Implementing Fine-grained Authorization in NestJS Application
Integrate fine-grained authorization into your NestJS application to enable secure collaboration, where users can create, edit, and manage content based on their specific roles and permissions.
This guide shows you how to add fine-grained authorization to a NestJS application using Permit.io. You will set up a policy for creating posts and comments, register users, assign them roles (like Author, Moderator, or Reader), and enforce permissions directly in your app's endpoints and middleware.
By the end, you will have a working example where only authorized users can access protected endpoints, and you will understand how to integrate Permit.io into your own NestJS applications.
Prerequisites
- NestJS application
- Docker (for running the PDP server)
- Node.js (for installing and running the Permit CLI)
- Permit.io account (Follow this guide to create an account)
Policy Configuration
Before integrating Permit.io with your NestJS application, you need to configure a policy. If you already have a policy configured, you can skip this section and proceed directly to the integration guide.
Configure Policy in Permit
Installing the Permit CLI
First, install the Permit CLI. The Permit CLI is a command-line tool that allows you to create policies, run the PDP server, and perform other tasks. To install the CLI, run the following command in your terminal:
npm install -g @permitio/cli
Once the installation is complete, run permit
to confirm the installation.
Authenticating the CLI
To use the CLI, authenticate it with your Permit account. Run:
permit login
This command opens a browser window and prompts you to log in with your Permit account. After logging in, the CLI is authenticated and ready to use. This also logs you into the default environment (a project can have multiple environments).
You can change the environment by running permit env select
and then selecting the environment you want to use.