diff --git a/packages/next/build/entries.ts b/packages/next/build/entries.ts
index bf743e8d03db2..01a3f9e5c2268 100644
--- a/packages/next/build/entries.ts
+++ b/packages/next/build/entries.ts
@@ -164,15 +164,6 @@ export function getEdgeServerEntry(opts: {
     return `next-middleware-loader?${stringify(loaderParams)}!`
   }
 
-  if (opts.page.startsWith('/api/')) {
-    const loaderParams: MiddlewareLoaderOptions = {
-      absolutePagePath: opts.absolutePagePath,
-      page: opts.page,
-    }
-
-    return `next-edge-function-loader?${stringify(loaderParams)}!`
-  }
-
   const loaderParams: MiddlewareSSRLoaderQuery = {
     absolute500Path: opts.pages['/500'] || '',
     absoluteAppPath: opts.pages['/_app'],
@@ -418,9 +409,7 @@ export function runDependingOnPageType<T>(params: {
   if (params.page === MIDDLEWARE_FILE) {
     return [params.onEdgeServer()]
   } else if (params.page.match(API_ROUTE)) {
-    return params.pageRuntime === 'edge'
-      ? [params.onEdgeServer()]
-      : [params.onServer()]
+    return [params.onServer()]
   } else if (params.page === '/_document') {
     return [params.onServer()]
   } else if (
diff --git a/packages/next/build/index.ts b/packages/next/build/index.ts
index 2ef17d8528015..2a2179e519b09 100644
--- a/packages/next/build/index.ts
+++ b/packages/next/build/index.ts
@@ -94,6 +94,7 @@ import {
   getUnresolvedModuleFromError,
   copyTracedFiles,
   isReservedPage,
+  isCustomErrorPage,
   isServerComponentPage,
 } from './utils'
 import getBaseWebpackConfig from './webpack-config'
@@ -1254,7 +1255,10 @@ export default async function build(
                 isHybridAmp,
                 ssgPageRoutes,
                 initialRevalidateSeconds: false,
-                runtime: pageRuntime,
+                runtime:
+                  !isReservedPage(page) && !isCustomErrorPage(page)
+                    ? pageRuntime
+                    : undefined,
                 pageDuration: undefined,
                 ssgPageDurations: undefined,
               })
diff --git a/packages/next/build/webpack-config.ts b/packages/next/build/webpack-config.ts
index bbae4c5040099..be2aa7ee50e8f 100644
--- a/packages/next/build/webpack-config.ts
+++ b/packages/next/build/webpack-config.ts
@@ -1232,7 +1232,6 @@ export default async function getBaseWebpackConfig(
         'next-flight-client-entry-loader',
         'noop-loader',
         'next-middleware-loader',
-        'next-edge-function-loader',
         'next-middleware-ssr-loader',
         'next-middleware-wasm-loader',
         'next-app-loader',
diff --git a/packages/next/build/webpack/loaders/get-module-build-info.ts b/packages/next/build/webpack/loaders/get-module-build-info.ts
index 4f8a1b45ca5a9..36e4380778c87 100644
--- a/packages/next/build/webpack/loaders/get-module-build-info.ts
+++ b/packages/next/build/webpack/loaders/get-module-build-info.ts
@@ -7,7 +7,6 @@ import { webpack5 } from 'next/dist/compiled/webpack/webpack'
 export function getModuleBuildInfo(webpackModule: webpack5.Module) {
   return webpackModule.buildInfo as {
     nextEdgeMiddleware?: EdgeMiddlewareMeta
-    nextEdgeApiFunction?: EdgeMiddlewareMeta
     nextEdgeSSR?: EdgeSSRMeta
     nextUsedEnvVars?: Set<string>
     nextWasmMiddlewareBinding?: WasmBinding
diff --git a/packages/next/build/webpack/loaders/next-edge-function-loader.ts b/packages/next/build/webpack/loaders/next-edge-function-loader.ts
deleted file mode 100644
index e66d06f270da2..0000000000000
--- a/packages/next/build/webpack/loaders/next-edge-function-loader.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-import { getModuleBuildInfo } from './get-module-build-info'
-import { stringifyRequest } from '../stringify-request'
-
-export type EdgeFunctionLoaderOptions = {
-  absolutePagePath: string
-  page: string
-}
-
-export default function middlewareLoader(this: any) {
-  const { absolutePagePath, page }: EdgeFunctionLoaderOptions =
-    this.getOptions()
-  const stringifiedPagePath = stringifyRequest(this, absolutePagePath)
-  const buildInfo = getModuleBuildInfo(this._module)
-  buildInfo.nextEdgeApiFunction = {
-    page: page || '/',
-  }
-
-  return `
-        import { adapter } from 'next/dist/server/web/adapter'
-
-        // The condition is true when the "process" module is provided
-        if (process !== global.process) {
-          // prefer local process but global.process has correct "env"
-          process.env = global.process.env;
-          global.process = process;
-        }
-
-        var mod = require(${stringifiedPagePath})
-        var handler = mod.middleware || mod.default;
-
-        if (typeof handler !== 'function') {
-          throw new Error('The Edge Function "pages${page}" must export a \`default\` function');
-        }
-
-        export default function (opts) {
-          return adapter({
-              ...opts,
-              page: ${JSON.stringify(page)},
-              handler,
-          })
-        }
-    `
-}
diff --git a/packages/next/build/webpack/plugins/middleware-plugin.ts b/packages/next/build/webpack/plugins/middleware-plugin.ts
index 8f837d2ea6053..1b3d58ab74e5f 100644
--- a/packages/next/build/webpack/plugins/middleware-plugin.ts
+++ b/packages/next/build/webpack/plugins/middleware-plugin.ts
@@ -14,26 +14,24 @@ import {
   NEXT_CLIENT_SSR_ENTRY_SUFFIX,
 } from '../../../shared/lib/constants'
 
