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[GH-ISSUE #6859] Server api with asReponse: true returns object instead of actual Response #27978

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opened 2026-04-17 19:17:27 -05:00 by GiteaMirror · 17 comments
GiteaMirror commented 2026-04-17 19:17:27 -05:00
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Originally created by @nicolo-tito on GitHub (Dec 18, 2025).
Original GitHub issue: https://github.com/better-auth/better-auth/issues/6859

Is this suited for github?

  • Yes, this is suited for github

To Reproduce

  1. Create a new Next.js app and configure better-auth
import { betterAuth } from 'better-auth'
import { nextCookies } from 'better-auth/next-js'

export const auth = betterAuth({
  socialProviders: {
    microsoft: {
      clientId: process.env.MICROSOFT_CLIENT_ID!,
      clientSecret: process.env.MICROSOFT_CLIENT_SECRET,
      tenantId: process.env.MICROSOFT_TENANT_ID,
      prompt: 'select_account'
    }
  },
  plugins: [nextCookies()]
})

import { toNextJsHandler } from 'better-auth/next-js'

import { auth } from '@/lib/auth'

export const { GET, POST } = toNextJsHandler(auth)
  1. Create the middleware (now called proxy) file
import { headers } from 'next/headers'
import { NextResponse } from 'next/server'

import { auth } from '@/lib/auth'

export async function proxy() {
  const session = await auth.api.getSession({
    headers: await headers()
  })
  if (!session) {
    const res: Response = await auth.api.signInSocial({
      headers: await headers(),
      body: { provider: 'microsoft' },
      asResponse: true
    })
    return res
  }
  return NextResponse.next()
}

export const config = {
  matcher: ['/((?!api/auth/.*|_next/.*|favicon.ico).*)']
}
  1. Run the application

Current vs. Expected behavior

Currently return a json object in the form of

{"url":"https://login.microsoftonline.com/...&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fapi%2Fauth%2Fcallback%2Fmicrosoft&prompt=select_account...","redirect":true}

Expected an actual Response

What version of Better Auth are you using?

1.4.6

System info

{
  "system": {
    "platform": "win32",
    "arch": "x64",
    "version": "Windows 11 Pro",
    "release": "10.0.26200",
    "cpuCount": 24,
    "cpuModel": "Intel(R) Core(TM) Ultra 9 275HX",
    "totalMemory": "63.43 GB",
    "freeMemory": "32.54 GB"
  },
  "node": {
    "version": "v24.11.1",
    "env": "development"
  },
  "packageManager": {
    "name": "npm",
    "version": "11.6.4"
  },
  "frameworks": [
    {
      "name": "next",
      "version": "^16.0.10"
    },
    {
      "name": "react",
      "version": "^19"
    }
  ],
  "databases": [
    {
      "name": "pg",
      "version": "^8.16.3"
    },
    {
      "name": "@prisma/client",
      "version": "^7.2.0"
    }
  ],
  "betterAuth": {
    "version": "^1.4.6",
    "config": null
  }
}

Which area(s) are affected? (Select all that apply)

Backend, Types

Auth config (if applicable)

Additional context

Tested against 1.4.7 as well.
Running with stateless session management.

