---
changelog:
  category: Release
  version: 0.1.0-beta.20
date: '2026-09-18T19:20:24Z'
seo:
  description: >-
    core, express, fastify, fetch, hono, node, server, tanstack-query: Add
    custom codecs support for fetch client and server adapters (d72a045) core,
    express…
title: v0.1.0-beta.20
type: changelog
---
core, express, fastify, fetch, hono, node, server, tanstack-query:
- Add custom codecs support for fetch client and server adapters ([d72a045](https://github.com/rest-rpc/rest-rpc/commit/d72a045))

core, express, fastify, fetch, hono, node, server, tanstack-query:
- Add server-first route declarations and implementations, typed clients derived from server implementations, and matching TanStack Query helpers. Add new `@rest-rpc/node` adapter for serving routes directly with Node HTTP `IncomingMessage` and `ServerResponse` handler. ([45d0fca](https://github.com/rest-rpc/rest-rpc/commit/45d0fca))

core, express, fastify, fetch, hono, node, server, tanstack-query:
- Remove flattened request keys convention and make each http declaration specify the request segments ([d72a045](https://github.com/rest-rpc/rest-rpc/commit/d72a045))

core, express, fastify, fetch, hono, node, server, tanstack-query:
- Remove support of returning undeclared headers through server handler. Remove set-cookie header helpers ([d72a045](https://github.com/rest-rpc/rest-rpc/commit/d72a045))

core, express, fastify, fetch, hono, node, server, tanstack-query:
- Remove the WebSocket and server-sent events abstractions, including their route builders, client and server helpers, adapter options, and related public types. ([d72a045](https://github.com/rest-rpc/rest-rpc/commit/d72a045))

core, express, fastify, fetch, hono, node, server, tanstack-query:
- Replace inferred and explicitly declared form array keys with bracket notation serialization across query parameters, URL-encoded forms, and multipart forms. ([d72a045](https://github.com/rest-rpc/rest-rpc/commit/d72a045))

core, server:
- Declare responses with `response(status, schema?, options?)`, where content type and typed headers are options and an omitted schema means no body. Store every response declaration as `{ body, contentType, headers? }`, normalizing an omitted body content type to `application/json` and `streamResponse()` to `application/x-ndjson`; no-body responses use `body: undefined`. Remove the custom body wrapper types, `isStandardSchema()`, and `customStreamResponse()`. Fetch clients parse and validate non-stream custom responses, with an optional `bodyParser` client setting for custom decoding. ([3cc08a5](https://github.com/rest-rpc/rest-rpc/commit/3cc08a5))

core, server:
- Remove `jsonQuery(schema)` support. This allowed to sent json via query string, but added unnecessary complexity to the client and server. ([3cc08a5](https://github.com/rest-rpc/rest-rpc/commit/3cc08a5))

core, server:
- Use `body(schema, { contentType })` and `input(schema, { contentType })` for every request body encoding, removing the form and multipart wrapper methods. An omitted body content type is normalized to `application/json`. Client calls select among multiple declared content types through the Fetch options argument. Server-first body calls always provide that option for non-JSON content types. ([3cc08a5](https://github.com/rest-rpc/rest-rpc/commit/3cc08a5))

core, server, tanstack-query:
- Add shorthand routes that omit explicit HTTP details and behave like procedures. Support shorthand declarations in server-first implementations, generated clients, OpenAPI documents, and TanStack Query helpers. Procedure handlers receive validated input under an `input` field while clients pass the input value directly. ([45d0fca](https://github.com/rest-rpc/rest-rpc/commit/45d0fca))

core, tanstack-query:
- Add HttpError to core package and convert all unknown responses to one ([eb811fd](https://github.com/rest-rpc/rest-rpc/commit/eb811fd))

core, tanstack-query:
- Remove the `strictStatusCodes` route factory option and make its behavior the default. HTTP clients now return only contract-declared responses and throw when a server returns an undeclared status. TanStack Query errors no longer include an undeclared `rawResponse` branch. ([b301886](https://github.com/rest-rpc/rest-rpc/commit/b301886))

core, tanstack-query:
- Replace `.fetch` and `.fetchResponse` with callable route leaves that return the response envelope. Server-first HTTP selectors now accept the path, grouped request, and Fetch API options in one call. ([45d0fca](https://github.com/rest-rpc/rest-rpc/commit/45d0fca))

core, tanstack-query:
- Replace conditional positional arguments on fetch client and tanstack query for request/options with simpler convention. To pass options when there is no request input pass undefined as first argument explictly ([45d0fca](https://github.com/rest-rpc/rest-rpc/commit/45d0fca))

core, tanstack-query:
- Replace the client response `declared` discriminator with status-based narrowing. Undeclared responses now preserve the untouched native `Response`, HTTP response declarations are limited to statuses from 100 through 599. ([45d0fca](https://github.com/rest-rpc/rest-rpc/commit/45d0fca))

express, fastify, fetch, hono, node, server:
- Use each framework's native error-handling flow for request and response validation failures. Replace the shared server error-handler API with exported validation error classes and adapter-specific hooks allowing for more native feeling error handling. ([45d0fca](https://github.com/rest-rpc/rest-rpc/commit/45d0fca))

fetch, server:
- Replace automatic 404 handling for non-matched route with a result type, giving more control for user on how to handle non-matched routes ([f1e7102](https://github.com/rest-rpc/rest-rpc/commit/f1e7102))