Tutorials

Hands-on lessons for learning Mapper by doing. Each tutorial builds something that works, and each builds on the one before it:

1. Your first mapping: install, reshape a record, and let the mapping validate its own output.
2. Mapping collections: fan out over arrays with each, pick elements with find, and see why pairing order matters.
3. Extending the mapper: put your own transformers and async plugins in the pipeline.
4. Catching mistakes before they run: find a broken mapping’s problems with validation, then gate evaluation on a clean report.
5. Your first mapping server: run the mapper-http image, serve your own mapping, and check documents against the live server.

Every code sample in these lessons is executed against the published engine by the site’s test suite.