"NodeJS" (External Evaluation System)
Details

- Node.js Version 7.10.1 and higher is supported.
- Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.
- To configure Node.js for use in the Wolfram Language, follow the instructions from the Configure NodeJS for ExternalEvaluate workflow.
ExternalEvaluate Usage

- ExternalEvaluate["NodeJS",code] executes the code string in a Node.js REPL and returns the results as a Wolfram Language expression.
- ExternalEvaluate["NodeJS""String",code] executes the code string in a Node.js REPL and does not interpret the results.
Examples
open allclose allBasic Examples (2)
Use the File wrapper to execute code contained in a file:
Deploy code using CloudDeploy and then run the code directly from a CloudObject:
Use a URL wrapper to directly run code hosted online:
Scope (20)
Evaluate a Boolean statement in NodeJS and return it:
Concatenate strings in NodeJS and return the result:
Create an ExternalFunction with NodeJS:
Session Options (9)
"ReturnType" (3)
For NodeJS, the default return type is "Expression":
Numbers, strings, lists and associations are automatically imported for the "Expression" return type:
The return type of "String" returns a string, using JSON:
"Version" (1)
Command Options (10)
"Command" (4)
When a string is provided, the command is directly executed:
The above is equivalent to writing the command using this form:
Use a File wrapper to run the code from a file:
The above is equivalent to writing the command using this form:
Use a URL wrapper to directly run code hosted online:
The above is equivalent to writing the command using this form:
Put code in a CloudObject:
Evaluate directly from the cloud:
The above is equivalent to writing the command using this form:
"ReturnType" (1)
"Arguments" (2)
Use "Arguments" to call the command with arguments:
For a single argument, you do not need to use a list:
If you need to pass a list as the first argument, wrap it with an extra list explicitly:
You can name a function in "Command" and directly call it with "Arguments":
The same result can be archived by using a Rule:
An alternative method is to define an ExternalFunction:
"TemplateArguments" (2)
When running a command you can inline a TemplateExpression:
You can explicitly fill TemplateSlot using "TemplateArguments":
If you need to pass a list as the first argument, wrap it with an extra list explicitly:
You can name template slots and use an Association to pass named arguments to the template:
Applications (2)
Define the Range function in NodeJS: