Leash Documentation

Everything you need to deploy apps and connect integrations.

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Quickstart

Get your code online in 60 seconds

Access control

Public, private, or team — gateway-enforced, no code

App env vars

Declare in .env.example, read with your language’s standard env-var API

Deploy guides

Per-framework deploy recipes

Databases

Managed Postgres or bring your own

Building with Leash

The tiered model — when to install the SDK and what each tier adds

Local dev

The canonical local-dev flow — SDK, API key, dev-auth handler

Integrations

Call third-party APIs without managing OAuth

User identity

Read the calling user server-side with leash.auth.user()

Dynamic env vars

Rotate keys without redeploys, audit every read

SDK API

Per-namespace surface reference for the Leash client

CLI

Installation, auth, commands, secrets

Custom OAuth

Bring your own OAuth client

Custom MCP

Error handling

LeashError codes and recovery patterns

API keys

Create, list, and revoke API keys

Plugins

Claude Code and Codex plugins

Troubleshooting

Common pitfalls

Glossary

One-line definitions for terms used across the docs