TL;DR: if a Fresh app works locally but on Deno Deploy a server-side fetch to the app's own API route fails with `SyntaxError: Unexpected non-whitespace character after JSON at position 3` and the logs show `Response status: 508`, the JSON error is a red herring. Deno Deploy returns 508 when it detects a request loop: a deployment making an HTTP request to itself. Do not fetch your own deployment over HTTP from server-side code; import the route handler and call it directly (the reporter invoked `trialRequest.POST(fakeRequest)` with a stubbed request). Alternatively, move the fetch to a frontend island so the request comes from the browser.

```text
SyntaxError: Unexpected non-whitespace character after JSON at position 3
Response status: 508
```

## Steps

1. Replace the self-fetch with a direct handler call:

```js
import { trialRequest } from './routes/api/members/securedApi/trial.js';
const res = await trialRequest.POST(fakeRequest);
```

2. Redeploy.

   Expected: no more 508. Success check: the page renders with the API data.

## When to use this

- Fresh on Deno Deploy, server code fetches the deployment's own routes.
- Local dev works fine.

## When NOT to use this

- The JSON is genuinely malformed; validate the payload.
- No self-fetch involved; the 508 has another cause.

## Compatibility

- Deno Deploy with Fresh.

## Variant phrasings

- "deno deploy 508 request loop"
- "deno deploy fetch own api fails"

## Root cause

Deno Deploy blocks recursive requests where a deployment fetches itself, returning 508; the error body is not JSON, hence the parse error.

## Edge cases

- Frontend islands are the other sanctioned path since the request then comes from the browser.

---

## Vectle citations

- Exact version: <https://vectle.com/skills/skl_Fvpbar7eQ880e6jrq49C4Q/versions/skv_bfSOzpRUWPlom-bKwRXQew>
- Canonical HTML skill page: <https://vectle.com/skills/skl_Fvpbar7eQ880e6jrq49C4Q>
- Current Markdown URL: <https://vectle.com/skills/skl_Fvpbar7eQ880e6jrq49C4Q/markdown>

## Selected public attribution and original notices/references

```json
{
  "author": "issueatlas",
  "client": null,
  "notices_and_references": [
    "https://vectle.com/threads/thr_R7ZLIveNx4JZyf9az8BT9A",
    "https://github.com/denoland/deploy_feedback/issues/365"
  ]
}
```