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fix: surface a clear error on non-JSON API responses instead of crashing - #1093
fix: surface a clear error on non-JSON API responses instead of crashing#1093ralphstodomingo wants to merge 9 commits into
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📝 WalkthroughWalkthroughThe SDK build script now validates generated-client patches and limits parse-error bodies to markup responses. CI verifies regeneration and drift. The v2 interceptor normalizes HTML content types. Tests cover generated-client alignment and live response parsing. ChangesSDK JSON response guards
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk:🔵 Low · up to The SDK now reports actionable errors for non-JSON API responses instead of crashing. A CI check still validates only the v2 generated output, so changes in the v1 generated tree could escape drift detection and be overwritten; the PR is otherwise mergeable with owner awareness and follow-up. Suggested reviewers: Poem
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Full details: Description checkExplanation The description explains the issue, root cause, implementation, scope, rationale, verification results, and known build limitation. It omits the template's Type of change and Checklist sections, but the core required information is present and the description is mostly complete. Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 3 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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ralphstodomingo
commented
Aug 12, 2026
Verified via E2E repro (Bun)Drove the actual Before — unpatched client on The exact string from telemetry. The JavaScriptCore phrasing confirms it runs in the Bun CLI (not the Node extension), and the throw pins the crash to the JSON success-path parse in After — this PR: Control — valid JSON 200 against the patched client: parses fine ( |
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8249569Compareralphstodomingo
commented
Aug 12, 2026
Re-verified after the review round: both hunks now wrapped in |
ralphstodomingo
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Aug 12, 2026
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Pull request overview
This PR hardens the generated JavaScript SDK clients to handle non-JSON bodies on successful (2xx) responses by converting raw JSON parse crashes into an actionable error that calls out the received Content-Type and HTTP status.
Changes:
- Add a guarded
JSON.parseon the success path for the v2 generated client when parsing JSON fromresponse.text(). - Split
"json"out of the v1 client’s fall-through parse switch so JSON parsing can be guarded without affecting otherparseAsmodes.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| packages/sdk/js/src/v2/gen/client/client.gen.ts | Wraps JSON parsing in a try/catch on 2xx responses to replace raw parse crashes with a clearer error. |
| packages/sdk/js/src/gen/client/client.gen.ts | Separates "json" parsing from the generic response[parseAs]() path to guard JSON parse failures while keeping other parse modes unchanged. |
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Code Review SummaryStatus: No Issues Found | Recommendation: Merge Files Reviewed (4 files)
Previous Review Summaries (8 snapshots, latest commit 21f6529)Current summary above is authoritative. Previous snapshots are kept for context only. Previous review (commit 21f6529)Status: 1 Issue Found | Recommendation: Address before merge Overview
Issue Details (click to expand)SUGGESTION
Files Reviewed (5 files)
Fix these issues in Kilo Cloud Previous review (commit e6d0732)Status: No Issues Found | Recommendation: Merge Files Reviewed (5 files)
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Reviewed by deepseek-v4-pro · Input: 52K · Output: 16.4K · Cached: 440.2K Review guidance: REVIEW.md from base branch |
ralphstodomingo
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Aug 14, 2026
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Review summary
Verdict: request changes. One blocking issue, one coverage gap, one missing test. Details on the first three are inline.
The diagnosis is right and the implementation is careful in the places that matter. Reading the body outside the try is the non-obvious call and it's the correct one — a socket reset or abort mid-read keeps its own error identity instead of getting mislabeled a proxy error page, and the inline comment says why. { cause } preserves the original SyntaxError, lib: ["es2022"] in packages/sdk/js/tsconfig.json makes the two-arg Error constructor typecheck, and splitting "json" out of the v1 fall-through is mechanically clean — arrayBuffer/blob/formData/text still dispatch through response[parseAs]() and parseAs resolution is unchanged. The marker format is right too (balanced, upstream_fix: prefix, no redundant nesting).
