Deploy and Host PostgreSQL REST API (PostgREST) on Railway

What is PostgreSQL REST API (PostgREST)?

PostgREST is a lightweight server that automatically exposes a PostgreSQL database as a REST API. Database tables, views, and functions become HTTP endpoints, with access control handled entirely by PostgreSQL roles and permissions instead of application code.

About Hosting PostgreSQL REST API (PostgREST)

Hosting PostgREST involves running the PostgREST server alongside a PostgreSQL database and configuring the connection using environment variables. Instead of writing a traditional backend, the database schema and permissions define how the API behaves.

On Railway, PostgREST runs as a containerized service and connects to a managed PostgreSQL instance over Railway’s private network. This makes it easy to deploy a production-ready REST API with minimal setup while keeping database access centralized and controlled.

Common Use Cases

• Exposing PostgreSQL data to frontend applications
• Internal APIs for backend or microservice communication
• Rapid prototyping without building a custom backend
• Read-only APIs using PostgreSQL permissions
• Data access layers built on PostgreSQL views

Dependencies for PostgreSQL REST API (PostgREST) Hosting

• PostgreSQL database
• PostgREST server

Deployment Dependencies

• Railway PostgreSQL template
• PostgREST Docker image
• PostgreSQL client access (for managing roles and permissions)

Security Model

PostgREST does not implement its own authorization logic.
Instead, PostgreSQL itself is the security boundary.

Only database objects that the configured role can access will be exposed by the API.

Default Configuration

This template uses the postgres role by default so the API works immediately after deployment. This is useful for testing and initial setup, but it is not recommended for production environments.

Creating a Restricted API Role (Recommended)

For production use, create a dedicated read-only role for the API.

1. Create the API role

CREATE ROLE api_user NOLOGIN;

2. Grant database and schema access

GRANT CONNECT ON DATABASE railway TO api_user;
GRANT USAGE ON SCHEMA public TO api_user;

3. Grant read access to tables

GRANT SELECT ON ALL TABLES IN SCHEMA public TO api_user;

To ensure future tables are accessible:

ALTER DEFAULT PRIVILEGES
IN SCHEMA public
GRANT SELECT ON TABLES TO api_user;

4. Reload PostgREST schema cache

NOTIFY pgrst, 'reload schema';

Or restart the PostgREST service.

5. Update PostgREST configuration

Set the following environment variable in the PostgREST service:

PGRST_DB_ANON_ROLE=api_user

After this change, only tables and views explicitly granted to api_user will be exposed by the API.

Security Best Practices

Do not expose the postgres role publicly

Prefer views over tables for public APIs

Use separate schemas for internal and public data

Remove the public domain if the API is internal-only

Rotate credentials if they were exposed during testing

Why Deploy PostgreSQL REST API (PostgREST) on Railway?

Railway provides a single platform to deploy and manage infrastructure without manual configuration. Services can scale vertically or horizontally while remaining easy to operate.

Deploying PostgREST on Railway allows you to expose PostgreSQL data as an API with minimal operational overhead. Databases, backend services, and supporting infrastructure can all live in one place, making it easier to build and maintain full-stack applications.