Sample data

To preview a template you provide sample data — a JSON object whose keys match the Liquid placeholders in your template.

The data panel

Open the Data panel on the left of the editor and paste a JSON object:

{
  "customer": { "name": "Acme Corp", "vip": true },
  "invoice": {
    "date": "2026-01-15",
    "total": 1250,
    "lines": [
      { "label": "Consulting", "amount": 1000 },
      { "label": "Support",    "amount": 250 }
    ]
  }
}

The preview re-renders live as you edit either the template or the data. If the data has a Liquid error, the last valid preview stays on screen so the page never blanks out mid-edit.

Saved sample data

You can save a data set under a name and reload it later. When saved samples exist, a dropdown appears above the data textarea to load one, with a × to delete it. This is handy for testing a template against several realistic scenarios (small invoice, large invoice, edge cases…).

Pushing demo data from your systems

You can also create sample data programmatically — useful to capture a real payload from your application and replay it in the editor. Send your JSON to the demo-data endpoint with an API key:

curl -X POST https://api.generatr.app/v1/demo-data/{slug} \
  -H "Authorization: Bearer wt_your_key" \
  -H "Content-Type: application/json" \
  -d '{ "customer": { "name": "Acme Corp" } }'

The payload is saved as a named sample (auto-named {slug}-YYYY-MM-DD-HHmm) and becomes available in the editor's sample dropdown.