JSON Viewer Editor Formatter

CosmoVex

Contains adsIn-app purchases

About this app

Open a JSON file, read it clearly, and repair it when it is broken.

No sign-in. No upload. The file stays on your phone, and everything works offline.


OPEN ANY JSON
• Tap a .json file anywhere on your device and it opens here
• Paste from the clipboard — JSON is detected for you
• Load straight from a URL, or open a .har network capture
• Minified and multi-megabyte files open without a blank screen


READ IT CLEARLY
• Tree view — expand and collapse, so a large file makes sense at a glance
• Formatted view with colour-coded syntax and line numbers
• Table and grid views for arrays of records
• Search across keys, values and text
• Breadcrumbs show exactly where you are in a deep structure
• Adjustable font size, dark and light themes


REPAIR BROKEN JSON
• Fixes trailing commas, single quotes, unquoted keys and missing brackets
• Lists exactly which repairs were made, so nothing changes silently
• Validation points at the line and column that failed


FORMAT AND EDIT
• Prettify or minify in one tap
• Edit in place with validation as you type
• Add, rename, duplicate and delete nodes
• Sort keys alphabetically
• Jump to any line


CONVERT AND EXPORT
• Excel, CSV, PDF, XML, YAML and Markdown
• Copy as CSV, XML, key-value pairs or Base64
• Save to your device or share anywhere


ALSO INSIDE
• JSONPath queries
• Compare two JSON documents side by side
• Templates to start from
• Favourites and recent files
• A built-in API client for quick requests


WHO IT IS FOR
Developers checking an API response on the move. QA engineers reading a payload
from a bug report. Anyone handed a .json file with no idea what is inside it.


PRIVACY
Files are processed entirely on your device. Nothing is uploaded, and no account
is required.

Ratings and reviews

I never thought I will need an app like this. Turns out it is always good to have a pocket rocket JSON viewer.

best json tool available in playstore

What’s new

• Fixed freezes when opening minified JSON — a file on a single long line no
longer stalls the editor. Large and minified files now open smoothly.
• The editor tells you when a file is minified instead of calling it "too
large", and offers one-tap Prettify to make it editable.
• Reworked the rating prompt so feedback reaches us instead of getting lost.
• Stability improvements.