---
title: Flask with SQLAlchemy and Marshmallow - Best Software Development Team Extension Partner for Nordics
description: Learn how to use Flask with SQLAlchemy and Marshmallow to build robust web applications with efficient database integration and ease
---

[Blog - Trusted Team Extension Partner For Europe & USA](https://www.craftsmensoftware.com/blog)

# [Flask with SQLAlchemy and Marshmallow - Best Software Development Team Extension Partner for Nordics](https://www.craftsmensoftware.com/blog/flask-with-sqlalchemy-and-marshmallow)

 Written by [Md. Nahidur Rahman](https://www.craftsmensoftware.com/blog/author/md-nahidur-rahman) | 20/04/2024

Using this guide master the combination of Flask with SQLAlchemy and Marshmallow to build and manage scalable web applications with ease.

In the article we will build a simple REST API using **Flask** **SQLAlchemy** and **Marshmallow**. We will be building a note taking application where these two API endpoints */note/* and*/note/\<id\>/* will be available.

We will be able to create new note or get all the notes by doing a **POST** or a **GET** request to */note/* api endpoint. Not only that we will be able to get the details of the note or update the note or delete the note with a **GET** or a **PATCH** or a **DELETE** request to */note/\<id\>/* api endpoint.

First of all, we will give a brief descriptions of the libraries that we will be using in this article.

[**Flask**](https://palletsprojects.com/p/flask/) is a lightweight WSGI web application framework in Python. It is designed to make getting started very quickly and very easily.

[**marshmallow**](https://marshmallow.readthedocs.io/en/stable/) is an ORM/ODM/framework-agnostic library for converting complex datatypes, such as objects, to and from native Python datatypes.

[**Flask-Marshmallow**](https://flask-marshmallow.readthedocs.io/en/latest/) is a thin integration layer for Flask and marshmallow that adds additional features to marshmallow.

[**SQLAlchemy**](https://www.sqlalchemy.org/) is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL.

[**Flask-SQLAlchemy**](https://flask-sqlalchemy.palletsprojects.com/) is an extension for Flask that adds support for SQLAlchemy to your application. It aims to simplify using SQLAlchemy with Flask.

[**marshmallow-sqlalchemy**](https://marshmallow-sqlalchemy.readthedocs.io/en/latest/index.html) An SQLAlchemy integration with the marshmallow (de)serialization library.

We will be using **pipenv** as our dependency manager. We are assuming that pipenv is already installed in your system.

Follow the steps bellow and at the end you will have a simple note application running on[http://localhost:5000/.](http://localhost:5000/)

 

**Step 1: Setup Project Environment**

```
 
```

 

**Step 2: Install Flask and Other Dependencies**

Run the following commands to install all the dependencies including Flask.

pipenv install flaskpipenv install flask-marshmallowpipenv install flask-sqlalchemypipenv install marshmallow-sqlalchemy

After running those commands marshmallow and SQLAlchemy will be installed internally as dependency.

 

**Step 3: Create *app.py* File**

 

**Step 4: Add This Code to *app.py File***

```
 
```

**Step 5: Start pipenv Shell**

 

**Step 6: Run Flask Server**

 

**Step 7: Go to the Browser**

Start your favorite browser and go to the http://localhost:5000/ url and you will see *Hello, World!* printed.

 

**Step 8: Integrate SQLAlchemy & Marshmallow**

Add the following imports into the ***app.py*** file.

import osfrom flask\_sqlalchemy import SQLAlchemyfrom flask\_marshmallow import Marshmallow

And add the following code after the creation of Flask app instance.

 

**Step 9: Create Model**

Declare the model like following.

```
 
```

**Step 10: Create Schema**

Generate marshmallow schema from the model.

```
 
```

 

**Step 11: Build Out API Actions**

 

**Step 12: Setup Database**

Enter in python shell

```
 
```

 

**Step 13: Test APIs**

We can use the tool[**Postman**](https://www.postman.com/) to test our APIs. But before that please ensure your development server is up and running using this command ***python app.py*** from **Step 6**.

The complete code of this article can be found in[this repository](https://github.com/nahidsaikat/Flask-with-SQLAlchemy-and-Marshmallow).

[View full post](https://www.craftsmensoftware.com/blog/flask-with-sqlalchemy-and-marshmallow)

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