How to Choose the Best Books API in 2026
There are 23 Books APIs in our directory. Of these, 13 require no authentication, making them ideal for quick prototyping. 13 are rated beginner-friendly.
Scores last tested: 2026-08-10
Quick Comparison: Top 10 Books APIs
Ranked by API Score. Measured means we called a real endpoint of that API; Est. means the score is derived from metadata because the endpoint could not be called without credentials. Discontinued APIs are excluded.
| Name | API Score | Auth | HTTPS | CORS | Difficulty |
|---|---|---|---|---|---|
| Thirukkural | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Quran Cloud | 88 A Measured | No Auth | ✓ | ✓ | Beginner |
| Quran-api | 88 A Measured | No Auth | ✓ | ✓ | Beginner |
| Bhagavad Gita telugu | 87 A Est. | No Auth | ✓ | ✓ | Beginner |
| Crossref Metadata Search | 83 A Measured | No Auth | ✓ | ? | Beginner |
| Gutendex | 83 A Measured | No Auth | ✓ | ? | Beginner |
| Penguin Publishing | 82 A Est. | No Auth | ✓ | ✓ | Beginner |
| Bhagavad Gita | 77 B Est. | API Key | ✓ | ✓ | Intermediate |
| Bible-api | 77 B Measured | No Auth | ✓ | ✓ | Beginner |
| PoetryDB | 72 B Measured | No Auth | ✓ | ✓ | Beginner |
Free Books APIs (No Auth)
These APIs require no API key or signup. Start using them immediately.
Bhagavad Gita telugu
⭐ Beginner's PickBhagavad Gita Telugu API delivers all Gita verses in Telugu and Odia languages with no authentication required.
Bible-api
⭐ Beginner's PickBible-api.com is a free, no-auth REST API that returns Bible verses and passages in multiple translations using a simple URL pattern.
British National Bibliography
The British National Bibliography API exposes Linked Data about books published in the UK and Ireland, including titles, authors, ISBNs, and subject classifications.
Crossref Metadata Search
⭐ Beginner's PickCrossref Metadata Search provides free REST access to bibliographic metadata for over 140 million scholarly articles, books, and conference papers indexed by DOI.
Gutendex
⭐ Beginner's PickGutendex exposes the full Project Gutenberg catalogue—over 70,000 free ebooks—as a clean JSON API.
Open Library
⭐ Beginner's PickOpen Library is the Internet Archive's book database covering millions of editions, authors, and subjects.
Try It in 5 Minutes: Bible-api
Quick implementation example using Bible-api.
Using curl
curl 'https://bible-api.com/john+3:16?translation=kjv'
JavaScript
const url = "https://bible-api.com/john+3:16?translation=kjv";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); New to APIs? Read our Getting Started Guide →
Frequently Asked Questions
How many Books APIs are available?
There are 23 Books APIs in our directory as of 2026.
Are there free Books APIs?
Yes, 13 Books APIs require no authentication and are completely free to use.
What is the easiest Books API to use?
Bible-api is one of the easiest to get started with. It is rated as beginner-level and requires no authentication.
Do I need an API key for Books APIs?
It depends. 13 APIs need no authentication, 3 require an API key, and 3 use OAuth.