Structured data in, clean data out
Accept files from users, auto-map columns to your schema, validate every row, and deliver clean, structured data to your systems, all in minutes.
Everything you need for reliable data ingestion
From file upload to validated output, MassImporter handles the entire pipeline so your team can focus on what matters.
Large File Upload
Direct-to-storage multipart uploads handle files over 100 MB. CSV and XLSX supported out of the box.
Automatic Column Mapping
Source columns whose names match your schema are mapped for you. Review every match and change any column before validating.
Validation Engine
17 built-in constraint types, with ready-made pattern presets for formats like email and phone. Every row validated before delivery.
Public API & Webhooks
RESTful API with Bearer token auth. Receive HMAC-signed webhook events for every import lifecycle change.
Three steps to clean data
Define your schema once, then process files in minutes with automatic validation and error reporting.
Define Template
Create a reusable template with sheets, fields, data types, and validation constraints. Publish when ready.
Upload & Map
Drag and drop your file. Columns are auto-mapped to your schema. Review and adjust mappings as needed.
Validate & Import
Every row is validated asynchronously. Preview results, fix errors in bulk, then import with one click.
The same pipeline, wherever your users are
Run files through the MassImporter dashboard yourself, or embed the same upload and review experience directly inside your own application.
Ready to streamline your data pipeline?
Create your free account and start processing data in under five minutes. No credit card required.