Durable Streams – Kafka-style semantics for client streaming over HTTP
Hey, I'm a co-founder at ElectricSQL. Durable Streams is the delivery protocol underneath our Postgres sync engine—we've been refining it in production for 18 months. The core idea: streams get their own URL and use opaque, monotonic offsets. Clients persist the last offset they processed and resume with "give me everything after X." No server-side session state, CDN-cacheable, plain HTTP. We kept seeing teams reinvent this for AI token streaming and real-time apps, so we're standardizing it as a standalone protocol. The repo has a reference Node.js server and TypeScript client. Would love…
In plain words
Durable Streams is an HTTP-based protocol for reliable client streaming with Kafka-style semantics, refined in production for 18 months as part of ElectricSQL's Postgres sync engine. Clients use opaque monotonic offsets to resume streams without server-side session state, making it suitable for AI token streaming and real-time applications. The protocol works over plain HTTP and is CDN-cacheable. A reference Node.js server and TypeScript client are included, along with conformance tests for validating implementations in other languages.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey, I'm a co-founder at ElectricSQL. Durable Streams is the delivery protocol underneath our Postgres sync engine—we've been refining it in production for 18 months. The core idea: streams get their own URL and use opaque, monotonic offsets. Clients persist the last offset they processed and resume with "give me everything after X." No server-side session state, CDN-cacheable, plain HTTP. We kept seeing teams reinvent this for AI token streaming and real-time apps, so we're standardizing it as a standalone protocol. The repo has a reference Node.js server and TypeScript client. Would love to see implementations in other languages—there's a conformance test suite to validate compatibility. Happy to dig into the design tradeoffs—why plain HTTP over WebSockets, etc.
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