This article contains two different ways to get an instant API:

• An API based on a DbContext, it will generate the routes it needs given a database class.
• An API based on a JSON file.

A proof-of-concept library that generates Minimal API endpoints for an Entity Framework context.

For a given Entity Framework context, MyContext

public class MyContext : DbContext { public MyContext(DbContextOptions<MyContext> options) : base(options) {} public DbSet<Contact> Contacts => Set<Contact>(); public DbSet<Address> Addresses => Set<Address>(); }

We can generate all of the standard CRUD API endpoints using this syntax in Program.cs

var builder = WebApplication.CreateBuilder(args); builder.Services.AddSqlite<MyContext>("Data Source=contacts.db"); var app = builder.Build(); app.MapInstantAPIs<MyContext>(); app.Run();

Now we can navigate to /api/Contacts and see all of the Contacts in the database. We can filter for a specific Contact by navigating to /api/Contacts/1 to get just the first contact returned. We can also post to /api/Contacts and add a new Contact to the database. Since there are multiple DbSet, you can make the same calls to /api/Addresses.

Check out Fritz giving a demo, showing the advantage of InstantAPIs on YouTube: https://youtu.be/vCSWXAOEpBo

An API will be generated based on JSON file, for now it needs to be named mock.json.

A typical content in mock.json looks like so:

{ "products" : [{ "id": 1, "name": "pizza" }, { "id": 2, "name": "pineapple pizza" }, { "id": 3, "name": "meat pizza" }], "customers" : [{ "id": 1, "name": "customer1" }] }

The above JSON will create the following routes:

To use this, do the following:

1. Create a new minimal API, if you don't already have one:

   dotnet new web -o DemoApi -f net6.0 cd DemoApi 

2. Add the NuGet package for Fritz.InstantAPIs:

   dotnet add package Fritz.InstantAPIs --prerelease

3. In Program.cs, add the following namespace:

   using Mock;

4. Create a file mock.json and give it for example the following content:

   { "products" : [{ "id": 1, "name": "pizza" }] }

5. Now add the following code for the routes to be created:

   app.UseJsonRoutes();

Here's an example program:

using Mock; var builder = WebApplication.CreateBuilder(args); var app = builder.Build(); app.MapGet("/", () => "Hello World!"); app.UseJsonRoutes(); app.Run();

Support for:

• query parameters
• PUT

This project is covered by a code of conduct that all contributors must abide by. Contributions are welcome and encouraged..