Application Programming Interface (API) Design discusses best practises for creating libraries intended for general purpose or public use.

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60
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What is an Anti-Corruption layer, and how is it used?

I'm trying to figure out what the Anti-Corruption layer really means. I know that it's a way to transition/work around legacy code or bad APIs. What I don't understand is how it works and what makes ...
41
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6answers
4k views

How necessary is it to follow defensive programming practices for code that will never be made publicly available?

I'm writing a Java implementation of a card game, so I created a special type of Collection I'm calling a Zone. All modification methods of Java's Collection are unsupported, but there's a method in ...
35
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3answers
6k views

What's so bad about the DOM?

I keep hearing people (Crockford in particular) saying the DOM is a terrible API, but not really justifying this statement. Apart from cross-browser inconsistencies, what are some reasons why the DOM ...
28
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11answers
8k views

RESTful API design. What should I return if there are no rows?

I'm currently coding an API for a social network with the Slim Framework. My question is: What are the best practices when there are no rows to return in the json structure? Lets say that this call ...
23
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10answers
2k views

API design: concrete vs. abstract approach - best practices?

When discussing APIs between systems (on the business level) there are often two different point of views in our team: some people prefer a more - lets say - generic abstract approach, other a ...
22
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3answers
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RESTful API: HTTP verbs with shared or specific URLs?

While creating a RESTful API, should I use HTTP Verbs on the same URL (when it's possible) or should I create an specific URL per action? For example: GET /items # Read all items GET ...
22
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4answers
1k views

When creating an api should I stick with small functions and many calls, or a few calls and large functions?

I have a rails platform that I maintain. It has a lot of different web applications built on top of it. However now a client is asking for an API so that they can keep users on their site, but take ...
20
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2answers
2k views

Should one always know what an API is doing just by looking at the code?

Recently I have been developing my own API and with that invested interest in API design I have been keenly interested how I can improve my API design. One aspect that has come up a couple times is ...
20
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5answers
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How do searches fit into a RESTful interface?

When designing a RESTful interface, the semantics of the request types are deemed vital to the design. GET - List collection or retrieve element PUT - Replace collection or element POST - Create ...
19
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8answers
1k views

“Public APIs are forever: Only one chance to get it right”?

In an OS book I just read that, "Public APIs are forever: Only one chance to get it right". Is it true? Is it applicable only in APIs of Operating Systems or other APIs too? For example, will this be ...
17
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8answers
44k views

Why does java.util.ArrayList allow to add null?

I wonder why java.util.ArrayList allows to add null. Is there any case where I would want to add null to an ArrayList? I am asking this question because in a project we had a bug where some code was ...
16
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3answers
906 views

Detecting IEnumerable “State Machines”

I just read an interesting article called Getting too cute with c# yield return It made me wonder what the best way is to detect whether an IEnumerable is an actual enumerable collection, or if it's ...
16
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4answers
466 views

Database abstraction — is it being overdone?

After being exposed to numerous database abstraction layers, I'm starting to wonder what the point is of every library inventing their own different paradigm to access data. Picking up a new DAL feels ...
15
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4answers
2k views

Why doesn't Java String have static string manipulation methods?

Why didn't Java designers create static versions of string manipulation methods in the java.lang.String class? The following methods are what I refer to, but the question can be extended to other ...
15
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3answers
8k views

Is there a list of common usernames to reserve in a new system?

I need to reserve usernames in my new website. These generally fall into three categories 1) usernames no-one should have (eg: admin, user, service, help, root, etc) 2) names of super famous people ...
14
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4answers
4k views

Why does the Java collections APIs not have a last method? [closed]

This is for ordered collections e.g. java.util.List. Why did the language designers not include a last method? The only reasons I can think of are: ambiguity when the collection is empty (return ...
13
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5answers
655 views

In API design, when to use/avoid ad hoc polymorphism?

Sue is designing a JavaScript library, Magician.js. Its linchpin is a function which pulls a Rabbit out of the argument passed. She knows its users may want to pull a rabbit out of a String, a ...
10
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2answers
5k views

Implementing the command pattern in a RESTful API

I'm in the process of designing an HTTP API, hopefully making it as RESTful as possible. There are some actions which functionality spreads over a few resources, and sometime needs to be undone. I ...
10
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2answers
323 views

Is the 'Law of Demeter' applicable to public/API method signatures?

Given that changes to the API/public method signature should be minimal to prevent breaking those client codes that use these methods, I was wondering if the Law of Demeter is less applicable to ...
9
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2answers
2k views

Should I make up my own HTTP status codes? (a la Twitter 420: Enhance Your Calm)

I'm currently implementing an HTTP API, my first ever. I've been spending a lot of time looking at the Wikipedia page for HTTP status codes, because I'm determined to implement the right codes for ...
9
votes
5answers
6k views

How best do you represent a bi-directional sync in a REST api?

Assuming a system where there's a Web Application with a resource, and a reference to a remote application with another similar resource, how do you represent a bi-directional sync action which ...
8
votes
6answers
1k views

Should an Http API always return a body?

Is there some sort of standard regarding http api responses? After reading this discourse thread I started to wonder. We are developing our public http json api at my work, and we do not return ...
8
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3answers
4k views

Is it OK to return HTML from a JSON API?

On my current project I am responsible for the implementation of a service which involves the consumption of newly created RESTful APIs, documented as solely supporting JSON. The client consistently ...
8
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2answers
607 views

Is implementing an interface defined in a subpackage an anti-pattern?

Let's say I have the following: package me.my.pkg; public interface Something { /* ... couple of methods go here ... */ } and: package me.my; import me.my.pkg.Something; public class SomeClass ...
8
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2answers
221 views

As an API-user, would you tolerate BestPractice Exceptions?