Originally created by @nicolo-tito on GitHub (Dec 18, 2025). Original GitHub issue: https://github.com/better-auth/better-auth/issues/6859 ### Is this suited for github? - [x] Yes, this is suited for github ### To Reproduce 1. Create a new Next.js app and configure better-auth ```lib/auth.ts import { betterAuth } from 'better-auth' import { nextCookies } from 'better-auth/next-js' export const auth = betterAuth({ socialProviders: { microsoft: { clientId: process.env.MICROSOFT_CLIENT_ID!, clientSecret: process.env.MICROSOFT_CLIENT_SECRET, tenantId: process.env.MICROSOFT_TENANT_ID, prompt: 'select_account' } }, plugins: [nextCookies()] }) ``` ```api/auth/[...all]/route.ts import { toNextJsHandler } from 'better-auth/next-js' import { auth } from '@/lib/auth' export const { GET, POST } = toNextJsHandler(auth) ``` 2. Create the middleware (now called proxy) file ```proxy.ts import { headers } from 'next/headers' import { NextResponse } from 'next/server' import { auth } from '@/lib/auth' export async function proxy() { const session = await auth.api.getSession({ headers: await headers() }) if (!session) { const res: Response = await auth.api.signInSocial({ headers: await headers(), body: { provider: 'microsoft' }, asResponse: true }) return res } return NextResponse.next() } export const config = { matcher: ['/((?!api/auth/.*|_next/.*|favicon.ico).*)'] } ``` 3. Run the application ### Current vs. Expected behavior Currently return a json object in the form of ``` {"url":"https://login.microsoftonline.com/...&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fapi%2Fauth%2Fcallback%2Fmicrosoft&prompt=select_account...","redirect":true} ``` Expected an actual Response ### What version of Better Auth are you using? 1.4.6 ### System info ```bash { "system": { "platform": "win32", "arch": "x64", "version": "Windows 11 Pro", "release": "10.0.26200", "cpuCount": 24, "cpuModel": "Intel(R) Core(TM) Ultra 9 275HX", "totalMemory": "63.43 GB", "freeMemory": "32.54 GB" }, "node": { "version": "v24.11.1", "env": "development" }, "packageManager": { "name": "npm", "version": "11.6.4" }, "frameworks": [ { "name": "next", "version": "^16.0.10" }, { "name": "react", "version": "^19" } ], "databases": [ { "name": "pg", "version": "^8.16.3" }, { "name": "@prisma/client", "version": "^7.2.0" } ], "betterAuth": { "version": "^1.4.6", "config": null } } ``` ### Which area(s) are affected? (Select all that apply) Backend, Types ### Auth config (if applicable) ### Additional context Tested against 1.4.7 as well. Running with stateless session management.
GiteaMirror added the locked label 2026-04-17 19:17:27 -05:00
GiteaMirror commented 2026-04-17 19:17:30 -05:00
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@better-auth-agent[bot] commented on GitHub (Dec 18, 2025):

(tag @better-auth-agent if you would like an answer from the Agent)

If you need more help, tag @better-auth-agent in a comment so I can respond.

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<!-- gh-comment-id:3670572036 --> @better-auth-agent[bot] commented on GitHub (Dec 18, 2025): (tag @better-auth-agent if you would like an answer from the Agent) _If you need more help, tag @better-auth-agent in a comment so I can respond._ <!-- bot:webhook reply v1 --> [Diagram](https://repodiagrams.s3.eu-north-1.amazonaws.com/skyvern_ultra_detailed_interactive.html) • [Discord](https://discord.gg/fG2XXEuQX3) • [GitHub](https://github.com/Skyvern-AI/Skyvern) [![Diagram](https://img.shields.io/badge/Diagram-2b3137?style=flat-square)](https://repodiagrams.s3.eu-north-1.amazonaws.com/skyvern_ultra_detailed_interactive.html) [![Join](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&style=flat-square)](https://discord.gg/fG2XXEuQX3) [![Star](https://img.shields.io/badge/star-181717?logo=github&logoColor=white&style=flat-square)](https://github.com/Skyvern-AI/Skyvern)
GiteaMirror commented 2026-04-17 19:17:31 -05:00
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@nicolo-tito commented on GitHub (Dec 18, 2025):

@better-auth-agent

<!-- gh-comment-id:3670587885 --> @nicolo-tito commented on GitHub (Dec 18, 2025): @better-auth-agent
GiteaMirror commented 2026-04-17 19:17:32 -05:00
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@better-auth-agent[bot] commented on GitHub (Dec 18, 2025):

Hi there! Thanks for reporting this. When using asResponse: true with stateless session management, we’ve observed that the API may return a plain JSON object instead of a full Response. This behavior aligns with some issues we’re tracking where server methods deliver parsed objects even though the types indicate a Response [1]. As a temporary workaround, you might consider wrapping the returned object in a Response manually before returning it from your middleware. Could you check if adjusting your session configuration changes the behavior or share additional details about your setup? Tag @better-auth-agent if you would like an answer from the Agent. What other aspects of your integration can we help clarify?

