Deploy and Host Deno KV on Railway

Deno KV is a key-value database with atomic transactions, secondary indexes and watch streams, built into the Deno runtime. This runs the standalone denokv server, so the same Deno.openKv() code that works locally works against a database you host — outside Deno Deploy.

About Hosting Deno KV

A single service storing its data in SQLite on a persistent volume, protected by a generated access token. Deno clients connect over HTTP by passing the deployment URL to Deno.openKv().

Common Use Cases

Deno apps outside Deno Deploy: Keep Deno.openKv() in the code while hosting the application anywhere, instead of being tied to the platform that provides KV.
Shared state between services: Several Deno processes reading and writing the same KV store, with atomic operations to keep them honest.
Sessions, feature flags and rate limits: Small, hot data that wants transactions but not a relational schema.

Dependencies for Deno KV Hosting

Deployment Dependencies

The official denokv server image
A Railway volume for the SQLite file
Deno 1.38 or newer on the client side

Implementation Details

Connect by giving the URL to Deno.openKv("https://") and exporting DENO_KV_ACCESS_TOKEN in the client environment with the same value as the service variable. The Deno runtime reads that variable itself — there is no separate authentication call.

DENO_KV_SQLITE_PATH puts the database on the volume. That one file is the entire dataset and the only thing worth backing up.

The access token is the only protection on a public domain. There are no users, roles or per-key permissions — whoever holds it can read and write everything. Rotate it by editing the variable and redeploying, and expect connected clients to fail until they are updated.

The standalone server is single-writer by design. It is a good fit for a service or a small fleet sharing state, not for a high-write workload spread across many instances.

Why Deploy Deno KV on Railway?

Railway is a singular platform to deploy your infrastructure stack. Railway will host your infrastructure so you don't have to deal with configuration, while allowing you to vertically and horizontally scale it.

By deploying Deno KV on Railway, you are one step closer to supporting a complete full-stack application with minimal burden. Host your servers, databases, AI agents, and more on Railway.

Resources: very small — a Rust binary over SQLite, a few tens of megabytes at idle and a few dollars a month. Cost tracks the volume rather than the process.