Get env value subflow

get_env_value_subflow.json

[
    {
        "id": "75c36e89506227cf",
        "type": "subflow",
        "name": "Get env value",
        "info": "Gets the value provided for an env variable.\nIf value is prefixed with `$:` then renders it\nas a JSONata expression. Otherwise value returned\nas is.",
        "category": "",
        "in": [
            {
                "x": 40,
                "y": 40,
                "wires": [
                    {
                        "id": "70528e431a51b89b"
                    }
                ]
            }
        ],
        "out": [
            {
                "x": 400,
                "y": 40,
                "wires": [
                    {
                        "id": "70528e431a51b89b",
                        "port": 0
                    }
                ]
            },
            {
                "x": 400,
                "y": 100,
                "wires": [
                    {
                        "id": "a1f7df8ca3e7d2cc",
                        "port": 0
                    }
                ]
            }
        ],
        "env": [
            {
                "name": "name",
                "type": "str",
                "value": "",
                "ui": {
                    "icon": "font-awesome/fa-tag",
                    "label": {
                        "en-US": "Name"
                    },
                    "type": "input",
                    "opts": {
                        "types": [
                            "str"
                        ]
                    }
                }
            },
            {
                "name": "value",
                "type": "env",
                "value": "",
                "ui": {
                    "icon": "font-awesome/fa-code",
                    "label": {
                        "en-US": "Value"
                    },
                    "type": "input",
                    "opts": {
                        "types": [
                            "str",
                            "env"
                        ]
                    }
                }
            }
        ],
        "meta": {},
        "color": "#F3B567",
        "outputLabels": [
            "Success",
            "Error"
        ],
        "icon": "font-awesome/fa-code",
        "status": {
            "x": 200,
            "y": 180,
            "wires": [
                {
                    "id": "1432b856e8c55703",
                    "port": 0
                }
            ]
        }
    },
    {
        "id": "1432b856e8c55703",
        "type": "status",
        "z": "75c36e89506227cf",
        "name": "",
        "scope": null,
        "x": 80,
        "y": 180,
        "wires": [
            []
        ]
    },
    {
        "id": "70528e431a51b89b",
        "type": "function",
        "z": "75c36e89506227cf",
        "name": "Get value",
        "func": "let value = env.get(\"value\");\n\nif(typeof value == 'string' && value.startsWith('$:')){\n    value = value.substring(2);\n    let template = RED.util.prepareJSONataExpression(value, node);\n    value = RED.util.evaluateJSONataExpression(template, msg, null);\n}\n\nmsg.env = msg.env || {};\nmsg.env[env.get(\"name\")] = value;\n\nnode.status({ fill: \"green\", shape: \"dot\", text: String(value) });\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 240,
        "y": 40,
        "wires": [
            []
        ]
    },
    {
        "id": "c6edc2f950bd7f10",
        "type": "catch",
        "z": "75c36e89506227cf",
        "name": "",
        "scope": null,
        "uncaught": false,
        "x": 80,
        "y": 100,
        "wires": [
            [
                "a1f7df8ca3e7d2cc"
            ]
        ]
    },
    {
        "id": "a1f7df8ca3e7d2cc",
        "type": "function",
        "z": "75c36e89506227cf",
        "name": "Set fail status",
        "func": "const VALUE = env.get(\"value\");\nnode.status({fill:\"red\",shape:\"ring\",text:`JSONata fail: ${VALUE}`});\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 260,
        "y": 100,
        "wires": [
            []
        ]
    }
]