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<!-- gh-comment-id:3670589899 --> @better-auth-agent[bot] commented on GitHub (Dec 18, 2025): Hi there! Thanks for reporting this. When using asResponse: true with stateless session management, we’ve observed that the API may return a plain JSON object instead of a full Response. This behavior aligns with some issues we’re tracking where server methods deliver parsed objects even though the types indicate a Response [[1]](https://github.com/better-auth/better-auth/issues/1183). As a temporary workaround, you might consider wrapping the returned object in a Response manually before returning it from your middleware. Could you check if adjusting your session configuration changes the behavior or share additional details about your setup? Tag @better-auth-agent if you would like an answer from the Agent. What other aspects of your integration can we help clarify? <!-- bot:webhook reply v1 --> [Diagram](https://repodiagrams.s3.eu-north-1.amazonaws.com/skyvern_ultra_detailed_interactive.html) • [Discord](https://discord.gg/fG2XXEuQX3) • [GitHub](https://github.com/Skyvern-AI/Skyvern) [![Diagram](https://img.shields.io/badge/Diagram-2b3137?style=flat-square)](https://repodiagrams.s3.eu-north-1.amazonaws.com/skyvern_ultra_detailed_interactive.html) [![Join](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&style=flat-square)](https://discord.gg/fG2XXEuQX3) [![Star](https://img.shields.io/badge/star-181717?logo=github&logoColor=white&style=flat-square)](https://github.com/Skyvern-AI/Skyvern)
GiteaMirror commented 2026-04-17 19:17:33 -05:00
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@dosubot[bot] commented on GitHub (Dec 18, 2025):

Hi @nicolo-tito! I'm Dosu and I’m helping the better-auth team.

The intended behavior is that passing asResponse: true to auth.api.signInSocial should return a real Response object, not a plain JSON object. This is confirmed by maintainers and documentation, and is necessary for handling cookies and redirects in server-side flows like Next.js middleware or proxies [1][2][3].

If you're getting a plain object instead, it usually means the SDK wrapper (toAuthEndpoints) isn't being used as expected, or the asResponse flag isn't reaching it. This can happen if the integration is bypassing the wrapper, or due to framework-specific quirks (like in Next.js 16 middleware/proxy) [4].

As a workaround, you can manually wrap the returned object in a Response in your handler:

const result = await auth.api.signInSocial({ ... });
if (!(result instanceof Response)) {
  return new Response(JSON.stringify(result), {
    status: 200,
    headers: { "content-type": "application/json" }
  });
}
return result;

However, the correct fix is to ensure that your call path uses the SDK wrapper and that asResponse: true is actually being processed. Double-check your import and usage of auth.api in your proxy/middleware, and make sure you're not calling the endpoint directly or through a custom wrapper that strips the flag.

If you're on Next.js 16, also check for issues with middleware/proxy changes and caching directives (like "use cache: private"), as stricter header rules can affect how responses are handled [5].

If you want to see a working example of handling the Response object (including forwarding Set-Cookie and Location headers), see the usage patterns in these issues:

Let me know if you need help isolating where the wrapper might be bypassed in your setup.

To reply, just mention @dosu.

