A library for building REST APIs easily with Dart

A library for building REST APIs easily with Dart modeled after Express JS for Node Js.

The library is still a work in progress and open to contribution.

Created with StageHand – license.

Inspiration

Our inspiration is the simplicity of express js .

Installing

Add the following to your pubspec.yaml file:

dependencies:
  sevr: any

Usage

A simple usage example:

import 'dart:io';

import 'package:sevr/sevr.dart';
import 'package:path/path.dart' as p;

main() {
  var serv = Sevr();

  //let sevr know to serve from the /web directory
  serv.use(Sevr.static('example/web'));

  //Use path to get directory of the files to serve on that route
  serv.get('/serve', [
    (ServRequest req, ServResponse res) {
      return res.status(200).sendFile(p.absolute('example/web/index.html'));
    }
  ]);

  //get request
  serv.get('/test', [
    (ServRequest req, ServResponse res) {
      return res.status(200).json({'status': 'ok'});
    }
  ]);

  //post request
  serv.post('/post', [
    (ServRequest req, ServResponse res) async {
      return res.status(200).json(req.body);
    }
  ]);

  // request parameters
  serv.get('/param/:username', [
    (ServRequest req, ServResponse res) {
      return res.status(200).json({'params': req.params});
    }
  ]);

  // query parameters
  serv.get('/query', [
    (ServRequest req, ServResponse res) {
      return res.status(200).json(req.query);
    }
  ]);

  //Upload Files
  serv.get('/upload', [
    (req, res) async {
      for (var i = 0; i < req.files.keys.length; i++) {
        //Handle your file stream as you see fit, write to file, pipe to a cdn etc --->
        var file = File(req.files[req.files.keys.toList()[i]].filename);
        await for (var data
            in req.files[req.files.keys.toList()[i]].streamController.stream) {
          if (data is String) {
            await file.writeAsString(data, mode: FileMode.append);
          } else {
            await file.writeAsBytes(data, mode: FileMode.append);
          }
        }
      }

      return res.status(200).json(req.body);
    }
  ]);

  //Bind server to port 4000
  serv.listen(4000, callback: () {
    print('Listening on port: ${4000}');
  });
}

Create Server Connection

Pass in the port of your choice in this case: 4000

serv.listen(4000, callback: () {
    print('Listening on port: ${4000}');
  });

Make Server Requests

• Create requests by passing in the desired route.
• Put route Controllers in a List of Functions (ServRequest is a helper class that binds to HttpRequest, while ServResponse binds to the response from the HttpRequest Stream).
• Set response status res.status().

Other available request types:

• PUT
• PATCH
• DELETE
• COPY
• HEAD
• OPTIONS
• LINK
• UNLINK
• PURGE
• LOCK
• UNLOCK
• PROFIND
• VIEW

serv.get('/test', [
    (ServRequest req, ServResponse res) {
      return res.status(200).json({'status': 'ok'});
    }
  ]);

  serv.post('/post', [
    (ServRequest req, ServResponse res) async {
      return res.status(200).json(req.body);
    }
  ]);

Serve Files From Your Server

• First Let Sevr know where you want to serve the files from with use() .
• Here we used the .absolute() function from the path package, pass in the directory of your main file, in this case index.html.

  //let sevr know to serve from the /web directory
  serv.use(Sevr.static('example/web'));

  //Use path to get directory of the files to serve on that route
  serv.get('/serve', [
    (ServRequest req, ServResponse res) {
      return res.status(200).sendFile(p.absolute('example/web/index.html'));
    }
  ]);

Features and bugs

Please file feature requests and bugs at the issue tracker.

Download REST API for Dart source code on GitHub

https://github.com/a-oboh/dart-sevr