have access to a metrics dict with the following keys: types, symbols, modules, paths. Each of them contains a dict.


The default template contains that header:

<meta charset="utf-8">

So if you want to use a different output encoding, make sure that:

  1. you can actually encode the characters from pylint's output with that encoding
  2. and also that you use your own custom template to change that meta tag, otherwise that might not look very good in a browser

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