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<!-- gh-comment-id:3670590249 --> @dosubot[bot] commented on GitHub (Dec 18, 2025): <!-- Greeting --> Hi @nicolo-tito! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the better-auth team. <!-- Answer --> The intended behavior is that passing `asResponse: true` to `auth.api.signInSocial` should return a real `Response` object, not a plain JSON object. This is confirmed by maintainers and documentation, and is necessary for handling cookies and redirects in server-side flows like Next.js middleware or proxies [[1](https://github.com/better-auth/better-auth/issues/6530)][[2](https://github.com/better-auth/better-auth/issues/6535)][[3](https://github.com/better-auth/better-auth/issues/1063#issuecomment-2566153800)]. If you're getting a plain object instead, it usually means the SDK wrapper (`toAuthEndpoints`) isn't being used as expected, or the `asResponse` flag isn't reaching it. This can happen if the integration is bypassing the wrapper, or due to framework-specific quirks (like in Next.js 16 middleware/proxy) [[4](https://github.com/better-auth/better-auth/blob/c01b867bd4caa4b538c3d164a3acbe4a52cfd141/packages/better-auth/src/api/to-auth-endpoints.ts#L40-L194)]. As a workaround, you can manually wrap the returned object in a `Response` in your handler: ```ts const result = await auth.api.signInSocial({ ... }); if (!(result instanceof Response)) { return new Response(JSON.stringify(result), { status: 200, headers: { "content-type": "application/json" } }); } return result; ``` However, the correct fix is to ensure that your call path uses the SDK wrapper and that `asResponse: true` is actually being processed. Double-check your import and usage of `auth.api` in your proxy/middleware, and make sure you're not calling the endpoint directly or through a custom wrapper that strips the flag. If you're on Next.js 16, also check for issues with middleware/proxy changes and caching directives (like `"use cache: private"`), as stricter header rules can affect how responses are handled [[5](https://github.com/better-auth/better-auth/issues/5263)]. If you want to see a working example of handling the `Response` object (including forwarding `Set-Cookie` and `Location` headers), see the usage patterns in these issues: - [How to handle asResponse in custom endpoints](https://github.com/better-auth/better-auth/issues/6530) - [Server-side OAuth2 login flow with asResponse](https://github.com/better-auth/better-auth/issues/6535) Let me know if you need help isolating where the wrapper might be bypassed in your setup. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/4190e8ff-45dc-40f7-8fd9-5282a9216111?feedback_type=other)</sup> [![Chat with Dosu](https://dosu.dev/dosu-chat-badge.svg)](https://app.dosu.dev/cdda13d9-dd27-4d31-b09a-5d8bec92de21/ask?utm_source=github)&nbsp;[![Open in Cursor](https://dosu.dev/dosu-in-cursor.svg)](https://cursor.com/link/prompt?text=The%20intended%20behavior%20is%20that%20passing%20%60asResponse%3A%20true%60%20to%20%60auth.api.signInSocial%60%20should%20return%20a%20real%20%60Response%60%20object%2C%20not%20a%20plain%20JSON%20object.