Extraction Templates

Templates define the fields you want to extract from a document type. DokuBrain includes 12+ built-in templates, and you can create custom ones for any document type.

Built-in templates

DokuBrain ships with templates for common document types. Use them directly by referencing their ID:

Template ID	Document type	Key fields
`invoice`	Invoices	vendor, number, date, amounts, line items
`contract`	Contracts	parties, dates, clauses, obligations
`receipt`	Receipts	merchant, date, total, items
`bank_statement`	Bank statements	account, period, balance, transactions
`tax_return`	Tax returns	filer, year, income, deductions
`pay_stub`	Pay stubs	employee, employer, earnings, deductions
`employment_letter`	Employment letters	employee, position, salary, dates
`nda`	NDAs	parties, term, scope, exceptions
`purchase_order`	Purchase orders	buyer, seller, items, delivery
`insurance_policy`	Insurance	policyholder, coverage, premium, limits
`utility_bill`	Utility bills	provider, account, period, amount
`government_id`	Government IDs	name, number, dates, issuer

Creating a custom template

Define a custom extraction schema for your document type:

Create a custom template

curl -X POST https://api.dokubrain.com/api/v1/templates \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Lease Agreement",
    "description": "Extract fields from commercial lease agreements",
    "fields": [
      { "name": "landlord", "type": "string", "description": "Name of the landlord/lessor" },
      { "name": "tenant", "type": "string", "description": "Name of the tenant/lessee" },
      { "name": "property_address", "type": "string", "description": "Full address of the leased property" },
      { "name": "monthly_rent", "type": "number", "description": "Monthly rent amount" },
      { "name": "lease_start", "type": "date", "description": "Lease commencement date" },
      { "name": "lease_end", "type": "date", "description": "Lease expiration date" },
      { "name": "security_deposit", "type": "number", "description": "Security deposit amount" },
      { "name": "renewal_terms", "type": "string", "description": "Renewal or extension terms" }
    ]
  }'

Field types

Type	Description	Example
`string`	Free-form text	`"Acme Corp"`
`number`	Numeric value	`1250.00`
`date`	Date value	`"2026-03-15"`
`boolean`	True/false	`true`
`array`	List of values	`["item1", "item2"]`
`object`	Nested fields	`{ "name": "...", "amount": 100 }`

Using custom templates

Once created, use your template ID when extracting:

curl -X POST https://api.dokubrain.com/api/v1/documents/doc_abc123/extract \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "templateId": "tmpl_custom123" }'

Extraction Templates

Extraction Templates

Built-in templates

Creating a custom template

Field types

Using custom templates

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