{
  "name": "78 Schema check (reference)",
  "nodes": [
    {
      "name": "Check webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "parameters": {
        "httpMethod": "POST",
        "path": "my-check",
        "responseMode": "responseNode",
        "options": {}
      },
      "position": [
        0,
        300
      ],
      "id": "c042a07f-a8f7-565f-b562-64bdc1e951e1",
      "webhookId": "a46fe9fe-4604-5c34-8435-2d87f4063861"
    },
    {
      "name": "Get schema",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "parameters": {
        "url": "=http://data-api:8800/schemas/{{ encodeURIComponent($json.body.schema ?? '') }}",
        "options": {
          "response": {
            "response": {
              "neverError": true
            }
          }
        }
      },
      "position": [
        220,
        300
      ],
      "id": "e7a886c9-f582-578b-bb91-75b1b0464de0"
    },
    {
      "name": "Known schema?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "loose",
            "version": 2
          },
          "conditions": [
            {
              "id": "c1",
              "leftValue": "={{ $json.fields !== undefined }}",
              "rightValue": "",
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "position": [
        440,
        300
      ],
      "id": "368be2eb-9471-523a-88c7-adb0d427375b"
    },
    {
      "name": "Unknown schema",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ JSON.stringify({ error: 'unknown schema', schema: $('Check webhook').first().json.body.schema ?? null }) }}",
        "options": {
          "responseCode": 400
        }
      },
      "position": [
        660,
        560
      ],
      "id": "482f3c8d-6a2c-5b9a-9f5c-056b8bf51986"
    },
    {
      "name": "Check rows",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "parameters": {
        "jsCode": "const body = $('Check webhook').first().json.body;\nconst schema = $json;\nlet items = body.items;\nif (typeof body.csv === 'string') {\n  const [head, ...lines] = body.csv.trim().split(/\\r?\\n/);\n  const cols = head.split(',').map((c) => c.trim());\n  items = lines.map((line) => Object.fromEntries(line.split(',').map((v, i) => [cols[i], v.trim()])));\n}\nconst isDate = (v) => { if (!/^\\d{4}-\\d{2}-\\d{2}$/.test(v)) return false; const d = new Date(v + 'T00:00:00Z'); return !isNaN(d) && d.toISOString().slice(0, 10) === v; };\nconst seen = new Set();\nconst rows = (Array.isArray(items) ? items : []).map((r, index) => {\n  const errors = [];\n  for (const [name, f] of Object.entries(schema.fields)) {\n    const v = r?.[name];\n    const empty = v === undefined || v === null || (typeof v === 'string' && v.trim() === '') || (Array.isArray(v) && v.length === 0);\n    if (empty) { if (f.required) errors.push(`missing:${name}`); continue; }\n    const s = String(v);\n    if (f.type === 'string') { if (f.max && s.length > f.max) errors.push(`too_long:${name}`); if (f.min && s.length < f.min) errors.push(`too_short:${name}`); }\n    if (f.type === 'enum' && !f.values.includes(s)) errors.push(`not_allowed:${name}`);\n    if (f.type === 'email' && !/^[\\w.+-]+@[\\w-]+(\\.[\\w-]+)+$/.test(s)) errors.push(`bad_format:${name}`);\n    if (f.type === 'phone' && !/^0\\d{1,2}-\\d{3,4}-\\d{4}$/.test(s)) errors.push(`bad_format:${name}`);\n    if (f.type === 'date' && !isDate(s)) errors.push(`bad_format:${name}`);\n    if (f.type === 'pattern' && !new RegExp(f.pattern).test(s)) errors.push(`bad_format:${name}`);\n    if (f.type === 'list') { if (!Array.isArray(v)) errors.push(`bad_format:${name}`); else { if (f.min_items && v.length < f.min_items) errors.push(`too_few:${name}`); if (f.max_items && v.length > f.max_items) errors.push(`too_many:${name}`); } }\n  }\n  const key = String(r?.[schema.key] ?? '');\n  if (key && seen.has(key)) errors.push('duplicate_in_batch');\n  if (key) seen.add(key);\n  return { row: index + 1, key, ok: errors.length === 0, errors };\n});\nconst codes = {};\nfor (const row of rows) for (const e of row.errors) codes[e] = (codes[e] ?? 0) + 1;\nconst valid = rows.filter((r) => r.ok).length;\nreturn [{ json: { schema: schema.name, batch: body.batch ?? '', total: rows.length, valid, invalid: rows.length - valid, rows, codes } }];"
      },
      "position": [
        660,
        300
      ],
      "id": "d5d18640-aebb-5227-905c-92435b892892"
    },
    {
      "name": "Send result",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ $json }}",
        "options": {}
      },
      "position": [
        880,
        300
      ],
      "id": "3cf4a033-8e67-5be5-8392-473991da1f4d"
    }
  ],
  "connections": {
    "Check webhook": {
      "main": [
        [
          {
            "node": "Get schema",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Get schema": {
      "main": [
        [
          {
            "node": "Known schema?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Known schema?": {
      "main": [
        [
          {
            "node": "Check rows",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Unknown schema",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Check rows": {
      "main": [
        [
          {
            "node": "Send result",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  }
}