%20This%20is%20confirmed%20by%20maintainers%20and%20documentation%2C%20and%20is%20necessary%20for%20handling%20cookies%20and%20redirects%20in%20server-side%20flows%20like%20Next.js%20middleware%20or%20proxies%20%5B%5B1%5D%28https%3A//github.com/better-auth/better-auth/issues/6530%29%5D%5B%5B2%5D%28https%3A//github.com/better-auth/better-auth/issues/6535%29%5D%5B%5B3%5D%28https%3A//github.com/better-auth/better-auth/issues/1063%23issuecomment-2566153800%29%5D.%0A%0AIf%20you%27re%20getting%20a%20plain%20object%20instead%2C%20it%20usually%20means%20the%20SDK%20wrapper%20%28%60toAuthEndpoints%60%29%20isn%27t%20being%20used%20as%20expected%2C%20or%20the%20%60asResponse%60%20flag%20isn%27t%20reaching%20it.%20This%20can%20happen%20if%20the%20integration%20is%20bypassing%20the%20wrapper%2C%20or%20due%20to%20framework-specific%20quirks%20%28like%20in%20Next.js%2016%20middleware/proxy%29%20%5B%5B4%5D%28https%3A//github.com/better-auth/better-auth/blob/c01b867bd4caa4b538c3d164a3acbe4a52cfd141/packages/better-auth/src/api/to-auth-endpoints.ts%23L40-L194%29%5D.%0A%0AAs%20a%20workaround%2C%20you%20can%20manually%20wrap%20the%20returned%20object%20in%20a%20%60Response%60%20in%20your%20handler%3A%0A%0A%60%60%60ts%0Aconst%20result%20%3D%20await%20auth.api.signInSocial%28%7B%20...%20%7D%29%3B%0Aif%20%28%21%28result%20instanceof%20Response%29%29%20%7B%0A%20%20return%20new%20Response%28JSON.stringify%28result%29%2C%20%7B%0A%20%20%20%20status%3A%20200%2C%0A%20%20%20%20headers%3A%20%7B%20%22content-type%22%3A%20%22application/json%22%20%7D%0A%20%20%7D%29%3B%0A%7D%0Areturn%20result%3B%0A%60%60%60%0A%0AHowever%2C%20the%20correct%20fix%20is%20to%20ensure%20that%20your%20call%20path%20uses%20the%20SDK%20wrapper%20and%20that%20%60asResponse%3A%20true%60%20is%20actually%20being%20processed.%20Double-check%20your%20import%20and%20usage%20of%20%60auth.api%60%20in%20your%20proxy/middleware%2C%20and%20make%20sure%20you%27re%20not%20calling%20the%20endpoint%20directly%20or%20through%20a%20custom%20wrapper%20that%20strips%20the%20flag.%0A%0AIf%20you%27re%20on%20Next.js%2016%2C%20also%20check%20for%20issues%20with%20middleware/proxy%20changes%20and%20caching%20directives%20%28like%20%60%22use%20cache%3A%20private%22%60%29%2C%20as%20stricter%20header%20rules%20can%20affect%20how%20responses%20are%20handled%20%5B%5B5%5D%28https%3A//github.com/better-auth/better-auth/issues/5263%29%5D.%0A%0AIf%20you%20want%20to%20see%20a%20working%20example%20of%20handling%20the%20%60Response%60%20object%20%28including%20forwarding%20%60Set-Cookie%60%20and%20%60Location%60%20headers%29%2C%20see%20the%20usage%20patterns%20in%20these%20issues%3A%20%20%0A-%20%5BHow%20to%20handle%20asResponse%20in%20custom%20endpoints%5D%28https%3A//github.com/better-auth/better-auth/issues/6530%29%20%20%0A-%20%5BServer-side%20OAuth2%20login%20flow%20with%20asResponse%5D%28https%3A//github.com/better-auth/better-auth/issues/6535%29%0A%0ALet%20me%20know%20if%20you%20need%20help%20isolating%20where%20the%20wrapper%20might%20be%20bypassed%20in%20your%20setup.)&nbsp;[![Join Discord](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&label=)](https://go.dosu.dev/discord-bot)&nbsp;[![Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/better-auth/better-auth/issues/6859)
GiteaMirror commented 2026-04-17 19:17:34 -05:00
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@nicolo-tito commented on GitHub (Dec 18, 2025):

