{"record":{"id":"014c8e233e3f49c4","repo":"Zie619/n8n-workflows","slug":"invalid-quantity-requested-quantityrequested","errorCode":null,"errorMessage":"Invalid quantity Requested: ${quantityRequested}. Must be greater than 0","messagePattern":"Invalid quantity Requested: (.+?)\\. Must be greater than 0","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"workflows/Code/0926_Code_Webhook_Create_Webhook.json","lineNumber":1591,"sourceCode":" \"parameters\": {\n \"sendTo\": \"example@gmail.com\",\n \"message\": \"=\\n\\n\\n \\n \\n Low Stock Alert\\n \\n\\n\\n
\\n

Low Stock Alert

\\n

Dear Stock Manager,

\\n\\n

We have detected a low stock level for the following material:

\\n\\n
\\n {{ $json[\\\"Alert Message\\\"] }}\\n
\\n\\n \\n\\n
\\n

Please take action to reorder this material.

\\n Reorder Now\\n
\\n\\n
\\n

Regards,
Your Company

\\n
\\n
\\n\\n\",\n \"options\": {},\n \"subject\": \"Low Stock Alert: Immediate Action Required\"\n },\n \"typeVersion\": 2.1,\n \"notes\": \"This gmail node performs automated tasks as part of the workflow.\"\n },\n {\n \"id\": \"ac8781e9-f694-467d-b40b-95bdbab98880\",\n \"name\": \"Validate Issue Request Data\",\n \"type\": \"n8n-nodes-base.code\",\n \"position\": [\n 6340,\n 3400\n ],\n \"parameters\": {\n \"jsCode\": \"const input = $input.all()[0].json;\\nconst quantityRequested= input[\\\"Quantity Requested\\\"];\\n\\nif (quantityRequested <= 0) throw new Error(`Invalid quantity Requested: ${quantityRequested}. Must be greater than 0`);\\n\\nreturn { json: input };\"\n },\n \"typeVersion\": 2,\n \"notes\": \"This code node performs automated tasks as part of the workflow.\"\n },\n {\n \"id\": \"6d88db70-6b4f-47c5-8093-ab339762edbe\",\n \"name\": \"Verify Requested Quantity\",\n \"type\": \"n8n-nodes-base.code\",\n \"position\": [\n 6560,\n 3400\n ],\n \"parameters\": {\n \"jsCode\": \"const input = $input.all()[0].json;\\nconst quantityRequested = input[\\\"Quantity Requested\\\"];\\nif (!input[\\\"Product ID\\\"]) throw new Error(\\\"Product ID is missing\\\");\\nif (quantityRequested <= 0) throw new Error(`Invalid quantity requested: ${quantityRequested}`);\\nif (!input[\\\"Submission ID\\\"]) throw new Error(\\\"Submission ID is missing\\\");\\nreturn { json: input };\"\n },\n \"typeVersion\": 2,\n \"notes\": \"This code node performs automated tasks as part of the workflow.\"\n },","sourceCodeStart":1573,"sourceCodeEnd":1609,"githubUrl":"https://github.com/Zie619/n8n-workflows/blob/94007c1445d9258a7da116646b79473e7c7c3282/workflows/Code/0926_Code_Webhook_Create_Webhook.json#L1573-L1609","documentation":"Thrown by 'Validate Issue Request Data' when `Quantity Requested` from the issue-request webhook is <= 0. The check runs on the raw input (no parsing), so undefined also compares <= 0 in JS (undefined <= 0 is false - actually undefined converts to NaN, so NaN <= 0 is false; but '0', empty string '', and 0 all pass the throw). Empty string '' <= 0 is true, so blank submissions throw here.","triggerScenarios":"Submission with Quantity Requested = 0, '0', or '' (empty string); a -1 test value; input.readOnly draft submissions; type coercion surprises: '5abc' is NaN so it does NOT throw here and fails later.","commonSituations":"Request form allows 0 or blank quantity; form validation missing client-side; numeric field submitted as text with empty value.","solutions":["Parse first, then validate: use Number.isFinite and > 0 so both garbage and non-positive values are caught.","Enforce min=1 and required on the quantity field in the request form.","Include the raw value and its type in the error for diagnosis.","Route failures to an error-response branch that tells the requester instead of failing silently."],"exampleFix":"// before\nconst quantityRequested = input[\"Quantity Requested\"];\nif (quantityRequested <= 0) throw new Error(`Invalid quantity Requested: ${quantityRequested}. Must be greater than 0`);\n\n// after\nconst quantityRequested = Number(input[\"Quantity Requested\"]);\nif (!Number.isFinite(quantityRequested) || quantityRequested <= 0) {\n throw new Error(`Invalid quantity Requested: ${JSON.stringify(input[\"Quantity Requested\"])}. Must be a number greater than 0`);\n}","handlingStrategy":"validation","validationCode":"const quantityRequested = Number(input['Quantity Requested']);\nif (!Number.isFinite(quantityRequested) || quantityRequested <= 0) {\n throw new Error(`Invalid quantity Requested: ${JSON.stringify(input['Quantity Requested'])}. Must be greater than 0`);\n}","typeGuard":"const isValidRequestedQty = (v) => {\n const n = Number(v);\n return Number.isFinite(n) && n > 0;\n};","tryCatchPattern":null,"preventionTips":["Convert to Number before comparing - raw '<= 0' lets NaN slip through","Set min=1 and required on the request form","Echo the raw value (JSON.stringify) in the error","Route invalid submissions to a user-facing error response branch"],"tags":["n8n","webhook","validation","type-coercion","inventory"],"backgroundTag":null,"analyzedSha":"94007c1445d9258a7da116646b79473e7c7c3282","analyzedAt":"2026-08-15T04:10:37.591Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}