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JSON to Elm Record

JSON Tools

Convert a JSON sample into a reviewable Elm data model.

Parameters
Input
Output
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Use cases

When to use JSON to Elm Record

Convert a JSON sample into a reviewable Elm data model.

1Bootstrap a Elm model from an API response
2Create an initial type for a webhook or configuration payload
3Compare generated Elm fields with an existing domain model
4Compare JSON structures across development, staging, and production APIs
5Prepare reproducible JSON payloads for API documentation, bug reports, or test cases
6Generate Schemas, language models, Excel workbooks, or Postman requests from JSON samples
7Review duplicate keys, nulls, field types, and contract changes before release

Guidance

Get reliable results

  1. 1Use a representative JSON sample with every important field
  2. 2Review nullability, unions and business types in the generated Elm model
  3. 3Rename generated types and fields to match project conventions
The generator infers Elm structure from observed JSON values and cannot infer business enums, runtime validation or fields missing from the sample.

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