REST API Example
This example shows how to implement a REST API using NestJS and Prisma Client. It uses a SQLite database file with some initial dummy data which you can find at ./prisma/dev.db
. The example was bootstrapped using the NestJS CLI command nest new rest-nestjs
.
Getting started
1. Download example and install dependencies
Download this example:
curl https://codeload.github.com/prisma/prisma-examples/tar.gz/latest | tar -xz --strip=2 prisma-examples-latest/typescript/rest-nestjs
Install npm dependencies:
cd rest-nestjs
npm install
Alternative: Clone the entire repo
Clone this repository:
git clone git@github.com:prisma/prisma-examples.git --depth=1
Install npm dependencies:
cd prisma-examples/typescript/rest-nestjs
npm install
2. Create and seed the database
Run the following command to create your SQLite database file. This also creates the User
and Post
tables that are defined in prisma/schema.prisma
:
npx prisma migrate dev --name init
Now, seed the database with the sample data in prisma/seed.ts
by running the following command:
npx prisma db seed --preview-feature
2. Start the REST API server
npm run dev
The server is now running on http://localhost:3000
. You can now the API requests, e.g. http://localhost:3000/feed
.
Using the REST API
You can access the REST API of the server using the following endpoints:
GET
/post/:id
: Fetch a single post by itsid
/feed
: Fetch all published posts/filterPosts?searchString={searchString}
: Filter posts bytitle
orcontent
POST
/post
: Create a new post- Body:
title: String
(required): The title of the postcontent: String
(optional): The content of the postauthorEmail: String
(required): The email of the user that creates the post
- Body:
/user
: Create a new user- Body:
email: String
(required): The email address of the username: String
(optional): The name of the user
- Body:
PUT
/publish/:id
: Publish a post by itsid
DELETE
/post/:id
: Delete a post by itsid
Evolving the app
Evolving the application typically requires two steps:
- Migrate your database using Prisma Migrate
- Update your application code
For the following example scenario, assume you want to add a "profile" feature to the app where users can create a profile and write a short bio about themselves.
1. Migrate your database using Prisma Migrate
The first step is to add a new table, e.g. called Profile
, to the database. You can do this by adding a new model to your Prisma schema file file and then running a migration afterwards:
// schema.prisma
model Post {
id Int @default(autoincrement()) @id
title String
content String?
published Boolean @default(false)
author User? @relation(fields: [authorId], references: [id])
authorId Int
}
model User {
id Int @default(autoincrement()) @id
name String?
email String @unique
posts Post[]
+ profile Profile?
}
+model Profile {
+ id Int @default(autoincrement()) @id
+ bio String?
+ userId Int @unique
+ user User @relation(fields: [userId], references: [id])
+}
Once you've updated your data model, you can execute the changes against your database with the following command:
npx prisma migrate dev
2. Update your application code
You can now use your PrismaClient
instance to perform operations against the new Profile
table. Here are some examples:
Create a new profile for an existing user
const profile = await prisma.profile.create({
data: {
bio: "Hello World",
user: {
connect: { email: "alice@prisma.io" },
},
},
});
Create a new user with a new profile
const user = await prisma.user.create({
data: {
email: "john@prisma.io",
name: "John",
profile: {
create: {
bio: "Hello World",
},
},
},
});
Update the profile of an existing user
const userWithUpdatedProfile = await prisma.user.update({
where: { email: "alice@prisma.io" },
data: {
profile: {
update: {
bio: "Hello Friends",
},
},
},
});
Switch to another database (e.g. PostgreSQL, MySQL, SQL Server)
If you want to try this example with another database than SQLite, you can adjust the the database connection in prisma/schema.prisma
by reconfiguring the datasource
block.
Learn more about the different connection configurations in the docs.
Expand for an overview of example configurations with different databases
PostgreSQL
For PostgreSQL, the connection URL has the following structure:
datasource db {
provider = "postgresql"
url = "postgresql://USER:PASSWORD@HOST:PORT/DATABASE?schema=SCHEMA"
}
Here is an example connection string with a local PostgreSQL database:
datasource db {
provider = "postgresql"
url = "postgresql://janedoe:mypassword@localhost:5432/notesapi?schema=public"
}
MySQL
For MySQL, the connection URL has the following structure:
datasource db {
provider = "mysql"
url = "mysql://USER:PASSWORD@HOST:PORT/DATABASE"
}
Here is an example connection string with a local MySQL database:
datasource db {
provider = "mysql"
url = "mysql://janedoe:mypassword@localhost:3306/notesapi"
}
Microsoft SQL Server (Preview)
Here is an example connection string with a local Microsoft SQL Server database:
datasource db {
provider = "sqlserver"
url = "sqlserver://localhost:1433;initial catalog=sample;user=sa;password=mypassword;"
}
Because SQL Server is currently in Preview, you need to specify the previewFeatures
on your generator
block:
generator client {
provider = "prisma-client-js"
previewFeatures = ["microsoftSqlServer"]
}
Next steps
- Check out the Prisma docs
- Share your feedback in the
prisma2
channel on the Prisma Slack - Create issues and ask questions on GitHub
- Watch our biweekly "What's new in Prisma" livestreams on Youtube