Copy the current QGIS Canvas Extent to the clipboard as a 2D JSON Envelope for ArcGIS REST Service Queries

Qgis2dJsonEnvelope.py

from qgis.gui import QgsMessageBar
from qgis.PyQt.Qt import QApplication

import json

crs = QgsProject.instance().crs()
extent = iface.mapCanvas().extent()

envelope = {
    "xmin": extent.xMinimum(),
    "ymin": extent.yMinimum(),
    "xmax": extent.xMaximum(),
    "ymax": extent.yMaximum(),
    "spatialReference": {
        "wkid": crs.postgisSrid()
    }
}

QApplication.clipboard().setText(json.dumps(envelope, indent=2))

iface.messageBar().pushMessage("Copied", "2D JSON Envelope copied to clipboard", Qgis.MessageLevel.Info)