Jbuilder for Node.js

Purpose

Tiny Node.js port of rails' jbuilder.

Installation

$ npm i jbuilder

Usage

jbuilder#create(fn)

Returns JSON container. Call target() on the container to get the JSON representation as string.

jbuilder#encode(fn)

Same as #create(), but returns JSON string instead.

json.target()

Converts JSON container to JSON string and returns it.

var output = jbuilder.create(function(json) {
  json.set('key', 'value');
});

console.log(output.target());
// {"key":"value"}

json.set(key, value)

Sets the value for the given key.

var output = jbuilder.encode(function(json) {
  json.set('name', 'Mario');
});

console.log(output);
// {"name":"Mario"}

// Set second level values
var output = jbuilder.encode(function(json) {
  json.set('profile', function(json) {
    json.set('imagePath', '/0815.jpg');

    // Set third level values
    json.set('chuck', function(json) {
      json.set('name', 'Norris');
    });
  });
});

console.log(output);
// {"profile":{"imagePath":"/0815.jpg","chuck":{"name":"Norris"}}}

json.extract(obj, [...])

Extracts all keys for the given object. The parameter list is dynamic, but must have at least an object and one key. If the first parameter is an array, it will extract the keys from all objects within the array and add the whole result set as an array to the json container.

var product = { price: 12.99, name: 'Foo', weight: '1kg', test: 'bar' };

var output = jbuilder.encode(function(json) {
  json.set('product', function(json) {
    json.extract(product, 'price', 'name', 'weight');
  });
});

console.log(output);
// {"product":{"price":12.99,"name":"Foo","weight":"1kg"}}

// Extract values of array
var output = jbuilder.encode(function(json) {
  json.set('products', function(json) {
    json.extract([product, product], 'price', 'name', 'weight');
  });
});

console.log(output);
// {"products":[{"price":12.99,"name":"Foo","weight":"1kg"},{"price":12.99,"name":"Foo","weight":"1kg"}]}

extract also allows a function to be passed as second argument, to iterate over an array:

var users = [{ id: 1, username: 'foo' }];

var output = jbuilder.encode(function(json) {
  json.extract(users, function(json, user) {
    json.set('username', user.username);
  });
});

console.log(output);
// [{"username":"foo"}]

json.child(fn)

Adds all values set in the given callback within an array instead of a plain object. Useful in loops.

// Turns object into array
var output = jbuilder.encode(function(json) {
  json.set('orders', function(json) {
    json.child(function(json) {
      json.set('id', 1);
    });
    json.child(function(json) {
      json.set('id', 2);
    });
  });
});

console.log(output);
// {"orders":[{"id":1},{"id":2}]}

json.setIgnoreFalse(bool)

If set to true, all values that are set afterwards are ignored if they are sort of false (undefined, 0, false).

// Ignore false values
var output = jbuilder.encode(function(json) {
  json.set('admin', false); // Present
  json.setIgnoreFalse(true);
  json.set('value', false); // Not present
});

console.log(output);
// {"admin":false}

json.setConvert(fn)

Calls the given fn with the value as parameter before a value is inserted.

// Lowercase all value
var convert = function(value) {
  return value.toLowerCase();
};

var output = jbuilder.encode(function(json) {
  json.setConvert(convert);
  json.set('name', 'FOO');
  json.set('email', '[email protected]');
});

console.log(output);
// {"name":"foo","email":"[email protected]"}

License

(The MIT License)

Copyright (c) 2013 Mario Behrendt [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.