-interface EdgeFunctionDefinition {
-  env: string[]
-  files: string[]
-  name: string
-  page: string
-  regexp: string
-  wasm?: WasmBinding[]
-}
-
 export interface MiddlewareManifest {
   version: 1
   sortedMiddleware: string[]
   clientInfo: [location: string, isSSR: boolean][]
-  middleware: { [page: string]: EdgeFunctionDefinition }
-  functions: { [page: string]: EdgeFunctionDefinition }
+  middleware: {
+    [page: string]: {
+      env: string[]
+      files: string[]
+      name: string
+      page: string
+      regexp: string
+      wasm?: WasmBinding[]
+    }
+  }
 }
 
 interface EntryMetadata {
   edgeMiddleware?: EdgeMiddlewareMeta
-  edgeApiFunction?: EdgeMiddlewareMeta
   edgeSSR?: EdgeSSRMeta
   env: Set<string>
   wasmBindings: Set<WasmBinding>
@@ -44,7 +42,6 @@ const middlewareManifest: MiddlewareManifest = {
   sortedMiddleware: [],
   clientInfo: [],
   middleware: {},
-  functions: {},
   version: 1,
 }
 
@@ -313,8 +310,6 @@ function getExtractMetadata(params: {
           entryMetadata.edgeSSR = buildInfo.nextEdgeSSR
         } else if (buildInfo?.nextEdgeMiddleware) {
           entryMetadata.edgeMiddleware = buildInfo.nextEdgeMiddleware
-        } else if (buildInfo?.nextEdgeApiFunction) {
-          entryMetadata.edgeApiFunction = buildInfo.nextEdgeApiFunction
         }
 
         /**
@@ -391,19 +386,16 @@ function getCreateAssets(params: {
 
       // There should always be metadata for the entrypoint.
       const metadata = metadataByEntry.get(entrypoint.name)
-      const page =
-        metadata?.edgeMiddleware?.page ||
-        metadata?.edgeSSR?.page ||
-        metadata?.edgeApiFunction?.page
+      const page = metadata?.edgeMiddleware?.page || metadata?.edgeSSR?.page
       if (!page) {
         continue
       }
 
       const { namedRegex } = getNamedMiddlewareRegex(page, {
-        catchAll: !metadata.edgeSSR && !metadata.edgeApiFunction,
+        catchAll: !metadata.edgeSSR,
       })
 