Major: no regression test
packages/sdk/js has no test suite, but the SDK is exercised from packages/opencode/test/server/ — sdk-error-shape.test.ts, sdk-v1-smoke.test.ts, httpapi-sdk.test.ts all build a client with an injected fetch, which makes faking this a ten-liner:
constsdk=createOpencodeClient({baseUrl: "http://test",fetch: (async()=>newResponse("<!DOCTYPE html><html>502</html>",{status: 200,headers: {"content-type": "application/json"},}))asunknownastypeoffetch,})awaitexpect(sdk.session.list()).rejects.toThrow(/notJSON/)Two reasons this is more than a box-tick. First, a test is the only mechanism that catches the regeneration wipe. Second, the trigger is counter-intuitive: the instinct is to return Content-Type: text/html, which never reaches the guard — the test has to use application/json with an HTML body. That subtlety belongs in a committed test rather than a PR description. The E2E matrix in the description is real work; it just isn't running anywhere.
REVIEW.md is explicit that CI here covers types and marker presence, not runtime behavior.
Minor
- The throw bypasses
interceptors.errorand thethrowOnError: falsecontract. Both wrappers registerclient.interceptors.error.use(wrapClientError), and those run only on the non-ok branch. A success-paththrowskips them — including any consumer-registered telemetry hook — and escapes regardless ofthrowOnError: false, which otherwise promises a{ data, error }tuple. This is not a regression:JSON.parse(text)threw a rawSyntaxErrorfrom the identical position before, so no caller ever got a result tuple for this failure class. But this was the natural moment to route it through the normal error path, and that's also why this error class is invisible towrapClientError. causeshape diverges from the error-path convention.error-interceptor.ts:31,35,41attachescause: { body, status }; this attaches the rawSyntaxError. Defensible — different failure classes — and the inline suggestion on the message resolves it incidentally.
Nits
gen/client/client.gen.ts:132uses"content-type"; line 110 in the same function uses"Content-Type".Headers.getis case-insensitive so it works, but pick one.- Twelve byte-identical lines across the two clients. A
parseJsonOrThrow(text, request, response)helper inpackages/sdk/js/src/—error-interceptor.tsis the precedent for shared non-generated client logic — would shrink the fork delta to two one-line calls and compose cleanly with the post-gen patch. - The v1 comment runs six lines to v2's three for identical logic.
Test matrix worth committing
- 200 +
application/json+ HTML body → actionable error,causeis aSyntaxError. v1 and v2. (the shipped bug) - 200 +
text/html; charset=utf-8+ HTML body → currently returns a string asdata. - 200 + no
Content-Type+ HTML body → currently returns a stream asdata. - v1 chunked 200, empty body, no
Content-Length→ asserts the new{}rather than the old throw. - 200 +
application/json+ valid JSON, and valid JSON under a wrong content-type → guard must not fire. responseValidator/responseTransformerstill run after a successful parse (v1 regression guard).- Body-read failure mid-stream still surfaces the socket error, not the proxy message — pins the outside-the-
tryplacement against future edits. - Codegen idempotence: run
packages/sdk/js/script/build.ts, assert the guard survives.
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All reported issues were addressed across 5 files (changes from recent commits).
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The release-build problem is genuinely fixed, and worth confirming explicitly since it was the blocking one. I checked it three ways rather than relying on the description:
jsonGuardNeedleis byte-identical to line 190 of the pinned@hey-api/openapi-ts@0.90.10fetch template — ten leading spaces, trailing semicolon, and exactly one occurrence in the file. The trailing-semicolon detail was the right catch; it is precisely what would have made this fail silently.- A full
script/build.tsrun against a clean checkout wipessrc/v2/genand lands the guard in the regenerated, prettified output.request,textandresponseare all in scope at the injection point, andbun tscatbuild.ts:94compiles the result before publish. bun test test/sdk-json-guard.test.tspasses 4/4.
Also confirmed: the interceptor normalization is correct and runs at client.gen.ts:118, beforeparseAs resolution at :130, so it fires regardless of parse mode — which is why the honestly-labeled text/html case is now covered end to end. Leaving stream and blob uncovered and saying so in the description is the right call. And the body read staying outside the guard, so socket resets keep their own error identity, survived this rewrite rather than being lost in it.
