With conciseness, we mean that a comprehensive API will enable developers to create full-fledged applications in opposition to your exposed data. Usually, completeness takes place over time, and maximum API designers gradually build on top of the existing APIs. Thus, this is an ideal trait of the best API design that every organization or an engineer having an API should be dedicated to. REST, however, requires no specific interface definition, and offers wider support for data output types. If your API will interact with any non-Microsoft technology, SOAP may cause some interoperability issues.

rest api contract best practices

Likewise, an incorrect call should produce an appropriate 400 or 500 response code with relevant information to help user better operate against the collection. A typical customer enrollment may involve sending a KYC request to an external agency, registering the customer, creating an account, printing debit cards, sending a mail, etc. These steps may be overlapping and the process would be long-running with several failure points.

An Example From The Public Github Api

Access to lists of data items must support pagination to protect the service against overload as well as for best client side iteration and batch processing experience. This holds true for all lists that are larger than just a few hundred entries.

rest api contract best practices

If you query on the Party Summary data contract, you can use the party ID to narrow the result set. For example, if you query on the Party Summary data contract, you can use the party ID to narrow the result set. Coupled together with JSON, which makes something like adding an optional parameter very simple, makes it very flexible and allows for frequent releases without impacting your consumers. This small change greatly increases the burden on the development teams as well as the test teams.

Should Limit Number Of Resource Types

All and all, keep in mind that you need to ensure that your endpoints return JSON REST API as a response. URL encoding is exactly what it sounds like – request bodies where key value pairs are encoded using the same conventions as one would use to encode data in URL query parameters. The server-side portion of the web API is a programmatic interface api testing best practices to a defined request-response message system, and is typically referred to as the Web Service. There are several design models for web services, but the two most dominant are SOAP and REST. In HTTP 1.0 there was no ETag and the mechanism used for optimistic locking was based on a date. Every response contains a Last-Modified header with a HTTP date.

rest api contract best practices

When you implement an operation, make sure you return the correct response status. HTTP has all the features that support you to build great web services. As an organization, you don’t want teams that handle different resources, to approach things differently. If you give importance to the implementation early on, then technical details creep into your service definition.

Best Traits Of Rest Api Architecture Design

The bottom line is that, if you want anyone to use your API, documentation is essential. It’s the first thing users will see, so in some ways it’s like the gift wrap. Present well, and people are more likely to use your API and put up with any idiosyncrasies. Well, I can empathize, but put on your “user perspective” hat and I’ll bet that the one thing you hate more than having to write documentation is having to try to use an undocumented API.

Servers must have the freedom to control their own namespace. Instead, allow servers to instruct clients on how to construct appropriate URIs, such as is done in HTML forms and URI templates, by defining those instructions within media types and link relations. For this requirement, do not create new APIs – instead, enable sorting, filtering, and pagination capabilities in resource collection API and pass the input parameters as query parameters. REST APIs use Uniform Resource Identifiers to address resources. REST API designers should create URIs that convey a REST API’s resource model to the potential clients of the API.

rest api contract best practices

However, I feel like versioning decreases documentation overhead and lowers the learning curve. Provide language-specific libraries to interface with your service. There are some nice tools to automatically generate a library for you, such as Alpaca or Apache Thrift. Thrift supports C++, Java, Python, PHP, Ruby, Erlang, Perl, Haskell, C#, Cocoa, JavaScript, Node.js, Smalltalk, OCaml, Delphi and more. This is really the most important rule in the bunch, and builds on all the others. As I mentioned during the documentation rule, try this out with people that are new to your API. Make sure that they can get up and running with at least a basic implementation of your API, even if it’s just following a tutorial, within a few minutes.

There are a couple of advantages of sticking to identifiers – data flowing over the network is minimized and the data stored by API consumers is also minimized . There are a lot of mixed opinions as to whether the API consumer should create links or whether links should be provided to the API.

Event Basics

If no standard is available, you must define the binary data as string typed property with binary format using base64urlencoding — as also described in MUST use standard data formats. By this we prevent clients from guessing the precision incorrectly, and thereby changing the value unintentionally. Functional naming is a powerful, yet easy way to align global resources ashost, permission, and event names within an application landscape. It helps to preserve uniqueness of names while giving readers meaningful context information about the addressed component. Besides, the most important aspect is, that it allows to keep APIs stable in the case of technical and organizational changes . Component-internalThis is often referred to as a team internal API or a product internal API.

A Seven-Step Guide to API-First Integration – InfoQ.com

A Seven-Step Guide to API-First Integration.

Posted: Tue, 10 Nov 2020 08:00:00 GMT [source]

Identify key stakeholders of API and try to include them during API design phase to get continuous feedback. API design is not influenced by actual implementation limitations & code structure. If the front-end and back-end tasks are separated in your team, preparing the API doc first will also make it possible to parallelize the works. Having the contract written decouples server-side development from the web app.

Rest Api Design Best Practices And Guidelines

Instead, you should handle common parameters globally within your API and use inheritance or a shared architecture to reuse the same naming conventions and data handling consistently throughout your API. Later on, when the API draft is accepted, it may be used a skeleton for the implementation design. Therefore List of computer science journals you can smoothly transition to the sketch-and-fill approach, tackling the challenges in an orderly manner – from the most generic ones down to small implementation details. It is then useful to have the possible responses documented, as every one of them is a manifestation of a single usage scenario.

  • Teams can save time and ensure consistency across all APIs by reusing API design components.
  • Ideally, it is not a convention that needs to be followed every time.
  • A widely-used project management tool provides a simple API that makes you quickly understand REST resources and HTTP methods applied to them.
  • While developing a resource, if we need/wish to add another resource to the existing collection of resources, the API looks like POST /users.

As discussed above, API monitoring is integrable into the test automation process on your CI/CD pipeline. Therefore, the tool you select to use to monitor and control APIs should be able to integrate with your CI server (e.g., Jenkins or Github integration). Note that synthetic monitoring isn’t meant to measure the consumption rate, since it emulates individual transactions instead of monitoring the aggregated volume of transactions. The telemetry instrumentation to measure and report the consumption rate is typically engineered into the API’s design at the onset or monitored with an Application Performance Monitoring tool. You can measure CPU usage across a cluster that hosts your application’s API code, as well as the number of processes waiting to run which is also known as CPU load or run-queue-size. Memory can be simply measured as a percentage of available memory that is in use. You monitor APIs to detect a failed or slow application transaction before your end-users report the problem.

Should Ensure That Data Change Events Match The Apis Resources

The Event Type allows events to have their structure declared with a schema by producers and understood by consumers. An Event Type declares standard information, such as a name, an owning application , a schema defining the event’s custom data, and a compatibility mode declaring how the schema will be evolved. Event Types also allow the declaration of validation and enrichment strategies for events, along with supplemental information such as how events can be partitioned in an event stream.

The immutable API identifier allows the identification of all API specification versions of an API evolution. By using API semantic version information or API publishing date as order criteria you get the version orpublication history as a sequence of API specifications. We use the OpenAPI specification as standard to define API specification files. API designers are required to provide the API specification using a single self-contained YAML file to improve readability. We encourage to use OpenAPI 3.0 version, but still support OpenAPI 2.0(a.k.a. Swagger 2).

In the above example, we have used JSON as a data format for the exchange of information. The second important thing is to remain flexible enough to evolve/enhance API to address the new requirements with new features and resources being exposed. Here is the complete diagram to easily understand REST API’s principles, methods, and best practices.