OpenFaaS Node.js 8 and Express.js template

This template provides additional context and control over the HTTP response from your function.

Status of the template

This template is pre-release and is likely to change - please provide feedback via https://github.com/openfaas/faas

The template makes use of the OpenFaaS incubator project of-watchdog.

See also: node10-express template

Supported platforms

• x86_64 - node8-express
• armhf - node8-express-armhf

Trying the template

$ faas template pull https://github.com/openfaas-incubator/node8-express-template
$ faas new --lang node8-express

Example usage

Example with success and JSON body:

"use strict"

module.exports = (event, context) => {
    let err;
    const result =             {
        status: "You said: " + JSON.stringify(event.body)
    };

    context.
        succeed(result);
}

Example of a custom HTTP status code:

"use strict"

module.exports = (event, context) => {
    let err;
    const result = {"message": "The record requested was not found."};

    context
        .status(404)
        .succeed(result);
}

Example of failure and plain-text body:

"use strict"

module.exports = (event, context) => {
    let err;
    const result = "Unable to process this event.";

    context
        .fail(result);
}

Example with use of optional callback parameter:

"use strict"

module.exports = (event, context, callback) => {
    let err;

    callback(err, {"result": "message received"});
}

Example with redirect (setting Location header):

"use strict"

module.exports = (event, context) => {
  context
    .headers({'Location': 'https://www.google.com/'})
    .status(307)    // Temporary
    .succeed('Page has moved.')
}

Other reference:

• .status(code) - overrides the status code used by fail, or succeed
• .fail(object) - returns a 500 error if .status(code) was not called prior to that
• .succeed(object) - returns a 200 code if .status(code) was not called prior to that