-      const edgeFunctionDefinition: EdgeFunctionDefinition = {
+      middlewareManifest.middleware[page] = {
         env: Array.from(metadata.env),
         files: getEntryFiles(entrypoint.getFiles(), metadata),
         name: entrypoint.name,
@@ -411,12 +403,6 @@ function getCreateAssets(params: {
         regexp: namedRegex,
         wasm: Array.from(metadata.wasmBindings),
       }
-
-      if (metadata.edgeApiFunction /* || metadata.edgeSSR */) {
-        middlewareManifest.functions[page] = edgeFunctionDefinition
-      } else {
-        middlewareManifest.middleware[page] = edgeFunctionDefinition
-      }
     }
 
     middlewareManifest.sortedMiddleware = getSortedRoutes(
diff --git a/packages/next/server/body-streams.ts b/packages/next/server/body-streams.ts
index 19a3c20c004b9..38b14e54e7d19 100644
--- a/packages/next/server/body-streams.ts
+++ b/packages/next/server/body-streams.ts
@@ -19,7 +19,7 @@ function requestToBodyStream(request: IncomingMessage): BodyStream {
   return transform.readable as unknown as ReadableStream<Uint8Array>
 }
 
-export function bodyStreamToNodeStream(bodyStream: BodyStream): Readable {
+function bodyStreamToNodeStream(bodyStream: BodyStream): Readable {
   const reader = bodyStream.getReader()
   return Readable.from(
     (async function* () {
diff --git a/packages/next/server/dev/next-dev-server.ts b/packages/next/server/dev/next-dev-server.ts
index 290f481edf50c..0b733bd28fb3c 100644
--- a/packages/next/server/dev/next-dev-server.ts
+++ b/packages/next/server/dev/next-dev-server.ts
@@ -354,9 +354,7 @@ export default class DevServer extends Server {
             onClient: () => {},
             onServer: () => {},
             onEdgeServer: () => {
-              if (!pageName.startsWith('/api/')) {
-                routedMiddleware.push(pageName)
-              }
+              routedMiddleware.push(pageName)
               ssrMiddleware.add(pageName)
             },
           })
diff --git a/packages/next/server/next-server.ts b/packages/next/server/next-server.ts
index 6b72fb474cfe8..969bf533211c1 100644
--- a/packages/next/server/next-server.ts
+++ b/packages/next/server/next-server.ts
@@ -72,9 +72,9 @@ import { getCustomRoute } from './server-route-utils'
 import { urlQueryToSearchParams } from '../shared/lib/router/utils/querystring'
 import ResponseCache from '../server/response-cache'
 import { removeTrailingSlash } from '../shared/lib/router/utils/remove-trailing-slash'
-import { getNextPathnameInfo } from '../shared/lib/router/utils/get-next-pathname-info'
+import { clonableBodyForRequest } from './body-streams'
 import { getMiddlewareRegex } from '../shared/lib/router/utils/route-regex'
-import { bodyStreamToNodeStream, clonableBodyForRequest } from './body-streams'
+import { getNextPathnameInfo } from '../shared/lib/router/utils/get-next-pathname-info'
 
 export * from './base-server'
 
@@ -540,19 +540,6 @@ export default class NextNodeServer extends BaseServer {
     page: string,
     builtPagePath: string
   ): Promise<boolean> {
-    const handledAsEdgeFunction = await this.runEdgeFunctionApiEndpoint({
-      req,
-      res,
-      query,
-      params,
-      page,
-      builtPagePath,
-    })
-
-    if (handledAsEdgeFunction) {
-      return true
-    }
-
     const pageModule = await require(builtPagePath)
     query = { ...query, ...params }
 
@@ -1044,15 +1031,11 @@ export default class NextNodeServer extends BaseServer {
   }
 
   /**
-   * Get information for the edge function located in the provided page
-   * folder. If the edge function info can't be found it will throw
+   * Get information for the middleware located in the provided page
+   * folder. If the middleware info can't be found it will throw
    * an error.
    */
-  protected getEdgeFunctionInfo(params: {
-    page: string
-    /** Whether we should look for a middleware or not */
-    middleware: boolean
-  }) {
+  protected getMiddlewareInfo(page: string) {
     const manifest: MiddlewareManifest = require(join(
       this.serverDistDir,
       MIDDLEWARE_MANIFEST
@@ -1061,14 +1044,12 @@ export default class NextNodeServer extends BaseServer {
     let foundPage: string
 
     try {
-      foundPage = denormalizePagePath(normalizePagePath(params.page))
+      foundPage = denormalizePagePath(normalizePagePath(page))
     } catch (err) {
-      throw pageNotFoundError(params.page)
+      throw pageNotFoundError(page)
     }
 
