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How to use dictionary in Jinja 2

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by gayathrimohan dot icon Updated: Nov 28, 2023

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Jinja2 is a templating engine for Python developed by Armin Ronacher. The development of Jinja2 focuses on simplicity and extensibility. It has evolved through several releases, introducing new features and improvements.  

 

The template syntax gets inspiration from Django and Python. It provides a familiar and expressive way to define templates. One notable aspect of Jinja2 is its use in web frameworks such as Flask and Django. Flask relies on Jinja2 to render HTML templates. It enables developers to integrate dynamic content into their web applications.  

  • Syntax: Jinja2 uses double curly braces {{}} for variable substitution.   
  • Filters: Jinja2 provides filters to change variables in the template.   
  • Conditions and Loops: Jinja2 supports control structures.   
  • Template Inheritance: Jinja2 allows template inheritance. It will let you define a base template and extend or override blocks in child templates.  
  • Macros: You can define reusable components called macros.   
  • Context Variables: When rendering a template, you can pass a context. It is a dictionary of variables. This context can include dictionaries that the template accesses and manipulates.  
  • Comments: Jinja2 supports comments using {# #}. This is helpful for documenting your templates, including how you're interacting with dictionaries.  

 

Here are examples of types of data to store in a Jinja2 dictionary:  

  • Text/String  
  • Numbers  
  • Lists  
  • Dictionaries (Nested Data)  
  • Boolean Values  
  • Images (as file paths or URLs)  
  • Structured Data (Custom Objects)  
  • Conditional Data  
  • Formatted Text  
  • Dates and Times  

 

Jinja2 is a templating engine in Python. It helps in web development frameworks like Flask and Django. While it's not a standalone dictionary, it works with Python dictionaries. This renders dynamic content in templates.  

 

Here are two main ways to use it:  

  • Rendering Dynamic Content in Templates  
  • Research Tool  
  • Automated Scripts  

 

In conclusion, the Jinja2 dictionary serves as a dynamic template engine. It empowers developers to create flexible and reusable templates. It facilitates efficient content generation and manipulation.  

Fig: Preview of the output that you will get on running this code from your IDE.

Code

In this solution we are using jinja2 library in Python.

Jinja Template convert string into dictionary

Lines of Code : 34dotLicense : Strong Copyleft (CC BY-SA 4.0)

import json
from flask import Flask, render_template, redirect, url_for, request, g

app = Flask(__name__,
            static_url_path='',
            static_folder='static')

@app.template_filter('to_dict')
def to_dict(my_string):
    return json.loads(my_string)

@app.route('/')
def home():
    return render_template("app_jinja.j2", my_dict_string='{"a": 1, "b": 3}')

if __name__ == "__main__":
    app.run(debug=True, port=8000, host="0.0.0.0")


<pre>
{% set my_dict = my_dict_string | to_dict %}
{{ my_dict }}

{% for key,value in my_dict.items() %}
{{ key}} - {{ value }}
{% endfor %}

{'a': 1, 'b': 3}


a - 1

b - 3

Instructions

Follow the steps carefully to get the output easily.


  1. Download and Install the PyCharm Community Edition on your computer.
  2. Open the terminal and install the required libraries with the following commands.
  3. Create a new Python file on your IDE.
  4. Copy the snippet using the 'copy' button and paste it into your python file.
  5. Remove lines of code from no:20 to 33 and then save the code.
  6. Run the current file to generate the output.


I hope you found this useful.


I found this code snippet by searching for 'How to use dictionary in Jinja 2' in Kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. PyCharm Community Edition 2022.3.1
  2. The solution is created in Python 3.11.1 Version
  3. jinja 3.1.2 Version


Using this solution, we can able to use dictionary in Jinja 2 in python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to use dictionary in Jinja 2 in python.

Dependent Library

jinjaby pallets

Python doticonstar image 9285 doticonVersion:3.1.2doticon
License: Permissive (BSD-3-Clause)

A very fast and expressive template engine.

Support
    Quality
      Security
        License
          Reuse

            jinjaby pallets

            Python doticon star image 9285 doticonVersion:3.1.2doticon License: Permissive (BSD-3-Clause)

            A very fast and expressive template engine.
            Support
              Quality
                Security
                  License
                    Reuse

                      You can search for any dependent library on Kandi like 'jinja'.

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                      FAQs 

                       

                      1. What is the Jinja template engine, and how does it work?  

                      Jinja is a templating engine for Python. It allows you to embed dynamic content within templates. It helps to separate the logic from the presentation. Jinja templates contain placeholders, which you can replace with current values during rendering.  

                       

                      2. How can I use dict and yield in a Jinja2 dictionary?  

                      In Jinja2, you can use a dictionary to pass variables to templates.  

                      For example:   

                      my_dict = {'key1': 'value1', 'key2': 'value2'}   

                      rendered_template = template.render(my_dict=my_dict)   

                      Using yield is not used in Jinja2 dictionaries. It is more common in Python generators for lazy evaluation.  

                       

                      3. How does Flask leverage the Jinja2 template engine?  

                      Flask, a web framework for Python, integrates Jinja2 as its default template engine. Flask uses Jinja2 to render HTML templates. It allows you to pass variables from your Python code to the templates for dynamic content.  

                       

                      4. What are some of the other popular template engines available for web development?  

                      Other popular template engines for web development include:  

                      • Django Templates: Used in the Django web framework.  
                      • Mako: A fast and lightweight template engine.  
                      • Mustache: A logic-less template syntax that is used in various languages.  
                      • Handlebars: A superset of Mustache with more features.  

                       

                      5. How do I set up my template variables to render in a Jinja2 dictionary?  

                      You can pass them as arguments when rendering the template to set up template variables in Jinja.  

                      For example:   

                      template_vars = {'variable1': 'value1', 'variable2': 'value2'}   

                      rendered_template = template.render(**template_vars)   

                      In the template, you can then access these variables using double curly braces. Those variables are like {{variable1}} and {{variable2}}.  

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