Creating First REST API with FastAPI

FastAPI :
FastAPI is modern Web Framework . It is used for building API and is very easy to learn .

Features of FastAPI :

• High Performance than many Web Frameworks, faster than Node.js, etc .
• Easy to Develop API’s
• Production Ready
• Well Documentation to learn code fast
• Swagger UI to form API Documentation
• Avoid Redundancy of Code
• Easy Testing
• Support for GraphQL, Background Fetching, Dependency Injection

CREATING REST API USING FastAPI :

• Install Python 3 and pip/pip3 according to your Operating System
• Now, install fastapi using pip or pip3 :

     pip install fastapi
  

• Install the uvicorn which is the Asynchronous Gateway Interface for your Server using :

    pip install uvicorn
  

• Now create a main.py file and import fastapi, also create a server

    from fastapi import FastAPI
    app = FastAPI()
  

• Now, let’s add the code for sample get request as shown below :

   @app.get("/")
   def read_root():
      return {"Hello": "World"}
  

• Hence, the main.py file will look like :

  from fastapi import FastAPI
  app = FastAPI()
  
  @app.get("/")
  def first_example():
      """
         GFG Example First Fast API Example
      """
     return {"GFG Example": "FastAPI"}
• Now, start the server using

  uvicorn main:app --reload
  

• Now open the browser and open http://localhost:8000/docs or http://127.0.0.1:8000/docs
  You will be able to see the Swagger UI Home page as below :
  
• Expand the “First Example” :
  
• Now try to Execute the API, you will get the success status with 200 code .
  The Response will be {“GFG Example”: “FastAPI”} as shown below :
  

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