--- title: "PDF.js JSON profiles: format and application order - WebTolk websites development, Joomla Extensions" description: "The root is a flat object of 6.4.299 PDFViewerApplicationOptions (AppOptions) names. Write options directly in the root object, without options/viewer/pdfjs…" url: "https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js/documentation/json-format" date: "2026-10-09T19:20:20+00:00" language: "en-GB" --- ## Breadcrumbs [Home](https://web-tolk.ru/en) > [Joomla extensions](https://web-tolk.ru/en/dev) > [Joomla plugins](/en/dev/joomla-plugins) > [WT PDF.js](/en/dev/joomla-plugins/wt-pdf-js) > [Documentation](/en/dev/joomla-plugins/wt-pdf-js/documentation) > PDF.js JSON profiles: format and application order # PDF.js JSON profiles: format and application order WT PDF.js - Documentation **Category:** [Joomla plugins](https://web-tolk.ru/en/dev/joomla-plugins) [Project](https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js)[Versions](https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js/versions)[Documentation](https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js/documentation)[GitHub](https://github.com/mozilla/pdf.js) The root is a flat object of 6.4.299 PDFViewerApplicationOptions (AppOptions) names. ## Option validation and precedence The root is a flat object of 6.4.299 `PDFViewerApplicationOptions` (AppOptions) names. Write options directly in the root object, without options/viewer/pdfjs wrappers. JSON cannot contain comments or trailing commas. Save the file as UTF-8 without a BOM. - Known strings, numbers and booleans need correct types: `"2"` is not `2`; `"false"` is not `false`. - The object exception is `localeProperties: {"lang":"ru"}`; only lang is applied. - Unknown names and incorrect types are skipped with a warning. viewerCssTheme is restricted to 0, 1, 2. Follow the reference for other numeric enums: the loader does not validate every range. - Options with null defaults, runtime objects, functions and workerPort cannot be configured through JSON. The API parameter rangeChunkSize is absent from viewer AppOptions and is not accepted in a profile. - Do not edit app_options.js, viewer.mjs or pdf.mjs: the profile is applied before viewer startup. PDF.js defaults are loaded first, followed by accepted JSON options. An active profile forces `disablePreferences=true`, so browser Preferences cannot replace it. Even empty `{}` uses this rule. JSON `disablePreferences=false` is ignored; use `config=none` for normal Preferences. A nonempty profile with only rejected options and no disablePreferences key preserves standard preference behavior. Preferences and a particular PDF view history are separate. `viewOnLoad=0` can restore the previous page, zoom and modes. Set `viewOnLoad=1` to use initial profile settings. An explicit `#page=3&zoom=150` still selects page/zoom and may override the profile. JSON specifies startup behavior; it does not lock buttons or user actions. ## JSON-LD Schema ```json { "@context": "https://schema.org", "@type": "BreadcrumbList", "@id": "https://web-tolk.ru/#/schema/BreadcrumbList/17", "itemListElement": [ { "@type": "ListItem", "position": 1, "item": { "@id": "https://web-tolk.ru/en", "name": "Home" } }, { "@type": "ListItem", "position": 2, "item": { "@id": "https://web-tolk.ru/en/dev", "name": "Joomla extensions" } }, { "@type": "ListItem", "position": 3, "item": { "@id": "/en/dev/joomla-plugins", "name": "Joomla plugins" } }, { "@type": "ListItem", "position": 4, "item": { "@id": "/en/dev/joomla-plugins/wt-pdf-js", "name": "WT PDF.js" } }, { "@type": "ListItem", "position": 5, "item": { "@id": "/en/dev/joomla-plugins/wt-pdf-js/documentation", "name": "Documentation" } }, { "@type": "ListItem", "position": 6, "item": { "name": "PDF.js JSON profiles: format and application order" } } ] } ``` ```json { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://web-tolk.ru/#/schema/Organization/base", "name": "WebTolk", "url": "https://web-tolk.ru/", "logo": { "@type": "ImageObject", "@id": "https://web-tolk.ru/#/schema/ImageObject/logo", "url": "https://web-tolk.ru/images/webtolk-1080p.jpg", "contentUrl": "https://web-tolk.ru/images/webtolk-1080p.jpg", "width": 1920, "height": 1080 }, "image": { "@id": "https://web-tolk.ru/#/schema/ImageObject/logo" }, "sameAs": [ "https://github.com/WebTolk", "https://github.com/sergeytolkachyov", "https://vk.com/web_tolk", "https://vk.com/webtolkru", "https://tenchat.ru/sergeytolkachyov", "https://t.me/sergeytolkachyov", "https://t.me/webtolkru" ] }, { "@type": "WebSite", "@id": "https://web-tolk.ru/#/schema/WebSite/base", "url": "https://web-tolk.ru/", "name": "WebTolk websites development, Joomla Extensions", "publisher": { "@id": "https://web-tolk.ru/#/schema/Organization/base" } }, { "@type": "WebPage", "@id": "https://web-tolk.ru/#/schema/WebPage/base", "url": "https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js/documentation/json-format", "name": "PDF.js JSON profiles: format and application order - WebTolk websites development, Joomla Extensions", "description": "The root is a flat object of 6.4.299 PDFViewerApplicationOptions (AppOptions) names. Write options directly in the root object, without options/viewer/pdfjs…", "isPartOf": { "@id": "https://web-tolk.ru/#/schema/WebSite/base" }, "about": { "@id": "https://web-tolk.ru/#/schema/TechArticle/base" }, "inLanguage": "en-GB", "breadcrumb": { "@id": "https://web-tolk.ru/#/schema/BreadcrumbList/17" } }, { "@type": "TechArticle", "headline": "PDF.js JSON profiles: format and application order", "url": "https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js/documentation/json-format", "description": "The root is a flat object of 6.4.299 PDFViewerApplicationOptions (AppOptions) names.", "mainEntityOfPage": { "@type": "WebPage", "url": "https://web-tolk.ru/en/dev/joomla-plugins/wt-pdf-js/documentation/json-format" } } ] } ```