JSON Editor - Viewer & Format

CosmoVex

Contains adsIn-app purchases

About this app

Fix broken JSON, then view and edit it in a clean tree. JSONVEdit is an offline JSON viewer, editor, and repair tool that opens any JSON file — with live validation, a built-in API client, no intrusive ads, and no account required.

Broken JSON? Invalid data? Need to test an API? JSONVEdit fixes it instantly, validates it accurately, and exports to the format you need (Excel, PDF, CSV, XML, YAML) — all without leaving the app.

VALIDATION & FIXING
- JSON Fixer — automatically repairs broken JSON (missing quotes, trailing commas, unquoted keys)
- JSON Schema Validation (Draft 7) — validate against any standard schema
- Detailed error messages with line and column numbers
- Real-time validation as you type
- JSONPath queries to extract specific data

EXPORT & CONVERT
- Export as Excel (.xlsx) — convert JSON arrays to spreadsheets instantly
- Export as PDF — generate clean PDF documents from JSON
- Convert to YAML, CSV, XML, or Key=Value pairs
- Share results via any app or save to device

API TESTING
- Built-in HTTP client — send GET, POST, PUT, DELETE, PATCH requests
- Add custom headers and request bodies
- View responses with status, time, and size
- Request history for quick re-use
- Open responses directly in the viewer

EDITING & COMPARISON
- Tree view with expand/collapse and search
- Code view with syntax highlighting and line numbers
- Side-by-side JSON comparison with color-coded differences
- Edit, delete, duplicate, and clone nodes directly
- Sort keys alphabetically

PERFECT FOR
- Developers testing APIs and debugging responses
- Backend engineers validating JSON data formats
- API testers working with REST/GraphQL endpoints
- Data analysts converting JSON to spreadsheets
- DevOps teams inspecting configuration files
- Anyone who needs to format, fix, or understand JSON

EXTRA FEATURES
- Auto-detect JSON in clipboard
- HAR file support (HTTP Archive)
- 10+ JSON templates for quick start
- Favorites to bookmark frequently used files
- Session resume — continue where you left off
- Open .json files directly from file manager
- JetBrainsMono font for code display

Available in 15 languages: English, Hindi, Spanish, Portuguese, Bengali, Urdu, French, Arabic, Indonesian, German, Chinese, Japanese, Korean, Turkish, Russian.

Completely offline. No account required. No data collection. Made by Cosmovex.

What’s new

• Discover more free Cosmovex tools — crisp on-device artwork, loads instantly even offline
• Friendly thank-you + review prompt after going Pro
• Stability improvements