Add your FB2 file
Drop one or more .fb2 files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
FB2 to JSON
Converting a .fb2 ebook to .json carries the book's reading-order content into a different package. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop FB2 files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting FictionBook ebook to JSON data
Converting a .fb2 ebook to .json carries the book's reading-order content into a different package. FictionBook 2.0, written to disk as .fb2, is an XML ebook format that describes a book's structure — chapters, epigraphs, poems, citations — rather than its visual appearance. Because everything including images lives in one XML document, an .fb2 file is easy to parse, validate, and transform.
A .json file holds JavaScript Object Notation: nested objects, arrays, strings, numbers, booleans, and null written in a strict text syntax. It is the default data language of the web — most APIs speak nothing else. For this route the practical draw is parsers ship in the standard library of essentially every language and readable by humans and machines alike — balanced against no comments — a perpetual annoyance for configuration files, which is worth knowing before you commit a large batch.
Why convert FB2 to JSON?
The practical trigger for this conversion is usually a mismatch: with .fb2, base64-encoded images inflate the uncompressed size by roughly a third. Switching to .json buys you parsers ship in the standard library of essentially every language, which is why it is the better fit for rEST and HTTP API request and response payloads. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
FB2 vs JSON at a glance
| Aspect | FictionBook ebook (.fb2) | JSON data (.json) |
|---|---|---|
| Format type | Text-based — characters and structure, so there is no visual quality loss | Text-based — characters and structure, so there is no visual quality loss |
| How it stores data | a single well-formed XML file; binary resources such as cover art are embedded as base64 inside binary elements | exactly six value types; no dates, no comments, no trailing commas — the strictness is deliberate |
| Strongest at | ebook distribution in Russia and Eastern Europe, where it is a native store format | rEST and HTTP API request and response payloads |
| Weak spot | base64-encoded images inflate the uncompressed size by roughly a third | no comments — a perpetual annoyance for configuration files |
Pick JSON as the output
Select .json in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if JSON is selectable, the route is real and validated.
Convert on your device
Press Convert. The book package is parsed in your browser in spine order; DRM-free files only, and nothing is uploaded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid JSON file. Outputs keep the original filename with the .json extension.
FB2 to JSON questions, answered
Will converting FB2 to JSON lose quality?
There is no visual quality to lose — fb2 is text-oriented and json is text-oriented, so the question is structural fidelity. Text, ordering, and basic structure are preserved; complex layout, embedded objects, and styling beyond the target's model are simplified.
Is it private to convert FB2 files here?
Yes — the .fb2 file is processed inside your browser tab and never uploaded. The book package is parsed in your browser in spine order; DRM-free files only, and nothing is uploaded. Close the tab and the file is gone from memory.
Where will the JSON file work?
Browsers parse it natively through JSON.parse, every mainstream language bundles support, and most editors validate and highlight it out of the box. Viewing a raw .json file is possible in any text editor or browser tab.
Will the JSON file be bigger or smaller than my FB2?
It depends on the content: exactly six value types; no dates, no comments, no trailing commas — the strictness is deliberate. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my FB2 file?
In .fb2, a mandatory description block records title, authors, genres, language, translator, and publishing history in structured XML — richer than most rival ebook formats. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.