express-api-helper

Simple API helper module for Express apps.

npm install express-api-helper
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express-api-helper

Simple API helper module for Express apps.

Build Status

API

ok(req, res, data)

Respond with 200 OK and JSON-encoded data.

  • req express Request
  • res express Response
  • data Object

badRequest(req, res, errors)

Respond with 400 Bad Request and JSON-encoded error object, {message:String,errors:Array}.

  • req express Request
  • res express Response
  • data Array (of String) or String

unauthorized(req, res)

Respond with 401 Unauthorized and JSON-encoded error object, {message:String}.

  • req express Request
  • res express Response

notFound(req, res)

Respond with 404 Not Found and JSON-encoded error object, {message:String}.

  • req express Request
  • res express Response

unsupportedAction(req, res)

Respond with 405 Method Not Allowed and JSON-encoded error object, {message:String}.

  • req express Request
  • res express Response

invalid(req, res, errors)

Respond with 422 Unprocessable Entity and JSON-encoded error object, {message:String,errors:Array}.

  • req express Request
  • res express Response
  • errors Array (of String) or String

serverError(req, res, error)

Respond with 500 Internal Server Error and JSON-encoded error object, {message:String,error:Object}.

  • req express Request
  • res express Response
  • error Object

requireParams(req, res, params, callback)

Require that listed parameters are present. Checks for presence of each parameter in req.body object if using express.bodyParser middleware; otherwise checks for presence of each parameter in req.params or req.query. If any parameters are missing, invokes badRequest with an array of error messages with the form "Missing required parameter: %s".

  • req express Request
  • res express Response
  • params Array (of String) or String
  • callback(err) Function

Example

Sample usage:

var http = require('http')
  , express = require('express')
  , api = require('express-api-helper')
  , app = express()
  , Post = require('./models/post');

app.configure(function () {
  app.use(express.bodyParser());
  app.use(app.router);
});

app.all('/api/*', function (req, res, next) {
  if (!req.user) return api.unauthorized(req, res);
  next();
});

app.post('/api/posts', function (req, res) {
  api.requireParams(req, res, ['title', 'content', 'authorId'], function (err) {
    if (err) return api.serverError(req, res, err);
    var payload = {
      title: req.body.title,
      content: req.body.content,
      authorId: req.body.authorId
    };
    Post.create(payload, function (err, post) {
      if (err) return api.serverError(req, res, err);
      api.ok(req, res, post.toJSON());
    });
  });
});

app.get('/api/posts', function (req, res) {
  Post.find({}, function (err, posts) {
    if (err) return api.serverError(req, res, err);
    api.ok(req, res, posts.toJSON());
  });
});

app.get('/api/posts/:id', function (req, res) {
  Post.findById(req.params.id, function (err, post) {
    if (err) return api.serverError(req, res, err);
    if (!post) return api.notFound(req, res);
    api.ok(req, res, post.toJSON());
  })
});

http.createServer(app).listen(3000, function () {
  console.log("Express API listening on 3000");
});

Running Tests

To run the tests, clone the repository and install the dev dependencies:

git clone git://github.com/bryandragon/express-api-helper.git
cd express-api && npm install
make test

License

MIT

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