HubSpot Migration Deep Dive

Step 2: Create Custom Properties Before Import

import * as hubspot from '@hubspot/api-client';

const client = new hubspot.Client({
  accessToken: process.env.HUBSPOT_ACCESS_TOKEN!,
});

// Create custom properties that don't exist in HubSpot
async function ensureCustomProperties(objectType: string) {
  const customProps = [
    {
      name: 'source_crm_id',
      label: 'Source CRM ID',
      type: 'string',
      fieldType: 'text',
      groupName: 'contactinformation',
      description: 'Original record ID from source CRM',
    },
    {
      name: 'migration_date',
      label: 'Migration Date',
      type: 'date',
      fieldType: 'date',
      groupName: 'contactinformation',
      description: 'Date record was migrated to HubSpot',
    },
  ];

  for (const prop of customProps) {
    try {
      // POST /crm/v3/properties/{objectType}
      await client.crm.properties.coreApi.create(objectType, prop);
      console.log(`Created property: ${prop.name}`);
    } catch (error: any) {
      if (error?.body?.category === 'DUPLICATE_PROPERTY') {
        console.log(`Property already exists: ${prop.name}`);
      } else {
        throw error;
      }
    }
  }
}

Step 3: Batch Import with Progress Tracking

interface MigrationResult {
  total: number;
  created: number;
  updated: number;
  errors: Array<{ record: any; error: string }>;
  durationMs: number;
}

async function migrateContacts(
  records: Record<string, string>[],
  fieldMap: FieldMapping[]
): Promise<MigrationResult> {
  const start = Date.now();
  const result: MigrationResult = {
    total: records.length,
    created: 0,
    updated: 0,
    errors: [],
    durationMs: 0,
  };

  // Process in batches of 100 (HubSpot batch limit)
  const batchSize = 100;
  for (let i = 0; i < records.length; i += batchSize) {
    const batch = records.slice(i, i + batchSize);
    const mapped = [];

    for (const record of batch) {
      try {
        const properties = mapRecord(record, fieldMap);
        properties.migration_date = new Date().toISOString().split('T')[0];
        properties.source_crm_id = record.Id || record.id || '';
        mapped.push({ properties });
      } catch (error: any) {
        result.errors.push({ record, error: error.message });
      }
    }

    if (mapped.length === 0) continue;

    try {
      // Use batch upsert to handle existing contacts
      // POST /crm/v3/objects/contacts/batch/upsert
      const response = await client.apiRequest({
        method: 'POST',
        path: '/crm/v3/objects/contacts/batch/upsert',
        body: {
          inputs: mapped.map(m => ({
            properties: m.properties,
            idProperty: 'email',
            id: m.properties.email,
          })),
        },
      });

      const data = await response.json();
      result.created += data.results?.length || 0;
    } catch (error: any) {
      // On batch failure, try individual records
      for (const item of mapped) {
        try {
          await client.crm.contacts.basicApi.create({
            properties: item.properties,
            associations: [],
          });
          result.created++;
        } catch (err: any) {
          if (err?.body?.category === 'CONFLICT') {
            // Contact exists, update instead
            const existing = await client.crm.contacts.searchApi.doSearch({
              filterGroups: [{
                filters: [{ propertyName: 'email', operator: 'EQ', value: item.properties.email }],
              }],
              properties: ['email'], limit: 1, after: 0, sorts: [],
            });
            if (existing.results.length > 0) {
              await client.crm.contacts.basicApi.update(existing.results[0].id, {
                properties: item.properties,
              });
              result.updated++;
            }
          } else {
            result.errors.push({ record: item.properties, error: err.message });
          }
        }
      }
    }

    // Progress logging
    const progress = Math.min(i + batchSize, records.length);
    console.log(`Progress: ${progress}/${records.length} ` +
      `(${result.created} created, ${result.updated} updated, ${result.errors.length} errors)`);

    // Rate limit: max 10 requests/second
    await new Promise(r => setTimeout(r, 200));
  }

  result.durationMs = Date.now() - start;
  return result;
}

Step 4: Migrate Deals with Associations

async function migrateDeals(
  deals: any[],
  contactEmailToId: Map<string, string>
): Promise<MigrationResult> {
  const result: MigrationResult = {
    total: deals.length, created: 0, updated: 0, errors: [], durationMs: 0,
  };
  const start = Date.now();

  // Get pipeline stages
  const pipelines = await client.crm.pipelines.pipelinesApi.getAll('deals');
  const defaultPipeline = pipelines.results[0];

  for (const deal of deals) {
    try {
      const associations = [];

      // Associate with contact if we have a mapping
      if (deal.contactEmail && contactEmailToId.has(deal.contactEmail)) {
        associations.push({
          to: { id: contactEmailToId.get(deal.contactEmail)! },
          types: [{ associationCategory: 'HUBSPOT_DEFINED', associationTypeId: 3 }],
        });
      }

      await client.crm.deals.basicApi.create({
        properties: {
          dealname: deal.name,
          amount: String(deal.amount || 0),
          pipeline: defaultPipeline.id,
          dealstage: defaultPipeline.stages[0].id,
          closedate: deal.closeDate || new Date().toISOString(),
          source_crm_id: deal.id || '',
        },
        associations,
      });
      result.created++;
    } catch (error: any) {
      result.errors.push({ record: deal, error: error.message });
    }
  }

  result.durationMs = Date.now() - start;
  return result;
}

Step 5: Post-Migration Validation

async function validateMigration(
  expectedCounts: { contacts: number; deals: number }
): Promise<{ valid: boolean; checks: any[] }> {
  const checks = [];

  // Count contacts
  const contacts = await client.crm.contacts.searchApi.doSearch({
    filterGroups: [{
      filters: [{ propertyName: 'migration_date', operator: 'HAS_PROPERTY', value: '' }],
    }],
    properties: ['email'], limit: 1, after: 0, sorts: [],
  });
  checks.push({
    check: 'Contact count',
    expected: expectedCounts.contacts,
    actual: contacts.total,
    passed: contacts.total >= expectedCounts.contacts * 0.95, // 95% threshold
  });

  // Check for required fields
  const missingEmail = await client.crm.contacts.searchApi.doSearch({
    filterGroups: [{
      filters: [
        { propertyName: 'migration_date', operator: 'HAS_PROPERTY', value: '' },
        { propertyName: 'email', operator: 'NOT_HAS_PROPERTY', value: '' },
      ],
    }],
    properties: ['firstname'], limit: 1, after: 0, sorts: [],
  });
  checks.push({
    check: 'Contacts with email',
    missing: missingEmail.total,
    passed: missingEmail.total === 0,
  });

  return {
    valid: checks.every(c => c.passed),
    checks,
  };
}

Output

• Field mapping from source CRM to HubSpot properties
• Custom properties created before import
• Batch upsert with progress tracking and error recovery
• Deal migration with contact associations
• Post-migration validation with threshold checks

Error Handling

Resources

• HubSpot Import API
• Batch Operations Guide
• Custom Properties API

Next Steps

For advanced troubleshooting, see hubspot-advanced-troubleshooting.