{"record":{"id":"0504f50487097f4a","repo":"FlowiseAI/Flowise","slug":"invalid-json-in-the-baseoptions-exception","errorCode":null,"errorMessage":"Invalid JSON in the BaseOptions: ${exception}","messagePattern":"Invalid JSON in the BaseOptions: (.+?)","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/components/nodes/chatmodels/ChatCometAPI/ChatCometAPI.ts","lineNumber":161,"sourceCode":"        }\n\n        if (maxTokens) obj.maxTokens = parseInt(maxTokens, 10)\n        if (topP) obj.topP = parseFloat(topP)\n        if (frequencyPenalty) obj.frequencyPenalty = parseFloat(frequencyPenalty)\n        if (presencePenalty) obj.presencePenalty = parseFloat(presencePenalty)\n        if (cache) obj.cache = cache\n\n        let parsedBaseOptions: any | undefined = undefined\n\n        if (baseOptions) {\n            try {\n                parsedBaseOptions = typeof baseOptions === 'object' ? baseOptions : JSON.parse(baseOptions)\n                if (parsedBaseOptions.baseURL) {\n                    console.warn(\"The 'baseURL' parameter is not allowed when using the ChatCometAPI node.\")\n                    parsedBaseOptions.baseURL = undefined\n                }\n            } catch (exception) {\n                throw new Error('Invalid JSON in the BaseOptions: ' + exception)\n            }\n        }\n\n        const model = new ChatOpenAI({\n            ...obj,\n            configuration: {\n                baseURL: this.baseURL,\n                ...parsedBaseOptions\n            }\n        })\n        return model\n    }\n}\n\nmodule.exports = { nodeClass: ChatCometAPI_ChatModels }\n","sourceCodeStart":143,"sourceCodeEnd":177,"githubUrl":"https://github.com/FlowiseAI/Flowise/blob/abe4a8601a058047b350c260676826e21dd14101/packages/components/nodes/chatmodels/ChatCometAPI/ChatCometAPI.ts#L143-L177","documentation":"Thrown by ChatCometAPI.init() (line 161) when baseOptions is a string that fails JSON.parse. When baseOptions is provided and is not already an object, the code attempts JSON.parse; on SyntaxError it is caught and re-thrown with the original parse exception appended. Note the converter also strips a forbidden 'baseURL' key before parsing succeeds.","triggerScenarios":"nodeData.inputs.baseOptions is a malformed JSON string (trailing comma, single quotes, unquoted keys, dangling brace, etc.).","commonSituations":"User typed baseOptions as a free-form string instead of a JSON object, copy-pasted JS object literal syntax instead of JSON, or left an unfinished fragment.","solutions":["Pass baseOptions as a real JSON object (double-quoted keys, no trailing commas): {\"timeout\": 30000}.","If unsure, leave baseOptions empty; it is optional (additionalParams: true).","Validate the string with JSON.parse in the browser console / a linter before saving the node."],"exampleFix":"// before (throws): baseOptions = \"{'timeout': 30000,}\"  // single quotes + trailing comma\n// after:           baseOptions = \"{\\\"timeout\\\": 30000}\"","handlingStrategy":"validation","validationCode":"function parseBaseOptionsSafe(raw: unknown): unknown | undefined {\n  if (raw == null || typeof raw === 'object') return raw\n  if (typeof raw !== 'string') return undefined\n  try { return JSON.parse(raw) } catch { return undefined }\n}\nconst parsed = parseBaseOptionsSafe(nodeData.inputs?.baseOptions)\nif (nodeData.inputs?.baseOptions && parsed === undefined) {\n  throw new Error('baseOptions must be valid JSON')\n}","typeGuard":"function isPlainObject(v: unknown): v is Record<string, unknown> {\n  return typeof v === 'object' && v !== null && !Array.isArray(v)\n}","tryCatchPattern":"try {\n  return await chatCometAPI.init(nodeData, '', options)\n} catch (e) {\n  if (e instanceof Error && e.message.startsWith('Invalid JSON in the BaseOptions')) {\n    // highlight the baseOptions field and show a JSON hint\n  }\n  throw e\n}","preventionTips":["Prefer passing baseOptions as a JSON object rather than a string when the UI allows it.","Run inputs through a JSON linter before saving nodes.","Document forbidden keys (baseURL) explicitly so users do not rely on the runtime strip."],"tags":["configuration","json-parsing","cometapi","validation"],"backgroundTag":null,"analyzedSha":"abe4a8601a058047b350c260676826e21dd14101","analyzedAt":"2026-08-12T16:04:40.823Z","schemaVersion":2},"datasetVersion":"2026-08-12T18:17:37.767Z"}