Four inline comments above. The rest:
No CI job runs the SDK build. The only script/build.ts invocations in the workflows are packages/opencode/script/build.ts (ci.yml:502, release.yml:92) — the binary build. packages/sdk/js/script/build.ts first executes inside script/publish.ts:28. The loud throw is the right failure mode but fires at the worst moment. The exact version pin bounds this to dependency-bump PRs, which is precisely the PR that goes green and then breaks the next release. The reproducible-codegen step in the second inline comment fixes this and the drift-detection gap together.
cause is no longer an Error.15a452ae4 attached the SyntaxError directly as cause; this commit nests it as cause.parseError. So err.cause instanceof SyntaxError now fails, and default cause-chain printing no longer surfaces the parse detail on its own. Matching error-interceptor.ts's { body, status } shape is defensible — the new shape is a superset — but the earlier thread was resolved on the old behavior, so this is worth a line there rather than a silent change.
Nits
packages/sdk/js/src/gen/client/client.gen.tsnow spells the same concept three ways in one function:Content-Length(:100),Content-Type(:111),content-type(:135).Headers.getis case-insensitive, so purely cosmetic.- The guard body now exists in three places — v1's file, v2's committed file, and the string array in
build.ts. The second inline comment is what that already cost on day one. sdk-json-guard.test.ts:63asserts onlycause.body;cause.parseError,cause.statusand the 200-char truncation could all go missing undetected.sdk-json-guard.test.ts:73—expect(String(err)).toContain("text/html")does correctly isolate the interceptor (that route resolvesparseAsto"text", so the guard cannot fire on it, and removing the normalization makeserrnull). Exact-message matching would additionally pin the message contract, but nothing is broken as written.- The open automated-review comment on
sdk-json-guard.test.ts:12is worth taking. It is framed as Windows-only, but the percent-encoding half bites anywhere: a checkout under a directory containing a space resolves to%20andBun.filecannot open it, so the canary throws instead of asserting.
Still untested
- v1: mislabeled
application/json+ HTML body. - v1:
parseAs: "text"round-trip. - v1: chunked-empty 200 →
{}. - Reproducible codegen: build, then
git diff --exit-code src/v2/gen. - Interceptor:
TEXT/HTMLandtext/html ; charset=utf-8— the normalization handles both, nothing pins it. cause.parseError/cause.statuspresence and the body truncation.
Nothing here is blocking.
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When a proxy, gateway or CDN returns an HTTP 200 with an HTML body (an error or interstitial page) instead of JSON, the generated SDK client JSON-parses it and throws a raw `JSON Parse error: Unrecognized token '<'`. `parseAs` falls back to "json" whenever Content-Type is missing or unrecognized, so a non-JSON body reaches the parser. The error path was already guarded; the success path was not. Guard the JSON parse in both the v1 and v2 generated clients: on a parse failure, throw an actionable error (non-JSON response, likely a proxy/gateway error page, with HTTP status + content-type) instead of the raw parse crash. In v1, "json" is split out of the shared fall-through group so the other parse modes (arrayBuffer/blob/formData/text) keep dispatching via response[parseAs](). Both hunks are wrapped in `altimate_change start — upstream_fix:` markers, the repo convention for local deviations that should survive upstream bridge merges and eventually land upstream. Surfaced from telemetry as a recurring extension sendMessageError.
Addresses Copilot review: the guard's actionable message discarded the
underlying SyntaxError (token/position detail). Attach it via
new Error(msg, { cause }) — the SDK's existing convention
(error-interceptor.ts).…rrors Addresses the human review: - the v2 guard now ships: script/build.ts re-applies it after codegen (clean: true wipes src/v2/gen on every release build), using the SseFn-patch pattern — needle-match against raw codegen output (trailing semicolon included) with a loud failure if the template drifts. Verified by running the full build: the regenerated tree carries the guard. Drift canaries pin both halves. - the v2 html interceptor normalizes content-type before comparing, so 'text/html; charset=utf-8' — the form proxies actually send — is caught instead of returned as a string payload. - the error carries request identity (method + URL), names the content-type honestly, and keeps a 200-char body slice on cause for debugging; telemetry stays body-free. - live-server tests drive both failure shapes end to end: HTML mislabeled as application/json (guard) and honestly-labeled text/html with charset (interceptor).
