JSON Formatter & Viewer - Markdown Toolbox

Format, view and edit JSON with syntax highlighting, folding and search. Preview Markdown documents in your browser.

Read, edit and compare JSON / Markdown in your browser. Ordinary websites stay unchanged. JSON READER • Formatted and original views, line numbers in formatted view, folding and array item counts. Raw view preserves the response text. • Search keys and values with keyword, case-sensitive or regular-expression matching. Highlight every matching word and move between results, including folded fields. • Invalid or slow expressions show a clear message so you can change the query and continue. • Copy an entire array or object as standalone JSON. Preserve large integers, number notation, property order and duplicate keys. • Copy formatted or original content, copy a selected value, or download the original document. PRO EDITOR • Open an editor tab from the reader with the current JSON / Markdown already loaded. Paste text, choose a file or drop one in. • Lossless JSON formatting and validation, undo, restore original, preview, copy and download. • Compare two JSON documents and navigate added, removed and changed fields. • No fixed file-size cutoff. Large previews use paged source; complex structures have processing limits. MARKDOWN AND READING • Preview and source views, clickable contents, tables, read-only task lists and code copy. • Choose system, light or dark appearance, font size, wrapping, density and content width from the extension popup. Exit formatting or turn reading off for the current site there. • JSON image previews load after an explicit hover, focus or click. Markdown images require a click to load. • English and Simplified Chinese interface. HOW TO USE Open a JSON response or raw .md / .markdown URL, or open the pro editor from the extension popup. Reading file:// documents requires “Allow access to file URLs” in extension details. Choosing or dropping a file does not need that switch. PRIVACY Documents and search queries are processed locally and never uploaded to the publisher. Editor text is discarded on refresh or close. Disabled sites may sync through Chrome; reading preferences stay on this device. Requested image previews contact the specified image address without the document's Referer. No ads, analytics, accounts or paid features. PERMISSIONS Website access detects and displays the document you opened. Storage remembers disabled sites and reading preferences. 1.7.1: All-match search highlighting and smoother dense-result navigation, case-sensitive and regex search, simpler reader controls and reading settings in the popup. SUPPORT https://github.com/danweiyuancircle/docs/issues