Skip to main content

​
Introduction

Struktur is a structured data extraction engine that turns pre-parsed artifacts into validated JSON using the Vercel AI SDK. It chunks content by token budgets, runs strategy-driven workflows, validates with Ajv, and merges or dedupes when needed.

​
Key features

  • Strategy-driven extraction - Choose from simple, parallel, sequential, auto-merge, or double-pass strategies
  • Token-aware batching - Automatically chunks content by token budgets with optional image limits
  • Schema-first validation - Validates results with Ajv and automatically retries on failure
  • Smart merging and deduplication - Schema-aware rules with CRC32 hashing for efficient data processing
  • Fully typed results - Uses Ajv JSONSchemaType<T> for type-safe extraction results
Struktur operates on pre-parsed artifact DTOs. It does not parse PDFs or HTML directly - it expects normalized JSON inputs.

​
Get started

Installation

Install Struktur with your preferred package manager

Quick start

Get up and running with a working extraction example

Extraction strategies

Learn about the different extraction strategies available

API reference

Explore the complete API documentation

​
How it works

Struktur follows a clear extraction pipeline: 
extract()
  -> strategy.run()
     -> batchArtifacts() / splitArtifact()
        -> prompt builder(s)
           -> runWithRetries()
              -> Ajv validation / retry
              -> merge / dedupe (strategy-specific)
  1. Input artifacts - Provide pre-parsed JSON artifacts with text and media content
  2. Select strategy - Choose an extraction strategy based on your content size and complexity
  3. Define schema - Specify the output structure using JSON Schema
  4. Extract data - Struktur chunks content, runs LLM extraction, validates results, and merges outputs
  5. Get typed results - Receive validated, type-safe extraction results
For small inputs, start with the simple strategy. For larger documents, consider parallel or sequential strategies with auto-merge capabilities.

Build docs developers (and LLMs) love

Get started for freeTalk to us