JSON Master
JSON viewer, editor, formatter
Free
A fast, native JSON editor for iPhone, iPad and Mac. Jump to any value by name, decode JWT tokens, query with JSONPath and repair almost-JSON in one tap.
JSON Master is a native JSON editor built around what you actually do with JSON every day: find the value, copy its path, understand what a field really contains — and fix the file when it doesn't parse.
See the whole document as a tree and as colour-highlighted source, side by side on iPad and Mac. Both are the same file: change one, and the other follows.
FIND YOUR WAY
• Command palette: type a few letters and jump to any node or run any command — "custcity" finds customer.address.city
• Breadcrumbs, back and forward after every jump
• Search keys and values, step through matches
• Full keyboard navigation on Mac and iPad
UNDERSTAND A VALUE
• Unix timestamps shown as readable dates
• JWT tokens decoded: header, claims and expiry
• base64, ISO dates and URLs recognised on sight
• Warnings for integers too large for JavaScript
• Collapsed branches show their first keys, so you often don't need to open them
QUERY, COMPARE, GENERATE
• JSONPath queries with live results — tap one to jump to it
• Compare two documents by structure, not by line breaks
• Generate Swift Codable, TypeScript interfaces or JSON Schema
• Summary with node counts, depth and findings worth a look
FIX AND EDIT
• A broken file shows the exact line and column of the error
• One-tap repair for almost-JSON: comments, trailing commas, single quotes, bare keys
• Edit keys and values, change types, add, duplicate and delete — every edit undoable
• Format, minify, sort keys, expand embedded JSON strings, convert JSON Lines
• Copy paths in six notations: dot, JSONPath, brackets, jq, Swift and JSON Pointer
MADE FOR LARGE FILES
Files of tens of megabytes open without freezing, with progress shown while they load.
YOUR WAY
Four themes — Midnight, Graphite, Amber CRT and Daylight — and seven languages: English, German, French, Ukrainian, Spanish, Japanese and Portuguese.
No account, no ads, no tracking. Your files stay on your device.
LEGAL
• Privacy Policy: https://vybgss.github.io/json-master-docs/privacy-policy.html
• Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• New look with four themes: Midnight, Graphite, Amber CRT and Daylight
• Command palette (⌘K): jump to any node or run any command by typing a few letters
• Breadcrumbs, back and forward navigation, full keyboard control in the tree
• One-tap repair for almost-JSON: comments, trailing commas, single quotes
• Broken files now show the exact error with the surrounding lines
• Large files open in the background with a progress indicator
• Collapsed branches preview their first keys
• Settings reorganised into sections
• New app icon
The developer, Volodymyr Sichka, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 5.1 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Provider
Volodymyr Sichka
- Volodymyr Sichka has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © 2026 Volodymyr Sichka