Create A RESTful API Using the Flask Framework

Luckily, some great Python web frameworks abstract away the complexities of processing HTTP requests and returning responses. You know that the response was successful because of the 200 OK status code. The response also has a Content-Type header set to application/json. A REST API exposes a set of public URLs that client applications use to access the resources of a web service.

build simple restful api with python and flask part 1

Django REST framework takes an existing Django model and converts it to JSON for a REST API. It does this with model serializers. A model serializer tells Django REST framework how to convert a model instance into JSON and what data to include. The fields name, capital, and area store data about a specific country somewhere in the world.

Building a simple REST API with NodeJS and Express.

The next step is to add an endpoint to retrieve a specific programming language resource from the datastore. The details endpoint has an interpolated variable in the endpoint string called programming_language_id. This variable allows you to query for a specific item in your datastore. The id refers to the index in the list related to a specific instance of a programming language resource.

  • We have learned to create Flask REST API from scratch and its maintenance easily and securely.
  • This line define function that will be executed if we access route.
  • You’ve added a couple of things to incorporate Connexion into the server.
  • This command creates a new folder in your current directory called countryapi.
  • In this article we’ll setting our environment and create endpoint that will show “Hello World”.

HTTP status codes come in handy when working with REST APIs as you’ll often need to perform different logic based on the results of the request. REST stands for representational state transfer and is a software architecture style that defines a pattern for client and server communications over a network. REST provides a set of constraints How to become a cloud engineer for software architecture to promote performance, scalability, simplicity, and reliability in the system. In this tutorial, you saw how relatively easy it is to create a comprehensive REST API with Python. When Delete is clicked, the Controller calls the Model to make a request to the DELETE /api/people/ URL endpoint.

Step 1 – Setup the Python Project with Pipenv

Here we imported create_app() function from src/app and call the function by passing our environment name(in this case “development”). Don’t forget that create_app() functions return a flask object, in this case we name the object app. Now, in order to consume these APIs, also known as endpoints, we need a client to place requests from. Typically, the client is supposed to be another application or machine that is going to request the server for resources. However, it is not always possible to develop an entire application to test your APIs. For that purpose, we have another tool, Postman, that will help us test our endpoints once we are done with the development. I would advise you to download and install Postmanon your machine before continuing the next part of the article.

  • From the outside world, Fauna behaves like an API; every query is a single HTTP request.
  • Each of the endpoints above performs a different action based on the HTTP method.
  • This alone has been very useful to me in my work building API systems supporting single page web applications.
  • In this light, a waiter’s job description fits perfectly into how an API works.

We can also change the quantity of any item ordered if we so choose. When I started writing this post, I though it would end up being relatively straightforward. As I added the requirement that the code should not just be a toy example, some of the inherent difficulties with building a robust API on top of any database became apparent. That is, the client sends the request data to the server as a JSON text.

Pick Your Data Interchange Format

Flask is a popular micro framework for building web applications. Since it is a micro-framework, it is very easy to use and lacks most of the advanced functionality which is found in a full-fledged framework. The code creates the in_memory_datastore ASP NET Razor Pages vs MVC: Benefits and Code Comparisons nested dictionary with entries for three programming language. Each programming language dictionary has keys for its name, the approximate year it was published, and its contributions to modern programming languages.

The endpoint of the URL will return the data from the CSV file with a status of 200. Also, when you want to add a new user to the file, you can use the post method and provide the details as parameters. Are you intrigued by how REST APIs use HTTP requests to accept data from clients and return data accurately?

Python Modules

Flask provides a solid backbone for your applications while leaving many design choices up to you. Flask’s main job is to handle HTTP requests and route them to the appropriate function in the application. This response includes the 422 Unprocessable Entity status code. This status code indicates that there weren’t any issues with the request, but the data was invalid. If the user sends data with the request, then the API should validate the data and inform the user of any errors. There’s always a chance that requests to your REST API could fail.

The PUT and DELETE requests would look similar as well, with only the –request flag changing. The two basic tasks of a waiter are taking an order and delivering it to the cook and then taking the prepared food from the kitchen to the customer.

Bootstrapping a Flask Application

The first error-handler intercepts any endpoint that fails with a 404 status code and ensures that the error is returned as a JSON dict. Since the APIs are in JSON, we create an Object method .json() to return a JSON book object. The server will add this information to the Database and then forget the action. That is next time I use a GET request to retrieve the Book; the server will not have any memory of the previous POST method action. Here when we send the server a request, unlike an API which responds with data, REST API responds withresources. In addition, Flask also documented the usage of MethodView to allow developers to write their own restful APIs.

  • # Create some test data for our catalog in the form of a list of dictionaries.
  • Django plugins are Django applications that are packaged up and distributed and that anyone can use.
  • Now, the server is not only limited to a database but can also be another machine that reads and writes data from a flat file or any other data store.
  • So, we need to create more routes, which will add more functionality to our API.
  • I assumed that you have python 2.7 and pip installed on your computer.

Keep in mind that these methods can be used in tandem as well. Say we order an item and want the waiter or waitress to confirm that the item was added. The POST method would take care of the ordering part while the GET method will facilitate the confirmation. As the name The role of a Java developer suggests, the DELETE method is used to remove a resource. In the restaurant, an example could be removing an item from the menu. This example will be used throughout the article, and in the hands-on section, we’ll build a full-fledged restaurant API using Flask.

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