-    let pageInfo = params.middleware
-      ? manifest.middleware[foundPage]
-      : manifest.functions[foundPage]
+    let pageInfo = manifest.middleware[foundPage]
     if (!pageInfo) {
       throw pageNotFoundError(foundPage)
     }
@@ -1094,10 +1075,7 @@ export default class NextNodeServer extends BaseServer {
     _isSSR?: boolean
   ): Promise<boolean> {
     try {
-      return (
-        this.getEdgeFunctionInfo({ page: pathname, middleware: true }).paths
-          .length > 0
-      )
+      return this.getMiddlewareInfo(pathname).paths.length > 0
     } catch (_) {}
 
     return false
@@ -1164,10 +1142,7 @@ export default class NextNodeServer extends BaseServer {
         }
 
         await this.ensureMiddleware(middleware.page, middleware.ssr)
-        const middlewareInfo = this.getEdgeFunctionInfo({
-          page: middleware.page,
-          middleware: true,
-        })
+        const middlewareInfo = this.getMiddlewareInfo(middleware.page)
 
         result = await run({
           name: middlewareInfo.name,
@@ -1436,80 +1411,4 @@ export default class NextNodeServer extends BaseServer {
       this.warnIfQueryParametersWereDeleted = () => {}
     }
   }
-
-  private async runEdgeFunctionApiEndpoint(params: {
-    req: NodeNextRequest
-    res: NodeNextResponse
-    query: ParsedUrlQuery
-    params: Params | false
-    page: string
-    builtPagePath: string
-  }): Promise<boolean> {
-    let middlewareInfo: ReturnType<typeof this.getEdgeFunctionInfo> | undefined
-
-    try {
-      middlewareInfo = this.getEdgeFunctionInfo({
-        page: params.page,
-        middleware: false,
-      })
-    } catch {
-      return false
-    }
-
-    // For middleware to "fetch" we must always provide an absolute URL
-    const url = getRequestMeta(params.req, '__NEXT_INIT_URL')!
-    if (!url.startsWith('http')) {
-      throw new Error(
-        'To use middleware you must provide a `hostname` and `port` to the Next.js Server'
-      )
-    }
-
-    const result = await run({
-      name: middlewareInfo.name,
-      paths: middlewareInfo.paths,
-      env: middlewareInfo.env,
-      wasm: middlewareInfo.wasm,
-      request: {
-        headers: params.req.headers,
-        method: params.req.method,
-        nextConfig: {
-          basePath: this.nextConfig.basePath,
-          i18n: this.nextConfig.i18n,
-          trailingSlash: this.nextConfig.trailingSlash,
-        },
-        url,
-        page: {
-          name: params.page,
-          ...(params.params && { params: params.params }),
-        },
-        // TODO(gal): complete body
-        // body: originalBody?.cloneBodyStream(),
-      },
-      useCache: !this.nextConfig.experimental.runtime,
-      onWarning: (_warning: Error) => {
-        // if (params.onWarning) {
-        //   warning.message += ` "./${middlewareInfo.name}"`
-        //   params.onWarning(warning)
-        // }
-      },
-    })
-
-    params.res.statusCode = result.response.status
-    params.res.statusMessage = result.response.statusText
-
-    result.response.headers.forEach((value, key) => {
-      params.res.appendHeader(key, value)
-    })
-
-    if (result.response.body) {
-      // TODO(gal): not sure that we always need to stream
-      bodyStreamToNodeStream(result.response.body).pipe(
-        params.res.originalResponse
-      )
-    } else {
-      params.res.originalResponse.end()
-    }
-
-    return true
-  }
 }
diff --git a/test/integration/react-streaming-and-server-components/switchable-runtime/pages/api/hello.js b/test/integration/react-streaming-and-server-components/switchable-runtime/pages/api/hello.js
deleted file mode 100644
index c8e368a7530a0..0000000000000
--- a/test/integration/react-streaming-and-server-components/switchable-runtime/pages/api/hello.js
+++ /dev/null
@@ -1,7 +0,0 @@
-export default (req) => {
-  return new Response(`Hello from ${req.url}`)
-}
-
-export const config = {
-  runtime: 'edge',
-}
diff --git a/test/integration/react-streaming-and-server-components/switchable-runtime/pages/api/node.js b/test/integration/react-streaming-and-server-components/switchable-runtime/pages/api/node.js
deleted file mode 100644
index 5587ef8457afc..0000000000000
--- a/test/integration/react-streaming-and-server-components/switchable-runtime/pages/api/node.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default (req, res) => {
-  res.send('Hello, world')
-}
diff --git a/test/integration/react-streaming-and-server-components/test/switchable-runtime.test.js b/test/integration/react-streaming-and-server-components/test/switchable-runtime.test.js
index bb5ad381e84d4..0a6cbade04325 100644
--- a/test/integration/react-streaming-and-server-components/test/switchable-runtime.test.js
+++ b/test/integration/react-streaming-and-server-components/test/switchable-runtime.test.js
@@ -12,7 +12,6 @@ import {
   renderViaHTTP,
   waitFor,
 } from 'next-test-utils'
-import { readJson } from 'fs-extra'
 
