lien

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> An easy to use web framework for Node.js.

:cloud: Installation

``sh


Using npm

npm install --save lien

Using yarn

yarn add lien
`

:clipboard: Example

`js
const Lien = require("lien");

// Init lien server
const server = new Lien({
port: 9000
, public: ${__dirname}/public
});

// Listen for load
server.on("load", err => {
console.log(err || "Server started on port 9000.");
err && process.exit(1);
});

// Add page
server.get("/", lien => {
lien.end("Hello World");
});

// Add a dynamic route
server.get("/post/:id", lien => {
lien.end("Post id: " + lien.params.id);
});

// Add a static file
server.get("/test", "index.html");

// Listen for server errors
server.on("serverError", err => {
console.log(err.stack);
});
`

:question: Get Help

There are few ways to get help:

1. Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.
2. For bug reports and feature requests, open issues. :bug:
3. For direct and quick help, you can use Codementor. :rocket:

:memo: Documentation




$3


Creates the lien object.

#### Params

- Object req: The request object.
- Object res: The response object.
- Function next: The next middleware function.
- Object server: The Lien server instance.

#### Return
- Lien The lien object.

$3

Go to the next middleware handler.

#### Return
- Lien The Lien instance.

$3

Redirects the client to another url.

#### Params

- String newUrl: The new url to redirect to.
- Boolean|Object query: If true, the request querystring parameters will be appended. If it's an object, it will be merged with the request querystring parameters.

$3

Renders a template to the client.

#### Params

- String template: The template name.
- Object data: The template data.

$3

Starts a session.

#### Params

- Object data: The session data.

$3

Sets the session data.

#### Params

- Object data: The session data.

$3

Returns the session data object/specific field.

#### Params

- Field field: A specific field to get from the session object.

#### Return
- Value|Object The field value. If a field is not specified, the whole session data object is returned.

$3

Destroys the session.

$3

Gets/sets/deletes headers.

#### Params

- String name: The header name.
- String value: The header value to set. If null, the header will be removed.

#### Return
- Lien The Lien instance.

$3


Sends to the client a JSON object containing the message field.

#### Params

- String msg: The API message.
- Number status: The status code (default: 200).

$3


Like apiMsg, but by default with a status code of 422.

#### Params

- String msg: The API message.
- Number status: The status code (default: 422).

$3

Ends the response sending the content.

#### Params

- Anything content: The content that should be sent to the response.
- Number status: The status code.
- String contentType: The content type (e.g. "json").
- Object headers: Additional headers to send in the response.

$3

Sets, gets or deletes the cookie.

#### Params

- String cookie: The searched cookie.
- String value: If provided and it not null, the cookie will be set. If it's null, the cookie will be deleted. If value is not provided, the cookie value will be returned.

#### Return
- String|null|undefined null, if the cookie was deleted. undefined if the cookie doesn't exist. The cookie value if this exists.

$3

Serves a file to the response.

#### Params

- String path: Relative path to the file.
- String customRoot: Absolute path to the root directory (optional).

$3

Creates a new Lien instance.

It extends the EventEmitter class.

It emits the following events:

- load (err): After the server is started. If there are no errors, the err will be null.
- serverError (err, req, res): This is emitted when something goes wrong after the server is started.
- error (err): Errors which may appear during the server initialization.

#### Params

- Object opt_options: An object containing the following properties:
- host (String): The server host.
- port (Integer): The server port. process.env.PORT is used, default is 3000.
- session (Boolean|Object): Enable the session support. If it's an object, it will be merged with the following defaults and passed to express-session:
- secret (String): This is the secret used to sign the session ID cookie (default: "lien server").
- resave (Boolean): Forces the session to be saved back to the session store, even if the session was never modified during the request (default: false).
- saveUninitialized (Boolean): Forces a session that is "uninitialized" to be saved to the store (default: true).
- cookie (Object): The cookie options.
- storeOptions (Object): The session store options. These options are passed to the session store you choose.
- store: (String|Function): The session store name or function. By default it's using a memory store if the session is enabled.
- public (String|Array): The path to the public directory or an array of arrays in this format: ["/url/of/static/dir", "path/to/static/dir"].

Example:

`js
[
["/images", "path/to/images"]
, ["/", "path/to/public"]
]
`

- ssl (Object): An object containing the following fields:
- key (String): The path to the key file.
- cert (String): The path to the cert file.
- _key (String|Buffer): The key file content (defaults to the key file content).
- _cert (String|Buffer): The cert file content (defaults to the cert file content).

- views
- path (String): The path to the views directory.
- name (String): The view engine name.

