Flexter Review: Automated ETL that converts complex XML and JSON…

Flexter

Automated ETL that converts complex XML and JSON into database-ready tables

Developer Tools Data Warehousing AI Data & Analytics sonra.io

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About Flexter

Flexter by Sonra is a no-code, fully automated ETL tool purpose-built for XML and JSON data. It automatically detects schemas, maps complex nested structures, and outputs clean relational tables to databases or data lakes — with no manual coding or ETL development required. Unlike general-purpose ETL platforms that treat XML as an afterthought, Flexter is specifically engineered for industry-standard XML formats like FpML, HL7, and clinical trial data. The tool supports a wide range of output targets including Snowflake, BigQuery, SQL Server, Oracle, Redshift, and flat file formats like Parquet, ORC, Avro, and CSV. Flexter handles parallel processing at scale and is reported to process data up to 800 times faster than competing XML solutions. It is available both as an on-premise installation and as a SaaS deployment with a RESTful API. Flexter is used by data engineering and analytics teams in financial services, healthcare, and enterprise environments where XML-heavy industry standards create data pipeline bottlenecks. It is developed by Sonra, a data engineering consultancy based in Ireland.

Pros & Cons

Pros

Purpose-built for XML/JSON — far more capable than generic ETL tools for complex schemas
Fully automated with no coding or schema mapping required
Reported 800x faster processing than competing XML solutions
Supports all major cloud data warehouses and big data formats

Cons

Key Features

Automated Schema Detection

Automatically infers the schema of any XML or JSON file with no manual mapping required

No-Code ETL

Converts XML/JSON to relational tables without writing code, scripts, or ETL configurations

Multi-Target Output

Loads data directly into Snowflake, BigQuery, SQL Server, Oracle, Redshift, and other databases

Big Data Format Support

Outputs to flat file formats including Parquet, ORC, Avro, CSV, and TSV for data lake use

Parallel Processing

Handles high-volume XML/JSON workloads with parallel processing for enterprise-scale throughput

RESTful API

SaaS deployment exposes a REST API for integrating Flexter into data pipelines programmatically

Industry Standard XML Support

Purpose-built support for FpML, HL7, clinical trial XML, and other complex industry formats

Pricing