teeny.js

Teeny.js route system for Node.js

The main objective of this project is to be light, simple, easy to learn, to serve other projects that need a route system to use together with other libraries and mainly to explore the native resources from language and engine (Node).

Advantages of using Teeny.js

It is possible to use modules in the routes and method app.handlerCodes() and these modules are loaded only when necessary.

When you edit the file containing the routes, Teeny.js detects and updates everything on its own without having to restart the server, something that is often necessary in other similar libs. This makes it easy to quickly maintain or reconfigure anything called within routes.js.

It is possible to create your own patterns to use in route parameters.

Configure your project

Before start, Node10+ is required.

If not created a project you can create using npm init, first create a folder named blog:

mkdir blog && cd blog && npm init && npm i teeny.js

Or to install into an existing project, run:

cd project-folder
npm i teeny.js

After install you can use index.js or other and put routes in a script named routes.js (or other name), example:

// index.js

const { Teeny } = require('teeny.js');

const app = new Teeny(`${__dirname}/routes.js`, 7000);

app.exec();

The ${__dirname}/routes.js is your module with routes and configs and 7000 is the HTTP port.

The request contains http.ClientRequest object and response contains http.ServerResponse

// routes.js

module.exports = (app) => {
    app.action('GET', '/', (request, response) => {
        return 'Hello World!';
    });

    app.action('GET', '/about', (request, response) => {
        return 'About example!';
    });
};

Note: When editing anything in the routes.js file (or any file you have configured in the routesPath parameter in new Teeny(String routesPath, ...)), the application itself will detect the update and apply it, eliminating the need to restart the application. In the meantime, the server will send HTTP status 503 Service Unavailable to the client.

For start application use command:

node index.js

Methods for config Teeny.js

Method	Description
new Teeny(String routesPath, Number port)	configure routes (or others methods from class) and port
new Teeny(String routesPath, Object config)	configure routes and server config on second param (see: https://nodejs.org/api/net.html#net_server_listen_options_callback)
app.action(String|Array methods, String path, Function callback)	Define a route (from HTTP path in URL) for execute a function, arrow function or anonymous function
app.action(String|Array methods, String path, String module)	Define a route for load and execute other "local" module (it is recommended to set the absolute path)
app.handlerCodes(Array codes, Function callback)	Catch http errors (like ErrorDocument or error_page) from ISPAI or if try access a route not defined (emits 404 Not Found) or if try access a defined route with not defined http method (emits 405 Method Not Allowed)
app.handlerCodes(Array codes, String module)	Catch http errors or errors from routes, if catchs a error execute a "local" module defined in second argument
app.setDebug(Boolean enable)	Define if debug is on (true) or off (false), by default is false
app.setDefaultCharset(String charset)	Define the default charset for use with text/html (route pages, errors) or text/plain (static files)
app.setPublic(String path)	Define path for use static files
app.setPattern(String name, String regex)	Create a pattern for use in route params
app.setPattern(String name, RegExp regex)	Create a pattern using a RegExp object
app.setRequire(Function require)	Set require path for load modules using createRequire() or createRequireFromPath(). Note: this function affects the routes.js location and modules loaded by the app.action(methods, module) method
app.streamFile(path, http.ServerResponse response): Promise	Server a file
app.exec(): Promise<Object>	Starts server, promise returns server info like {address: "127.0.0.1", port: 7000} (see https://nodejs.org/api/net.html#net_server_address)
app.stop(): Promise<Object>	Stops server, promise returns server info

Patterns supported by param routes

You can create your own patterns to use with the routes in "Teeny.js", but there are also ready-to-use patterns:

Pattern	Regex used	Description
alnum	[\da-zA-Z]+	Matches routes with param using alpha-numeric in route
alpha	[a-zA-Z]+	Matches routes with param using A to Z letters in route
decimal	\d+\.\d+	Matches routes with param using decimal format (like 1.2, 3.5, 100.50) in route
num	\d+	Matches routes with param using numeric format in route
noslash	[^\/]+	Matches routes with param using any character except slashs (\/ or /) in route
nospace	\S+	Matches routes with param using any character except spaces, tabs or NUL in route
uuid	[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}	Matches routes with param using uuid format in route
version	\d+\.\d+(\.\d+(-[\da-zA-Z]+(\.[\da-zA-Z]+)*(\+[\da-zA-Z]+(\.[\da-zA-Z]+)*)?)?)?	Matches routes with param using semver.org format in route

For use a pattern in routes, set like this:

module.exports = (app) => {
    app.action('GET', '/user/<name:alnum>', (request, response, params) => {
        return `Hello ${params.alnum}`;
    });

    app.action('GET', '/api/<foobar:version>', (request, response, params) => {
        return `Version: ${params.foobar}`;
    });

    app.action('GET', '/product/<id:num>', (request, response, params) => {
        return `Product ID: ${params.id}`;
    });
...

Debug mode

Uses app.setDebug(...); method for enable or disable debug mode (false by default), example:

module.exports = (app) => {
    // Enable debug
    app.setDebug(true);

    app.action('GET', '/', (request, response) => {
        return 'Hello World!';
    });

    ...

Delivering responses

In the third parameter (callback) you can send the response to the client in two ways, using return passing a value that can be converted into a string (Promises that return values are also supported):

module.exports = (app) => {
    app.action('GET', '/', (request, response) => {
        return 'Hello!'
    });

    ...

Or you can use the second parameter (response) received in the callback, this way you can work with other functions that use callback (eg.: setTimeout), for example:

module.exports = (app) => {
    app.action('GET', '/', (request, response) => {
        setTimeout(() => response.end('Hello!'), 1000);
    });

    ...

In the case of return, if you are using arrowfunction and it does not execute anything other than the return, you can pass the value directly, for example:

module.exports = (app) => {
    app.action('GET', '/', (request, response) => 'Hello!');

    ...

Handler errors

To get errors occurring in the application, detect undefined routes and detect method HTTP method not allowed for a route:

module.exports = (app) => {
    app.handlerCodes([404, 500], (request, response, status, error) => {
        // Create a custom page for 404 and 500 status
        return `Error page: ${status}`;
    });
    ...

To save errors to a log (an example for send to Slack):

const { WebClient } = require('@slack/web-api');

const token = ...;
const conversationId = ...;

module.exports = (app) => {
    app.handlerCodes([404, 500], (request, response, status, error) => {
        if (status === 500) {
            web.chat.postMessage({
                text: `${request.method} ${request.url}\n${error.toString()}`,
                channel,
            });
        }

        return `Error page: ${status}`;
    });
    ...

Note: See example

Send big files for HTTP response

When loading in a variable directly all the contents of a file to send with "return" in the response of a route may crash the application or even the server, instead of reading the entire file you must make use of what already exists in Node , the "pipe" of streams. An example to send files of different sizes to download in the HTTP response:

app.action('GET', '/foo/bar/download', (request, response) => {
    const file = '/home/user/foo/bar/storage/big.file';

    app.streamFile(file, response).then(() => {
        console.log('Streamed');
    }).catch((ee) => {
        console.error(ee);
    });
});

Example with custom headers:

app.action('GET', '/foo/bar/download', (request, response) => {
    const file = '/home/user/foo/bar/storage/big.file';

    app.streamFile(file, response, {
        'Content-Type': 'application/octet-stream',
        'X-Foo': 'bar'
    }).then(() => {
        console.log('Streamed');
    }).catch((ee) => {
        console.error(ee);
    });
});

Return response

Callback supports string, Buffer and Uint8Array

app.action('GET', '/string', () => {
    return 'My string';
});

app.action('GET', '/buffer', () => {
    return Buffer.alloc(25, 'aGVsbG8gd29ybGQgKGZyb20gYnVmZmVyKQ==', 'base64');
});

app.action('GET', '/uint8array', () => {
    return new Uint8Array([
      102, 114, 111, 109, 32,
      85,  105, 110, 116, 56,
      65,  114, 114, 97, 121
    ]);
});

Require module with routes

You can set up a require function in the context of routes to load modules via routes

If you want to configure from the script called do:

const app = new Teeny('./routes.js', 7000);

app.setRequire(require);

You can also configure it in the routes file, that way if you need to edit the file and change the require it will not be necessary to restart the application:

module.exports = (app) => {
    // (Optional) Define require function for load modules in router context for load
    app.setRequire(require);

    app.action('GET', '/', './module.js');

...

If you want to customize the path you can use module.createRequire (v12.2.0+).

Set require function in Node.js v12.2.0+

Defines a custom path from which to locate your modules using module.createRequire:

const { createRequire } = require('module');

module.exports = (app) => {
    app.setRequire(createRequire('/foo/bar/baz/.'));

    app.action('GET', '/', './module.js');

...

Set require function in old Node.js versions

Defines a custom path from which to locate your modules using module.createRequireFromPath (deprecated):

const { createRequireFromPath } = require('module');

module.exports = (app) => {
    app.setRequire(createRequireFromPath('/foo/bar/baz/.'));

    app.action('GET', '/', './module.js');

...