- errorPages (Object):
- notFound (String|Function): The path to a custom 404 page or a function receiving the lien object as parameter. This can be used to serve custom 404 pages.
- serverError (String|Function): The path to a custom 500 page or a function receiving the lien object as parameter. This can be used to serve custom 500 pages.
- badCsrf (String|Function): The path to a custom bad CSRF page or a function receiving the lien object as parameter. This can be used to serve custom bad CSRF errors.

- logErrors (Boolean): Log the server errors (default: true).
- csrf (Object): The CSRF options. These are passed to csurf
- bodyParserJson (Boolean): Whether to enable the JSON body parser (default: true)
- bodyParserUrlEncoded (Boolean): Whether to enable the URL encoded body parser (default: true)
- cookieParser (Boolean): Whether to enable the cookie parser (default: true)
- transformers (Boolean): Whether to enable the transformers (default: true)

#### Return
- Object The Lien instance.

$3

Adds a new static path to the server.

#### Params

- String url: The static path url endpoint.
- String localPath: The local path to the directory.

$3

Adds a new page to be handled.

#### Params

- String url: The page url.
- String|Object method: The request methods to be handled (default: "all") or an object:
- method (String): The HTTP method.
- before (Array|Function): A function or an array of middleware functions to be executed before the main function.
- after (Array|Function): A function or an array of middleware functions to be executed after the main function.
- Function output: A function receiving the lien object as parameter. If can be a path serving a public file.

$3

Handle the error pages.

#### Params

- Object options: An object containing the following fields:
- notFound (String|Function): The path to a custom 404 page or a function receiving the lien object as parameter. This can be used to serve custom 404 pages.
- serverError (String|Function): The path to a custom 500 page or a function receiving the lien object as parameter. This can be used to serve custom 500 pages.

$3

Gets the transformer for a url.

#### Params

- String type: The hook type (before or after).
- String url: The url.
- String method: The method.

#### Return
- Transformer|null The transformer (if it exists) or null.

$3


Similar to getHooks, but doesn't concat hooks based on the regex
matching but only if they are the same regex.

#### Params

- String type: The hook type (before or after).
- String url: The url.
- String method: The method.

#### Return
- Transformer|null The transformer (if it exists) or null.

$3

Inserts a new hook.

#### Params

- String type: The hook type (before, after, custom:name).
- String url: The url.
- String method: The method.
- Transformer trans: The transformer to insert.

#### Return
- Transformer The inserted transformer.

$3

Adds a new hook.

#### Params

- String where: The hook type (before or after).
- String url: The route url.
- String method: The HTTP method.
- Function cb: The callback function.
- Number transType: The transformer type.

$3


Adds a before hook. It will handle all the subroutes of the url.

#### Params

- String url: The route url.
- String method: The HTTP method.
- Function cb: The callback function.
- Number transType: The transformer type.

$3


Adds a before hook. It will handle all the subroutes of the url.

#### Params

- String url: The route url.
- String method: The HTTP method.
- Function cb: The callback function.
- Number transType: The transformer type.

$3

Use this function to add middleware handlers.

#### Params

- String url: The route url.
- String method: The HTTP method.
- Function cb: The callback function.
- Number transType: The transformer type.

$3

Adds a new middleware. Note: This will not trigger the hooks.

#### Params

- String url: The endpoint url.
- String method: The HTTP method (default: all).
- Function cb: The callback function.




:yum: How to contribute

Have an idea? Found a bug? See [how to contribute][contributing].

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this takes time. You can integrate and use these projects in your applications for free! You can even change the source code and redistribute (even resell it).

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Thanks! :heart:




:dizzy: Where is this library used?

If you are using this library in one of your projects, add it in this list. :sparkles:

- @dottjt/mediareade
- @everything-registry/sub-chunk-2069
- bloggify
- bloggify-cli
- bloggify-prebuilt
- bloggify-server-prebuilt
- bnotify
- chewb-youtube-uploader
- fb-token-updater
- gh-contributions
- learning-node-file-upload
- learning-nodejs-file-upload
- lien-github-comments-example
- nodejs-youtube-uploader
- test-youtube-api
- web-term
- wrabbit
- youtube-album-uploader
- youtube-album-uploader-multiple`

:scroll: License

[MIT][license] © [Ionică Bizău][website]

[license]: /LICENSE
[website]: https://ionicabizau.net/
[contributing]: /CONTRIBUTING.md
[docs]: /DOCUMENTATION.md
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[badge_amazon]: https://ionicabizau.github.io/badges/amazon.svg
[badge_paypal]: https://ionicabizau.github.io/badges/paypal.svg
[badge_paypal_donate]: https://ionicabizau.github.io/badges/paypal_donate.svg
[patreon]: https://www.patreon.com/ionicabizau
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[paypal-donations]: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RVXDDLKKLQRJW