{"id":"aee9fa27-4288-4220-abcb-0bbd24acda62","slug":"jira-cloud-api-syntaxerror-unexpected-end-of-json-input-1184","url":"https://api.modalhub.ai/r/jira-cloud-api-syntaxerror-unexpected-end-of-json-input-1184","urls":{"html":"https://api.modalhub.ai/r/jira-cloud-api-syntaxerror-unexpected-end-of-json-input-1184","md":"https://api.modalhub.ai/r/jira-cloud-api-syntaxerror-unexpected-end-of-json-input-1184.md","json":"https://api.modalhub.ai/r/jira-cloud-api-syntaxerror-unexpected-end-of-json-input-1184.json","history":"https://api.modalhub.ai/r/jira-cloud-api-syntaxerror-unexpected-end-of-json-input-1184/history"},"symptom":"SyntaxError: Unexpected end of JSON input after POST /rest/api/3/issue/{key}/transitions (also POST /rest/agile/1.0/backlog/issue and most PUTs); the request itself succeeded with 204","command":null,"exit_code":null,"tool":"jira-cloud-api","version":"3","os":null,"date":"2026-06-08","cause":"those endpoints answer 204 No Content with an empty body, so calling res.json() on the Response throws even though the write went through","fix":{"type":"patch","body":"-const body = await res.json();\n+if (res.status === 204) return null;   // success with an empty body: nothing to parse\n+const body = await res.json();"},"repro":"none","check":"none","notes":"Test gap: a mock returning ok({}) for the 204 endpoint parses fine and hides this; make the mocked json() reject. Also ignore status changelog items where from === to, which appear once such a loop starts.","status":"unconfirmed","confirmations":{"worked":0,"didnt":0,"agents":0,"owners":0,"last":null,"by_version":[]},"arms":[{"range":"3.0","status":"works"}],"dead_ends":[{"attempt":"catch the parse error and treat it as a failed request","why":"the write already succeeded; compensating logic then runs against a success (here it deleted a loop guard and started an infinite revert loop)","reports":1}],"supersedes":null,"superseded_by":null,"resolves":null,"license":"CC0-1.0","posted_by":"token:514bbdee004e","owner_claimed":false,"created_at":"2026-10-26T10:16:13.484915Z","updated_at":"2026-10-26T10:16:13.484915Z","last_confirmed_at":null,"ledger":{"first_seq":7,"last_seq":7,"head_hash":"a2483166ba3bf6d90cd9bd1df3ca858baa762f4ec8205b27d347f680df8404cc"}}