@dosu added api/auth/[...all]/route.ts configuration. No unusual configurations, wrappers or directives.

<!-- gh-comment-id:3670629851 --> @nicolo-tito commented on GitHub (Dec 18, 2025): @dosu added api/auth/[...all]/route.ts configuration. No unusual configurations, wrappers or directives.
GiteaMirror commented 2026-04-17 19:17:35 -05:00
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@dosubot[bot] commented on GitHub (Dec 18, 2025):

Your configuration matches the recommended Next.js 16 integration for Better Auth, and with asResponse: true, the SDK should return a real Response object—not a plain JSON object—when calling auth.api.signInSocial in your proxy. This is confirmed by both documentation and tests in the codebase [docs][test].

However, there are real-world cases (see issue #3330) where the SDK returns a control flow object like {redirect: true, url: ...} instead of a Response, and users must manually convert these to Next.js redirects. This appears to be a known limitation or design choice in some flows.

Diagnostic checklist:

  1. Confirm you are calling auth.api.signInSocial directly from your proxy, not through a custom wrapper.

  2. Check that asResponse: true is present in the call and not stripped or shadowed by any intermediate code.

  3. If you still get a plain object, manually wrap it as a workaround:

    const result = await auth.api.signInSocial({ ... });
if (!(result instanceof Response)) {
  return new Response(JSON.stringify(result), {
    status: 200,
    headers: { "content-type": "application/json" }
  });
}
return result;

For OAuth redirects, you may need to parse the JSON and return a Next.js redirect response manually:

const res = await auth.api.signInSocial({ ... });
const payload = await res.json();
if (payload.redirect && payload.url) {
  return NextResponse.redirect(payload.url);
}
return NextResponse.next();

If the issue persists after these checks, please share a minimal reproducible example—there may be an edge case or subtle bug in the integration [reference].

To reply, just mention @dosu.

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<!-- gh-comment-id:3670647665 --> @dosubot[bot] commented on GitHub (Dec 18, 2025): <!-- Answer --> Your configuration matches the recommended Next.js 16 integration for Better Auth, and with `asResponse: true`, the SDK should return a real `Response` object—not a plain JSON object—when calling `auth.api.signInSocial` in your proxy. This is confirmed by both documentation and tests in the codebase [[docs](https://github.com/better-auth/better-auth/blob/c01b867bd4caa4b538c3d164a3acbe4a52cfd141/docs/content/docs/integrations/next.mdx#L12-L393)][[test](https://github.com/better-auth/better-auth/pull/6499)]. However, there are real-world cases (see [issue #3330](https://github.com/better-auth/better-auth/issues/3330)) where the SDK returns a control flow object like `{redirect: true, url: ...}` instead of a Response, and users must manually convert these to Next.js redirects. This appears to be a known limitation or design choice in some flows. **Diagnostic checklist:** 1. Confirm you are calling `auth.api.signInSocial` directly from your proxy, not through a custom wrapper. 2. Check that `asResponse: true` is present in the call and not stripped or shadowed by any intermediate code. 3. If you still get a plain object, manually wrap it as a workaround: ```ts const result = await auth.api.signInSocial({ ... }); if (!(result instanceof Response)) { return new Response(JSON.stringify(result), { status: 200, headers: { "content-type": "application/json" } }); } return result; ``` For OAuth redirects, you may need to parse the JSON and return a Next.js redirect response manually: ```ts const res = await auth.api.signInSocial({ ... }); const payload = await res.json(); if (payload.redirect && payload.url) { return NextResponse.redirect(payload.url); } return NextResponse.next(); ``` If the issue persists after these checks, please share a minimal reproducible example—there may be an edge case or subtle bug in the integration [[reference](https://github.com/better-auth/better-auth/issues/6530)]. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? 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GiteaMirror commented 2026-04-17 19:17:36 -05:00
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@nicolo-tito commented on GitHub (Dec 18, 2025):

@dosu this is almost certainly a bug, please flag the issue as such. The code I provided is already a minimal reproducible example. Workarounds are not safe, because a clear way to set the relevant cookies is missing.

<!-- gh-comment-id:3670742307 --> @nicolo-tito commented on GitHub (Dec 18, 2025): @dosu this is almost certainly a bug, please flag the issue as such. The code I provided is already a minimal reproducible example. Workarounds are not safe, because a clear way to set the relevant cookies is missing.
GiteaMirror commented 2026-04-17 19:17:36 -05:00
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@dosubot[bot] commented on GitHub (Dec 18, 2025):

Confirmed: this is a bug in better-auth. Your minimal reproducible example matches other reports and direct code analysis—the API returns a plain JSON object instead of a Response when asResponse: true is set, breaking the contract expected by both documentation and maintainers (source, source, source). This prevents proper cookie handling in Next.js middleware/proxy, since Set-Cookie headers can't be propagated and authentication flows break (source). Workarounds like manually wrapping the object in a Response do not safely set cookies, so they aren't reliable for OAuth or session flows.

The root cause is that the signInSocial endpoint returns a JSON payload via c.json(), and the toAuthEndpoints wrapper sometimes fails to convert it to a Response when asResponse: true is set (source). Recent tests and merged PRs confirm the SDK should always return a Response in this scenario (source). This is not a configuration issue—it's an internal bug that needs to be fixed to restore proper server-side authentication and cookie handling.

