EPUB vs JSON
Una comparativa detallada de EPUB eBook y JSON Data — tamaño de archivo, calidad, compatibilidad y cuál elegir según tu flujo de trabajo.
EPUB eBook
eBooksEPUB is the open standard for reflowable digital books. It adapts text to any screen size and is supported by most e-readers except Kindle. EPUB 3 adds support for multimedia and interactivity.
Sobre los archivos EPUBJSON Data
Documents & TextJSON (JavaScript Object Notation) is a lightweight data interchange format that is human-readable and easy for machines to parse and generate. It has become the dominant format for web APIs, configuration files, and structured data exchange.
Sobre los archivos JSONComparativa de ventajas
EPUB Ventajas
- Open standard — no vendor lock-in, no DRM required.
- Reflowable text — adapts to any screen size, font size, or orientation.
- Rich typography via CSS, embedded fonts, and SVG.
- Accessibility-first: native support for screen readers, adjustable text, and alt-text.
- Universal across every non-Kindle ebook reader and library app.
JSON Ventajas
- Dead-simple — you can memorize the entire grammar on one page.
- Native parsers in every programming language.
- Human-readable and easy to debug.
- Compact — much smaller than equivalent XML.
- Frozen spec — a JSON parser written in 2010 still handles new JSON files from 2026.
Limitaciones
EPUB Limitaciones
- Kindle does not support EPUB natively (Amazon wants you to convert to AZW3).
- Fixed-layout EPUBs (for children's books, comics) are awkward to author.
- Rendering quality varies between apps — some CSS works everywhere, some does not.
- Adobe DRM (ADEPT) or Apple FairPlay are optional layers that complicate portability.
JSON Limitaciones
- No comments allowed — config files feel verbose.
- No trailing commas — a constant source of parse errors.
- No native date, decimal, or binary types — everything is strings or numbers.
- Easily bloated by repeated keys; large payloads compress poorly vs binary alternatives.
- Streaming is awkward — JSON wants to be parsed whole.
Especificaciones técnicas
| Especificación | EPUB | JSON |
|---|---|---|
| MIME type | application/epub+zip | application/json |
| Extension | .epub | .json |
| Container | ZIP archive | — |
| Markup | XHTML 1.1 (EPUB 2); HTML5 (EPUB 3) | — |
| Standards | IDPF/W3C EPUB 2.0.1, 3.0, 3.2, 3.3 | — |
| Standard | — | ECMA-404, RFC 8259 |
| Encoding | — | UTF-8, UTF-16, or UTF-32 |
| Allowed types | — | object, array, string, number, boolean, null |
Tamaños típicos de archivo
EPUB
- Novel (300 pages, text only) 200-800 KB
- Illustrated reference book 5-30 MB
- Fixed-layout children's book 30-100 MB
JSON
- Small config < 1 KB
- REST API payload 1-100 KB
- Database export 10 MB - 100 GB
¿Listo para convertir?
Convierte entre EPUB y JSON online, gratis y sin instalar nada. Subida cifrada, eliminación automática a las 2 horas.
Frequently Asked Questions
EPUB (Electronic Publication) is the open standard eBook format maintained by the W3C. It supports reflowable text that adapts to screen size, embedded fonts, images, and interactive content, making it the most widely supported eBook format globally.
JSON (JavaScript Object Notation) is a lightweight text format for data exchange, popularized by Douglas Crockford around 2001. JSON represents nested objects, arrays, strings, numbers, booleans, and null values in a syntax derived from JavaScript. It is the default data format for modern web APIs.
EPUB files open in Apple Books, Google Play Books, Calibre (free), Kobo eReaders, and Adobe Digital Editions. Note that Amazon Kindle does not natively support EPUB, so conversion to MOBI or AZW3 is needed.
JSON files are plain text — open them in any text editor (Notepad, VS Code, Sublime Text, TextEdit). For formatted reading, use JSON-aware editors (VS Code auto-indents) or online viewers like jsonformatter.org. Every web browser displays JSON directly if you open the file locally.
Use EPUB for reading on phones and eReaders since it reflows text to fit any screen. Use PDF for documents with fixed layouts like textbooks with precise formatting, scanned pages, or documents intended for printing.
Use KaijuConverter's JSON-to-CSV converter for nested data flattened into a tabular format. For simple flat JSON (array of objects), command-line tools like jq + csvkit give more control. Python's pandas and JavaScript's PapaParse also handle the conversion in one line of code.