The re-apply step lives in an upstream-shared file; the marker guard rightly flagged it unmarked.
…overage
- the error names method + pathname, never request.url: the query
string carries directory=<absolute cwd> on every GET (percent-encoded,
so path masking could not have caught it) — all three copies
- build.ts emits the same comment lines the committed block carries, so
a release build round-trips client.gen.ts byte-for-byte (verified by
running the build); CI asserts that for the patched file. main's
types.gen.ts itself does not round-trip today — tracked separately
- drift detection now checks the needle against the generator TEMPLATE
on disk (resolved through the sdk package root), not build.ts's own
literal; the literal pin stays as friction
- v1 has runtime coverage: mislabeled-JSON error (query-free), parseAs
text dispatch through the split switch, chunked-empty 200 -> {}
- fileURLToPath instead of URL.pathname (Windows drive-letter paths)14bee22 to
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In @.github/workflows/ci.yml:
- Around line 125-132: Update the CI codegen check around script/build.ts so
openapi.json is asserted while it still exists, or preserve the file through
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ralphstodomingo
commented
Aug 26, 2026
@sahrizvi ready for re-review at |
The check ran build.ts, which regenerates the (drifted) gen tree on the runner, and the test step then ran against the mutated checkout — two SDK tests failed on the regenerated types. The check itself passed; it now restores src/v2/gen and removes openapi.json before exiting.
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In @.github/workflows/ci.yml:
- Around line 133-137: Update the build verification step around script/build.ts
to capture its exit status instead of converting failures to warnings. Continue
with the openapi.json and generated-client drift checks and cleanup, then return
the captured build failure status while preserving any relevant diff-check
failure.
- Around line 130-136: Add rm -rf dist to the cleanup command after the build in
the workflow, alongside git checkout -- src/v2/gen and removal of openapi.json,
so the generated ignored dist directory is removed before subsequent test steps.
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sahrizvi
commented
Aug 26, 2026
Review summaryVerdict: request changes. The runtime guard is correct, and the earlier rounds genuinely resolved what they claimed to — body read outside the guard, Four findings are posted inline ( MAJOR — v1 has no |
…arkup; honest codegen check Review round 3: - build.ts: `patchOnce` — String.replace patches the first match only, so both the SseFn and JSON-guard patches now fail the build on zero OR many sites; the template canary in the test asserts an exact count too - the response body rides on `cause` only when it looks like markup: util/error.ts serializes `cause` into logs, and a truncated or malformed real JSON response must not put its first 200 characters there (build.ts template + both generated clients; live test drives a sentinel secret through errorData for v1 and v2) - CI "SDK codegen is reproducible": cleanup is an unconditional EXIT trap covering src/gen, src/v2/gen (tracked and untracked), dist and openapi.json; the asserted file is removed before the build so an early codegen failure can no longer pass on the committed copy; a non-zero build is tolerated only when the file was regenerated AND round-trips — tsc on the regenerated tree fails until #1148, which the step records; drop the tolerance with it Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GayJFsfg2q2FoAG2XSVsZF
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e6d0732Compareralphstodomingo
commented
Aug 26, 2026
Round 3 addressed in e6d0732 — 4/4 threads replied and resolved above.
