range-empty

• Status: 422 Unprocessable Entity
• Route: POST /api/v1/generate-events
• Description: range is empty: expected from to lie before to
• Details: from and to, the bounds as the request gave them.

Why It Happens#

from does not lie before to. The range is half-open, so it includes from, but not to, and a range whose bounds are the same instant is empty, too. Often, the bounds are simply swapped.

How to Fix It#

Make from lie before to.

Example#

For a range whose bounds are swapped, SynthEvents answers:

{
  "type": "error",
  "data": {
    "code": "https://docs.synthevents.io/errors/range-empty",
    "description": "range is empty: expected from to lie before to",
    "details": {
      "from": "2026-01-01T00:00:00Z",
      "to": "2025-01-01T00:00:00Z"
    }
  }
}