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Flask
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Flask vs Jinja2: What are the differences?

What is Flask? a microframework for Python based on Werkzeug, Jinja 2 and good intentions. Flask is intended for getting started very quickly and was developed with best intentions in mind.

What is Jinja2? Full featured template engine for Python. Jinja2 is a full featured template engine for Python. It has full unicode support, an optional integrated sandboxed execution environment, widely used and BSD licensed.

Flask can be classified as a tool in the "Microframeworks (Backend)" category, while Jinja2 is grouped under "Templating Languages & Extensions".

"Lightweight" is the top reason why over 261 developers like Flask, while over 4 developers mention "It is simple to use" as the leading cause for choosing Jinja2.

Flask and Jinja2 are both open source tools. It seems that Flask with 44.8K GitHub stars and 12.6K forks on GitHub has more adoption than Jinja2 with 6.25K GitHub stars and 1.21K GitHub forks.

According to the StackShare community, Flask has a broader approval, being mentioned in 502 company stacks & 509 developers stacks; compared to Jinja2, which is listed in 20 company stacks and 23 developer stacks.

What is Flask?

Flask is intended for getting started very quickly and was developed with best intentions in mind.

What is Jinja2?

It is a full featured template engine for Python. It has full unicode support, an optional integrated sandboxed execution environment, widely used and BSD licensed.
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    What are some alternatives to Flask and Jinja2?
    Django
    Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.
    Tornado
    By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.
    ExpressJS
    Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.
    Node.js
    Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
    React
    Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it's easy to try it out on a small feature in an existing project.
    See all alternatives
    Decisions about Flask and Jinja2
    Pierre Chapuis
    Pierre Chapuis
    at Pierre Chapuis · | 5 upvotes · 49.2K views
    atChilliChilli
    Gunicorn
    Gunicorn
    Python
    Python
    SQLAlchemy
    SQLAlchemy
    Hug
    Hug
    Flask
    Flask

    Unlike our frontend, we chose Flask, a microframework, for our backend. We use it with Python 3 and Gunicorn.

    One of the reasons was that I have significant experience with this framework. However, it also was a rather straightforward choice given that our backend almost only serves REST APIs, and that most of the work is talking to the database with SQLAlchemy .

    We could have gone with something like Hug but it is kind of early. We might revisit that decision for new services later on.

    See more
    Praveen Mooli
    Praveen Mooli
    Technical Leader at Taylor and Francis · | 11 upvotes · 162.5K views
    MongoDB Atlas
    MongoDB Atlas
    Amazon S3
    Amazon S3
    Amazon DynamoDB
    Amazon DynamoDB
    Amazon RDS
    Amazon RDS
    Serverless
    Serverless
    Docker
    Docker
    Terraform
    Terraform
    Travis CI
    Travis CI
    GitHub
    GitHub
    RxJS
    RxJS
    Angular 2
    Angular 2
    AWS Lambda
    AWS Lambda
    Amazon SQS
    Amazon SQS
    Amazon SNS
    Amazon SNS
    Amazon Kinesis Firehose
    Amazon Kinesis Firehose
    Amazon Kinesis
    Amazon Kinesis
    Flask
    Flask
    Python
    Python
    ExpressJS
    ExpressJS
    Node.js
    Node.js
    Spring Boot
    Spring Boot
    Java
    Java
    #Data
    #Devops
    #Webapps
    #Eventsourcingframework
    #Microservices
    #Backend

    We are in the process of building a modern content platform to deliver our content through various channels. We decided to go with Microservices architecture as we wanted scale. Microservice architecture style is an approach to developing an application as a suite of small independently deployable services built around specific business capabilities. You can gain modularity, extensive parallelism and cost-effective scaling by deploying services across many distributed servers. Microservices modularity facilitates independent updates/deployments, and helps to avoid single point of failure, which can help prevent large-scale outages. We also decided to use Event Driven Architecture pattern which is a popular distributed asynchronous architecture pattern used to produce highly scalable applications. The event-driven architecture is made up of highly decoupled, single-purpose event processing components that asynchronously receive and process events.

    To build our #Backend capabilities we decided to use the following: 1. #Microservices - Java with Spring Boot , Node.js with ExpressJS and Python with Flask 2. #Eventsourcingframework - Amazon Kinesis , Amazon Kinesis Firehose , Amazon SNS , Amazon SQS, AWS Lambda 3. #Data - Amazon RDS , Amazon DynamoDB , Amazon S3 , MongoDB Atlas

    To build #Webapps we decided to use Angular 2 with RxJS

    #Devops - GitHub , Travis CI , Terraform , Docker , Serverless

    See more
    Interest over time
    Reviews of Flask and Jinja2
    Avatar of mjhea0
    Software Engineer at TestDriven Labs
    Review ofFlaskFlask

    Flask is a light, yet powerful Python web framework perfect for quickly building smaller web applications. It's a "micro-framework" that's easy to learn and simple to use, so it's perfect for those new to web development as well as those looking to rapidly develop a web application.

    How developers use Flask and Jinja2
    Avatar of Jack Littleton
    Jack Littleton uses FlaskFlask

    I use Flask for times when I need to create a REST API that interfaces with other Python code, or there is no specific reason why I'd want to use Node.JS. I prefer Flask because of its small learning curve, allowing me to get started coding as quickly as possible

    Avatar of Cloudify
    Cloudify uses FlaskFlask

    This lightweight web framework enables quick REST API development while enabling easy clustering, and the usage of multiple worker processes required to scale the REST API service to meet high volume requirements.

    Avatar of Seungkwon Park
    Seungkwon Park uses Jinja2Jinja2

    django와 flask에서 html을 다룰때 jinja를 통해 다룹니다. 이것으로 템플릿을 나누어 header, footer를 별도로 관리하며 | 를 사용해 함수를 만들어 데이터를 수정하기도 합니다.

    특히 summernote를 이용과 해쉬태그 만들기를 하면서 jinja에 대한 이해가 높아졌습니다.

    Avatar of Sail Tactics
    Sail Tactics uses FlaskFlask

    Service to query NOAA weather forecasts data and service to build tidal current forecast maps using AWS EC2 and Geoserver

    Avatar of OnlineCity
    OnlineCity uses FlaskFlask

    Flask drives our APIs, both the Website APIs and the majority of the REST Messaging APIs

    Avatar of papaver
    papaver uses FlaskFlask

    used flask for a few personal projects. enjoyed its simplicity and ease of use.

    How much does Flask cost?
    How much does Jinja2 cost?
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