Internal MPN Node Set

Internal Node-RED package that currently contains:

• internal-mpn-double-number
• internal-mpn-pseudo-hash

Node Type

• internal-mpn-double-number
• internal-mpn-pseudo-hash

Behavior

• Reads msg.payload
• Reads Multiplier from the node configuration
• Accepts a finite number or a numeric string
• Multiplies it by the configured multiplier
• Writes the result back to msg.payload
• Sends the message onward

Accepted examples:

• 21 with Multiplier=2 -> 42
• 21 with Multiplier=3 -> 63
• -7 with Multiplier=2 -> -14
• 2.5 with Multiplier=2 -> 5
• "21" with Multiplier=2 -> 42
• " -7 " with Multiplier=2 -> -14

Rejected examples:

• "abc"
• "12px"
• ""
• null
• true
• invalid configured multipliers such as "abc"

If msg.payload is not a finite number or numeric string, the node raises an error and does not forward the message.

If Multiplier is not a finite number, the node raises an error and does not forward the message.

Pseudo Hash

The internal-mpn-pseudo-hash node computes a deterministic non-cryptographic uppercase HEX hash from msg.payload.

Behavior:

• converts msg.payload to a string
• computes a lightweight pseudo-hash inspired by the validated JSONata prototype
• writes the resulting hash string back to msg.payload

Supported hash lengths:

• 8
• 16
• 32
• 64

Examples:

• "abc" with Hash Length=8 -> D72E2140
• "abc" with Hash Length=16 -> D72E214072DAE913
• "abc" with Hash Length=32 -> D72E214072DAE91369672A93FB4D8A8F

Important:

• this is not a cryptographic hash
• use it for deterministic internal identifiers, not for security-sensitive workflows

Palette Category

The node is registered under the custom Node-RED palette category:

• internal-mpn

Local Development

Install the published package from npm:

cd ~/.node-red
npm install @andriy-zab/node-red-contrib-double-number

Then restart Node-RED.

For local package development from this repository:

From your Node-RED user directory:

cd ~/.node-red
npm install /Projects/test-project-1/plugins/node-red-contrib-internal-mpn-double-number

If you prefer a symlink-style workflow during development:

cd ~/.node-red/node_modules/@internal-mpn
ln -s /Projects/test-project-1/plugins/node-red-contrib-internal-mpn-double-number node-red-contrib-double-number

Example Flow

Example flow:

• examples/double-number.json
• examples/pseudo-hash.json

Tests

Install dev dependencies and run:

npm test
npm run lint:flow