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In @.github/workflows/ci.yml:
- Line 145: Update the generated-output drift check in the CI step around
drift_rc so it validates both src/gen and src/v2/gen, including tracked
modifications and untracked files, before allowing the job to pass. Preserve the
existing failure-status handling and ensure cleanup cannot remove generated
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…ilure by signature - a proxy/gateway page can echo the request URL, query included — only its <title> rides on cause now (all three copies); live test with an echoing Express-style page for v1 and v2 - the codegen CI step tolerates a non-zero build only when the log carries the "tsc" exited with code signature (#1148) — any earlier failure exits with the build's status; the drift check is also cleaned of build.log Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GayJFsfg2q2FoAG2XSVsZF
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….body A proxy/CDN page can render the request path and query inside its <title>; a title carrying any of / ? = % is dropped (a gateway title never has them). Live fixtures with raw and percent-encoded echoed titles for v1 and v2. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GayJFsfg2q2FoAG2XSVsZF
Closes#1119
What
When a proxy / gateway / CDN returns an HTTP 200 with an HTML body (an error or interstitial page) instead of JSON, the generated SDK client crashes with a raw
JSON Parse error: Unrecognized token '<'.parseAsfalls back to"json"(?? "json") wheneverContent-Typeis missing or unrecognized, so a non-JSON body reaches the parser. The error response path was already guarded; the success path was not.Fix
Guard the JSON parse in the success path of both generated clients. On a parse failure, throw an actionable error naming the received content-type + HTTP status ("…usually a proxy or gateway error page, not the API") instead of the raw parse crash.
packages/sdk/js/src/v2/gen/client/client.gen.ts— the client the CLI imports (@opencode-ai/sdk/v2)packages/sdk/js/src/gen/client/client.gen.ts— v1:jsonis split out of the shared fall-through group soarrayBuffer/blob/formData/textkeep dispatching viaresponse[parseAs]()Both hunks are wrapped in
altimate_change start — upstream_fix:markers — the repo convention for local deviations from upstream, so the bridge-merge process sees and carries them, and they can be retired if/when the fix lands upstream.Verification (E2E under Bun, full parse-mode matrix)
Drove each actual client file against a local server. 7 cases × v1/v2 × before/after:
json+ HTML body (JSON content-type)SyntaxError: JSON Parse error: Unrecognized token '<'(v2) /Failed to parse JSON(v1)Expected a JSON response but received application/json (HTTP 200). This is usually a proxy or gateway error page, not the API.json+ valid JSONjson+ empty body{}{}(unchanged)parseAs: blobBlobBlob(unchanged)parseAs: arrayBufferArrayBufferArrayBuffer(unchanged)parseAs: textparseAs: formData(real multipart)FormDatafield=valueFormDatafield=value (unchanged)The v2 "before" error is the exact string seen in telemetry (JavaScriptCore phrasing → confirms the crash runs in the Bun CLI, not the Node extension).
packages/sdk/jstypecheck (tsgo --noEmit) passes.Where it came from
Surfaced by the extension telemetry-triage bot as a recurring
ChatPanel:chat:sendMessageError(~11 machines / 7d).Post-review revision (2026-08-21)
The human review reshaped this PR; the description above predates it. Current state:
script/build.ts, not the gen file:clean: trueregeneratessrc/v2/genon every release build, so the guard is re-applied post-codegen (the SseFn-patch pattern), needle-matched against raw codegen output with a loud failure on template drift. The in-tree gen copy mirrors the post-build state. The earlier marker rationale doesn't apply to the gen trees (analyze.tsexcludes them from marker checks); v1's hunk survives becausesrc/genis a frozen snapshot, not because of markers.text/html(incl.; charset=utf-8) → normalized v2 interceptor. Correction to the original text: an absent content-type resolvesparseAstostream(notjson); stream/blob-resolved bodies remain out of scope for this PR and would need interceptor-level handling.cause; body stays out of the message.case "json"previously threwSyntaxErroron an empty body (the original matrix here was wrong); it now returns{}, aligned with v2, which also meansresponseValidatornow runs against{}for chunked-empty 200 responses where it was previously unreachable.build.tsrun confirms the patch applies to freshly generated output; drift canaries pin both gen files and the build-script needle; live-server tests (packages/opencode/test/sdk-json-guard.test.ts) drive both failure shapes end to end.🤖 Generated with Claude Code
https://claude.ai/code/session_01LKJeLDMhBaYu16LrjGCf25
Summary by CodeRabbit
Bug Fixes
Tests