I'm in the process of designing an API, part of which involves writing POCOs to a database. In C#, we have the DateTime structure. The "default" value for this (DateTime.MinValue) is 01/01/0001. ...
8
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1answer
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What is the proper way of nesting resources in REST model?

I'm designing a REST API of service and got stuck on proper way to nest resources. Resources: partners, tickets, settings Connections between resources: partner has many tickets, partner has set ...
8
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1answer
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When to use nested resources in a RESTful API

I have two resources: users and links. Users can have several links associated with them. I have designed my RESTful API so that you can reach the links associated with a user at the following URI: ...
8
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1answer
442 views

Versioning APIs

Suppose that you have a large project supported by an API base. The project also ships a public API that end(ish) users can use. Sometimes you need to make changes to the API base that supports ...
8
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1answer
2k views

When should I use AtomPub?

I have been conducting some research into RESTful web service design and I've reached what I think is a key decision point so I thought I'd offer it up to the community to get some advice. In keeping ...
8
votes
1answer
625 views

What API design for storing generic data in a more specific format?

for In the project I am working on we send messages about widgets over message queues, serializing them onto the queues as XML. The XML schema contains tags for properties that are common to all types ...
7
votes
3answers
339 views

Is it safe to assume that one controller will only ever use one primary model?

So, I'm designing an MVC framework. In the name of keeping everything statically typed and non-magical, I've come to quite a problem with "automatically" passing models to a controller. So, ...
7
votes
6answers
475 views

Many small requests vs. few large requests (API Design)

I'm currently working on a project with an organization as follows: Client - Gets data from the main server via REST api. Server - Requests data from various other servers via third-party APIs ...
7
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1answer
457 views

How To Handle Login For An Unofficial API?

I am building a tool to access some data on a site (Fitocracy) and I would like to turn it into an unofficial partial API, as no official API exists. If you are not logged in, you cannot get access ...
7
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1answer
193 views

Should I build undo stack in model or its wrapper?

I am building an application (Python/PyQt). The first-order item will be a tree view/model with many helper functions to add new items, move them around in the tree, etc.. Then I will have a main ...
6
votes
3answers
234 views

Does a mobile app need more access than the public API of a site?

I have a site with a public API, and some mobile app developers have been brought in to produce an iPhone app for the site. They insist they need to see the database schema, but as I understand it, ...
6
votes
3answers
266 views

Style bits vs. Separate bool's

My main platform (WinAPI) still heavily uses bits for control styles etc. (example). When introducing custom controls, I'm permanently wondering whether to follow that style or rather use individual ...
6
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2answers
761 views

Is a data service API a good idea?

We currently have a monolithic Rails application that is really three separate applications that make use of the same data. In trying to figure out how to properly compartmentalize and break the ...
6
votes
1answer
142 views

RESTfully Returning Diagnostics Data With Response

In a REST API I am working with, under certain circumstances (ex/ request originated in network) diagnostics data is returned with the response. Right now, a property is appended to the root object of ...
6
votes
2answers
151 views

Guidelines for returning collections from public functions

The Problem Imagine you have a function in a public API that needs to return some kind of collection. Its type is something like foo :: a -> b where b is some kind of collection. As far as I ...
6
votes
1answer
1k views

Sending a collection of data to an API. Multiple small calls vs one big call

I am currently creating an API and implemented a few basic REST actions such as get, update, search etc. Another program that collects data needs to synchronize these to this API. My current thought ...
5
votes
3answers
325 views

Should I provide synonyms in an API?

I'm designing a small library and there is a strong temptation to provide synonyms to some of the exported functions. var foldl = function(){ ... }; var reduce = foldl; //reduce is a synonym for ...
5
votes
4answers
457 views

Should an API be aware of client versions?

Should an API be aware of a client version? The idea of that really goes against the grain for me, but it seems like it is being pushed for in my current project. Am I wrong? Can I get some reasons ...
5
votes
7answers
406 views

Why do certain code elements (classes, methods etc.) in public APIs get deprecated over time?

Today our professor discussed with the class that what "class X or method X get deprecated" means? From what I understood, it means, for example, that we are not going to get that method or class in ...
5
votes
2answers
1k views

Why does java collections not supply a function for the index of max value?

I have been using Collections.max(list) for many projects, but I occasionally want to find the index of that maximum element. I feel silly writing a function to do this for myself in every program I ...
5
votes
9answers
414 views

Populate fields or return object

What is better to do in this type of scenario: populate fields or return an object? The situation is like this: I'm doing calculations to find the prices (inc tax, ex tax, discounted etc) of a ...
5
votes
3answers
538 views

How to handle business rules with a REST API?

I have a REST API to manage a booking system I'm searching how to manage this situation : A customer can book a time slot : A TimeSlot resource is created and linked to a Person resource. In order to ...
5
votes
3answers
319 views

How do I assess tradeoff between robustness and “lazy” code in API design?

Postel's law: Be conservative in what you do, be liberal in what you accept from others. "Lazy" code (per The Pragmatic Programmer): Be strict in what you will accept before you begin, and ...
5
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1answer
515 views

Application internal API

I am currently building a small python CLI (Command Line Interface) application with ambition. In the first development phase I would concentrate on making it work through the CLI interface only, but ...
5
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2answers
234 views

Designing a plug-in system

I'm working on a Java project and I would like to add a plug-in system. More precisely, I would like to let the user design his own module, pack it into a jar, leave it in a "plugins/" subfolder of my ...
5
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1answer
198 views

Multiple APIs, or one API with a “chooser” parameter?

Say you have a web service, which adds business logic on top of a data source. What each API of this service pretty much looks like is - given a set of constraints, give me the items from the data ...