@patricktobias86/node-red-contrib-mapper 0.0.6
Map the contents of a message property from one value to another, supporting multiple mapped values and regular expressions.
node-red-contrib-mapper
A [Node-RED] node that maps the contents of a message property from one value to another, supporting multiple mapped values and regular expressions.
The message property is compared against each configured rule: you can match several values (comma-separated) or apply regex patterns (by selecting type re). If there’s a match, it changes to the specified replacement value.
By default, the msg.payload is the property that is operated on, but this can be changed to any other property, such as msg.topic.
If the message does not match any of the configured mappings, it can either be ignored or passed through unmodified.
Install
Run the following command in the root directory of your Node-RED install
npm install @patricktobias86/node-red-contrib-mapper
Usage Examples
✅ Multiple values in one rule
You can map several values to a single replacement by entering them comma-separated, for example:
- Search:
apple, banana, orange→ Replace:fruit
✅ Regex matching
You can use regex patterns by selecting the re type for the search field:
- Search:
^error_\\d+(type:re) → Replace:general_error
✅ Combining rules
You can combine plain and regex rules:
- Rule 1:
yes, y, true→confirmed - Rule 2:
^no_.*(type:re) →rejected
💡 Tip: For regex, write one pattern per rule and select the re type.
