I built a blazing-fast OpenAPI mock server in Rust — starts in milliseconds, zero config, dynamic fake data

Hey HN, Most OpenAPI mock servers I've worked with fall into one of three buckets: they're slow to...

mercoledì 15 luglio 2026 New tab

656 words~3 min read

Hey HN,

Most OpenAPI mock servers I've worked with fall into one of three buckets: they're slow to boot (JVM warmup, Node module resolution), they need Docker just to run, or they return the same hardcoded stub on every request. None of that is great when you just want to unblock frontend work or sketch out an integration against a spec that's still moving.

So I built mock-cli — a single static binary written in Rust that reads any OpenAPI 3 spec (YAML or JSON) and serves schema-aware, dynamic fake data over HTTP. No runtime, no container, no config file.

Repo: https://github.com/wanghao12345/mock-cli

npm: npm install -g @mock-cli/server

I built a blazing-fast OpenAPI mock server in Rust — starts in milliseconds, zero config, dynamic fake data

I built a blazing-fast OpenAPI mock server in Rust — starts in milliseconds, zero config, dynamic fake data

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