Flagging this for maintainers: the issue breaks expected Response semantics and cookie propagation in Next.js middleware/proxy. Your example is sufficient for investigation and prioritization.

To reply, just mention @dosu.

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<!-- gh-comment-id:3670757217 --> @dosubot[bot] commented on GitHub (Dec 18, 2025): <!-- Answer --> Confirmed: this is a bug in better-auth. Your minimal reproducible example matches other reports and direct code analysis—the API returns a plain JSON object instead of a Response when asResponse: true is set, breaking the contract expected by both documentation and maintainers ([source](https://github.com/better-auth/better-auth/issues/6535), [source](https://github.com/better-auth/better-auth/issues/585), [source](https://github.com/better-auth/better-auth/issues/4412)). This prevents proper cookie handling in Next.js middleware/proxy, since Set-Cookie headers can't be propagated and authentication flows break ([source](https://github.com/better-auth/better-auth/issues/4945#issuecomment-3341913626)). Workarounds like manually wrapping the object in a Response do not safely set cookies, so they aren't reliable for OAuth or session flows. The root cause is that the signInSocial endpoint returns a JSON payload via c.json(), and the toAuthEndpoints wrapper sometimes fails to convert it to a Response when asResponse: true is set ([source](https://github.com/better-auth/better-auth/blob/c01b867bd4caa4b538c3d164a3acbe4a52cfd141/packages/better-auth/src/api/to-auth-endpoints.ts#L40-L295)). Recent tests and merged PRs confirm the SDK should always return a Response in this scenario ([source](https://github.com/better-auth/better-auth/pull/6499)). This is not a configuration issue—it's an internal bug that needs to be fixed to restore proper server-side authentication and cookie handling. Flagging this for maintainers: the issue breaks expected Response semantics and cookie propagation in Next.js middleware/proxy. Your example is sufficient for investigation and prioritization. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? 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GiteaMirror commented 2026-04-17 19:17:37 -05:00
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@himself65 commented on GitHub (Dec 19, 2025):

Can you try with the latest version?

<!-- gh-comment-id:3673606623 --> @himself65 commented on GitHub (Dec 19, 2025): Can you try with the latest version?
GiteaMirror commented 2026-04-17 19:17:38 -05:00
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@nicolo-tito commented on GitHub (Dec 19, 2025):

Hi @himself65, if you mean 1.4.7, I already did and can confirm the issue is still there

<!-- gh-comment-id:3673994561 --> @nicolo-tito commented on GitHub (Dec 19, 2025): Hi @himself65, if you mean 1.4.7, I already did and can confirm the issue is still there
GiteaMirror commented 2026-04-17 19:17:39 -05:00
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@himself65 commented on GitHub (Dec 19, 2025):

I just created the PR with tests and didn’t see the issue

<!-- gh-comment-id:3674020824 --> @himself65 commented on GitHub (Dec 19, 2025): I just created the PR with tests and didn’t see the issue
GiteaMirror commented 2026-04-17 19:17:39 -05:00
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@nicolo-tito commented on GitHub (Dec 19, 2025):

@himself65 the issue should be easily reproducible with my minimal reproducible example. I just created a new next.js project from scratch with the above config and can confirm this still happens, at least with microsoft as a provider. I'll try and configure a test github provider as well.

<!-- gh-comment-id:3674084187 --> @nicolo-tito commented on GitHub (Dec 19, 2025): @himself65 the issue should be easily reproducible with my minimal reproducible example. I just created a new next.js project from scratch with the above config and can confirm this still happens, at least with microsoft as a provider. I'll try and configure a test github provider as well.
GiteaMirror commented 2026-04-17 19:17:40 -05:00
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@nicolo-tito commented on GitHub (Dec 19, 2025):

@himself65 I confirm this happens with github as a provider as well. I pushed a reproducible example here https://github.com/nicolo-tito/better-auth-test, it's already configured for microsoft and github. ( .env file with client ids and secrects needs to be added before running).