 const appDir = join(__dirname, '../switchable-runtime')
 
@@ -175,31 +174,6 @@ describe('Switchable runtime (prod)', () => {
     })
   })
 
-  it('should build /api/hello as an api route with edge runtime', async () => {
-    const response = await fetchViaHTTP(context.appPort, '/api/hello')
-    const text = await response.text()
-    expect(text).toMatch(/Hello from .+\/api\/hello/)
-
-    const manifest = await readJson(
-      join(context.appDir, '.next/server/middleware-manifest.json')
-    )
-    expect(manifest).toMatchObject({
-      functions: {
-        '/api/hello': {
-          env: [],
-          files: [
-            'server/edge-runtime-webpack.js',
-            'server/pages/api/hello.js',
-          ],
-          name: 'pages/api/hello',
-          page: '/api/hello',
-          regexp: '^/api/hello$',
-          wasm: [],
-        },
-      },
-    })
-  })
-
   it('should display correct tree view with page types in terminal', async () => {
     const stdoutLines = splitLines(context.stdout).filter((line) =>
       /^[┌├└/]/.test(line)
@@ -207,8 +181,6 @@ describe('Switchable runtime (prod)', () => {
     const expectedOutputLines = splitLines(`
   ┌   /_app
   ├ ○ /404
-  ├ ℇ /api/hello
-  ├ λ /api/node
   ├ ℇ /edge
   ├ ℇ /edge-rsc
   ├ ○ /node
@@ -220,16 +192,12 @@ describe('Switchable runtime (prod)', () => {
   ├ λ /node-ssr
   └ ○ /static
   `)
-
-    const mappedOutputLines = expectedOutputLines.map((_line, index) => {
-      /** @type {string} */
-      const str = stdoutLines[index]
-      const beginningOfPath = str.indexOf('/')
-      const endOfPath = str.indexOf(' ', beginningOfPath)
-      return str.slice(0, endOfPath)
+    const isMatched = expectedOutputLines.every((line, index) => {
+      const matched = stdoutLines[index].startsWith(line)
+      return matched
     })
 
-    expect(mappedOutputLines).toEqual(expectedOutputLines)
+    expect(isMatched).toBe(true)
   })
 
   it('should prefetch data for static pages', async () => {
@@ -371,29 +339,4 @@ describe('Switchable runtime (dev)', () => {
       'This is a static RSC page.'
     )
   })
-
-  it('should build /api/hello as an api route with edge runtime', async () => {
-    const response = await fetchViaHTTP(context.appPort, '/api/hello')
-    const text = await response.text()
-    expect(text).toMatch(/Hello from .+\/api\/hello/)
-
-    const manifest = await readJson(
-      join(context.appDir, '.next/server/middleware-manifest.json')
-    )
-    expect(manifest).toMatchObject({
-      functions: {
-        '/api/hello': {
-          env: [],
-          files: [
-            'server/edge-runtime-webpack.js',
-            'server/pages/api/hello.js',
-          ],
-          name: 'pages/api/hello',
-          page: '/api/hello',
-          regexp: '^/api/hello$',
-          wasm: [],
-        },
-      },
-    })
-  })
 })