Source maps – mara.dev

A one-kilobyte router with nested routes, lazy segments and no opinion about your view layer.

Structural diffing for objects and arrays, with patches you can apply, invert and store.

Bundle analysis that tells you which import cost you the weight, not just which file is large.

Request mocking at the network layer, so the same handlers serve tests and local development.

Runtime validation that infers its static types, so a schema is written exactly once.