---
title: "Most important factor in APIs is complete and accurate documentation"
date: 2015-01-15
description: "API documentation survey 1.0 I need your responses to my API Documentation Survey 1.1 API..."
canonical_url: https://idratherbewriting.com/2015/01/15/most-important-factor-in-apis-is-complete-and-accurate-documentation/index.html
---

> For AI agents: a documentation index is available at https://idratherbewriting.com/llms.txt. Markdown versions of all pages are available by appending .md to any page URL.

# Most important factor in APIs is complete and accurate documentation

1. [1.0 I need your responses to my API Documentation Survey](https://idratherbewriting.com/2014/12/12/i-need-your-responses-to-my-api-documentation-survey/)
2. [1.1 API doc survey: The most popular type of APIs that technical writers document](https://idratherbewriting.com/2014/12/17/the-most-popular-type-of-apis-that-technical-writers-document/)
3. [1.2 API doc survey: The most common programming languages tech writers know](https://idratherbewriting.com/2014/12/22/most-common-programming-languages-tech-writers-in-my-survey-know/)
4. [1.3 API doc survey: Authoring tools preferred by API documentation writers](https://idratherbewriting.com/2014/12/24/authoring-tools-preferred-by-api-doc-writers-in-my-survey/)
5. [1.4 API doc survey: Do you create API doc by looking at source code?](https://idratherbewriting.com/2015/01/02/api-doc-survey-do-you-create-doc-by-looking-at-source-code/)
6. [1.5 API doc survey: Do you test out the API calls used in your doc yourself?](https://idratherbewriting.com/2015/01/02/api-doc-survey-do-you-test-out-the-api-calls-used-in-your-doc-yourself/)
7. [1.6 API doc survey: What IDE do you use?](https://idratherbewriting.com/2015/01/02/api-doc-survey-what-ide-do-you-use/)
8. [1.7 API doc survey result: Automating REST API documentation](https://idratherbewriting.com/2015/01/06/api-doc-survey-automating-rest-api-documentation/)
9. [1.8 API doc survey result: How do you get the source files that contain code comments?](https://idratherbewriting.com/2015/01/06/api-doc-survey-result-how-do-you-get-the-source-files-that-contain-code-comments/)
10. [1.85 API doc survey result: How to learn what you need to know?](https://idratherbewriting.com/2015/01/07/api-doc-survey-result-how-to-learn-what-you-need-to-know/)
11. [1.9 API doc survey: Most challenging aspect of API documentation](https://idratherbewriting.com/2015/01/12/api-doc-survey-most-challenging-aspect-of-api-documentation/)
12. [2.0 API doc survey: Do engineers write API doc in the source code?](https://idratherbewriting.com/2015/01/15/api-doc-survey-do-engineers-write-api-doc-in-the-source-code/)
13. [2.1 API doc survey: How much of your doc process is automated?](https://idratherbewriting.com/2015/01/15/api-doc-survey-how-much-of-your-doc-process-is-automated/)
14. 2.2 → Most important factor in APIs is complete and accurate documentation

*This question wasn't part of my survey, but it was part of another survey. I thought the results were relevant enough to include here as part of this series.*

A 2013 [survey by Programmable Web](http://www.programmableweb.com/news/api-consumers-want-reliability-documentation-and-community/2013/01/07) that included about 250 respondents found that complete and accurate documentation was the most important factor in an API: [![completedoc](https://s3.us-west-1.wasabisys.com/idbwmedia.com/images/completedoc-550x344.png)](http://www.programmableweb.com/news/api-consumers-want-reliability-documentation-and-community/2013/01/07)

This is certainly an encouraging finding for technical writers, and suggests that more attention and focus should be given to documentation. I think I'm going to print this picture out and tape it on my office wall.

Why is documentation so important for APIs in contrast to GUI-based products? API documentation is important because it is the interface for the product. With APIs, there is no user interface that people can figure out on their own. If you don't have clear and accurate documentation, the developer won't figure out how to use the API. Can you imagine guessing what an endpoint might be, or what parameters it takes?