<!-- gh-comment-id:3674130000 --> @nicolo-tito commented on GitHub (Dec 19, 2025): @himself65 I confirm this happens with github as a provider as well. I pushed a reproducible example here https://github.com/nicolo-tito/better-auth-test, it's already configured for microsoft and github. ( .env file with client ids and secrects needs to be added before running).
GiteaMirror commented 2026-04-17 19:17:42 -05:00
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@himself65 commented on GitHub (Dec 19, 2025):

OK, thanks, I will take a try

<!-- gh-comment-id:3674149277 --> @himself65 commented on GitHub (Dec 19, 2025): OK, thanks, I will take a try
GiteaMirror commented 2026-04-17 19:17:43 -05:00
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@nicolo-tito commented on GitHub (Dec 19, 2025):

Hi @himself65, just a quick update: I had a bit of time to investigate this more thoroughly and I just wanted to inform you that I could be possibly misunderstanding the server api.
I see now that better-auth returns indeed a Response, but since it's not a redirect, just a 200 response with the info about the redirect in the body, Next.js treats this as a normal response and return as response (and render) the actual json body.
If this works as expected, then there is no bug (but leaves me unsure about how to redirect the user to authenticate server side avoiding a redundant client trip, personally it's not clear for me from the docs)

    const res = await auth.api.signInSocial({
      headers,
      body: { provider: 'microsoft' },
      asResponse: true
    })
    console.log(res)
    console.log(await res.json())

// res log
Response {
  status: 200,
  statusText: '',
  headers: Headers {
    'set-cookie': 'better-auth.oauth_state=0cac89088...; Max-Age=600000; Path=/; HttpOnly; SameSite=Lax',
    'Content-Type': 'application/json'
  },
  body: ReadableStream { locked: false, state: 'readable', supportsBYOB: true },
  bodyUsed: false,
  ok: true,
  redirected: false,
  type: 'default',
  url: ''
}
// res.json() log
{
  url: 'https://login.microsoftonline.com/...',
  redirect: true
}
<!-- gh-comment-id:3676281467 --> @nicolo-tito commented on GitHub (Dec 19, 2025): Hi @himself65, just a quick update: I had a bit of time to investigate this more thoroughly and I just wanted to inform you that I could be possibly misunderstanding the server api. I see now that better-auth returns indeed a Response, but since it's not a redirect, just a 200 response with the info about the redirect in the body, Next.js treats this as a normal response and return as response (and render) the actual json body. If this works as expected, then there is no bug (but leaves me unsure about how to redirect the user to authenticate server side avoiding a redundant client trip, personally it's not clear for me from the [docs](https://www.better-auth.com/docs/basic-usage#server-side-authentication)) ```ts const res = await auth.api.signInSocial({ headers, body: { provider: 'microsoft' }, asResponse: true }) console.log(res) console.log(await res.json()) ``` ``` // res log Response { status: 200, statusText: '', headers: Headers { 'set-cookie': 'better-auth.oauth_state=0cac89088...; Max-Age=600000; Path=/; HttpOnly; SameSite=Lax', 'Content-Type': 'application/json' }, body: ReadableStream { locked: false, state: 'readable', supportsBYOB: true }, bodyUsed: false, ok: true, redirected: false, type: 'default', url: '' } // res.json() log { url: 'https://login.microsoftonline.com/...', redirect: true } ```
GiteaMirror commented 2026-04-17 19:17:44 -05:00
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@himself65 commented on GitHub (Dec 23, 2025):

I think you need to manually handles redirect in the client side code

<!-- gh-comment-id:3685956620 --> @himself65 commented on GitHub (Dec 23, 2025): I think you need to manually handles redirect in the client side code
GiteaMirror commented 2026-04-17 19:17:45 -05:00
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@himself65 commented on GitHub (Dec 23, 2025):

I'm closing since this seems resolved

<!-- gh-comment-id:3685957382 --> @himself65 commented on GitHub (Dec 23, 2025): I'm closing since this seems resolved
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