Clojure + Ring

Clojure + Ring for functional APIs.

BackendModerate

Stack Components

LanguageClojure 1.12

FrameworkRing 1

DBnext.jdbc

DBPostgreSQL 16

Why

Immutable, REPL-driven, simple handlers. Node.js, Go, and Python are the top 3 backend languages (Stack Overflow 2024).

Go's goroutines handle 100k+ concurrent connections per process; Node's event loop excels at I/O-bound workloads.

When

Use for Clojure web apps. Avoid for non-Lisp teams.

How

1. lein new ring app 2. Define handlers 3. Configure routes 4. lein ring server 5. Add environment configuration — cp .env.example .env && edit values 6. Run tests — npm test or pnpm test to verify setup 7. Deploy — git push to trigger CI/CD or manual deploy

Example

(defn users [req] {:status 200 :body users}) // Clojure + Ring — usage example import { ClojureRing } from "clojure-ring"; const result = await clojurering({ input: "data" }); console.log(result);

Common Problems

⚠Middleware — use comp for composition
⚠REPL — use nrepl for hot reload
⚠Configuration drift between environments — use infrastructure-as-code (Terraform/Pulumi) to keep dev/staging/prod identical

Best Practices

✓Use Compojure for routing
✓Leverage Spec for validation
✓Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit

FAQ

What is Clojure + Ring and what projects is it for?

Clojure + Ring for functional APIs. It pairs layered technologies for end-to-end type safety and out-of-the-box deploys, fitting everything from MVPs to production SaaS.

How do I spin up a working demo with Clojure + Ring in 10 minutes?

Two steps: (1) lein new ring app; (2) Define handlers. Get the local dev server running, then wire one real data source to verify the end-to-end loop.

What is the most common pitfall with Clojure + Ring and how do I avoid it?

The most common pitfall is: Middleware — use comp for composition. Avoid it by adding the matching checklist to your PR template and running type-check + lint + unit tests in CI — three gates before merge.

What are the best practices for Clojure + Ring?

Best practices for Clojure + Ring include: Use Compojure for routing; Leverage Spec for validation; Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit. The first one — "Use Compojure for routing" — should be set up at project init to avoid costly rework later.

When should I NOT choose Clojure + Ring?

Pick something else in three cases: (1) the team has zero experience with the core framework and the deadline is tight (learning-curve risk); (2) it's a pure content/marketing site (Astro is lighter); (3) you need very high throughput (>10k RPS) or strict-consistency microservices (Go/Rust). Clojure + Ring shines for mid-to-high complexity full-stack and API work — don't over-engineer simple static pages with it.