postaljs/postal.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2836 stars · 187 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

postal is a TypeScript-first pub/sub message bus for JavaScript with AMQP-style topic wildcards, channel-scoped messaging, request/response RPC, and wire taps. It includes a transport system for bridging messages across iframes, web workers, browser tabs, and Node.js child processes.

Use cases

• decouple components with publish-subscribe messaging in JavaScript
• send messages between browser tabs
• communicate between an iframe and its parent page
• publish and subscribe with wildcard topic matching
• implement request/response messaging over an event bus
• bridge pub/sub between web workers and the main thread
• add typed event-driven messaging to a TypeScript app

When to choose

• you need a lightweight, zero-dependency message bus with full TypeScript inference
• you need cross-context messaging (iframes, workers, tabs, child processes) with a consistent API
• you want AMQP-style wildcard subscriptions and channel isolation in the browser or Node.js

When to avoid

• you need durable, persistent message queuing across processes or machines — use a real message broker like RabbitMQ or Kafka
• you are on postal v2 and cannot afford the breaking changes in the v3 rewrite
• your app is simple enough that native EventTarget or EventEmitter suffices

Facets

library · maturity active

message-queue middleware rpc websocket web-development frontend developer-tools browser cross-platform pub-sub message-bus event-bus typescript amqp-wildcards iframes web-workers broadcast-channel zero-dependencies javascript nodejs web-server

Member repositories

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markdown · JSON · MCP: product_card(name="postaljs/postal.js")