Finally, a JSON toolkit that actually works with huge files.
Built for developers, analysts, and QA engineers who handle massive JSON datasets — multi-GB logs, database dumps, API responses — directly on Android. No cloud. No limits.
While other apps crash above 50MB, GiantJSON uses a native Rust + SIMD core to open multi-gigabyte files efficiently. Actively developed by an indie developer.
PRIVATE & SECURE
Every operation runs locally. Your files never leave your device.
• All analysis, search, and export happens offline
• No cloud uploads, no hidden servers
• GenAI Regex calls the AI only to generate patterns; your data stays on-device
EXTREME PERFORMANCE
• Multi-GB File Support: Handles datasets that break every other viewer
• Smart Indexing: Builds an index on first load for instant navigation
• Memory Efficient: Prevents Out-Of-Memory crashes on any device
• Rust + SIMD Core: Native speed, not a JavaScript wrapper
DEVELOPER TOOLKIT
• Schema Analysis: Auto-detect field types and data patterns across huge files
• SQL & CSV Export: Convert JSON into SQL queries or CSV for Excel/Sheets
• Data Masking: Redact fields during export — strings become "[REDACTED]", numbers become 123
• Search & Regex: Text search with regex support in raw text mode
• Advanced Filter: Visual query builder with operators and field-level conditions
• GenAI Regex Builder: Describe what to find, AI generates the regex
• JSON Path: Navigate directly to specific nodes
• Schema Export: Export structure as JSON Schema, TypeScript, or Markdown
[EXPERIMENTAL] API CLIENT
Built-in REST & GraphQL client:
• Methods: GET, POST, PUT, PATCH, DELETE + GraphQL
• Custom headers, auth (Basic, Bearer), multiple body types
• Import/export via cURL, save & organize requests
• Responses open directly in the viewer
[EXPERIMENTAL] MOCK API SERVER
Host mock endpoints from your phone:
• Custom path, method, status codes, and headers per endpoint
• Any JSON file as response body
• Web UI dashboard with endpoints and request logs
• Save/load server configurations as presets
[EXPERIMENTAL] LOCAL RECEIVE
Transfer files from desktop to phone without cables or cloud:
• Phone hosts a local web page on your WiFi
• Drag & drop files from your browser — land directly in the app
• No account, no desktop install — only limit is your storage
3 VIEW MODES
1. Browser: Stream through gigabytes like a feed — best for massive files
2. Structure: Visualize JSON as a graph to understand data shape
3. Text: Raw JSON with syntax highlighting (read-only)
MORE FEATURES
• Markdown Viewer: Open and render .md files
• Bookmarks: Save locations in huge or invalid files
• Unescape & Prettify: Fix serialized JSON with one tap
• Hide Paths: Hide irrelevant arrays or objects
• Schema Validation: Validate against a schema file
Supported: .json, .jsonl, .ndjson, .md
Stop struggling with "Out of Memory" crashes. Download GiantJSON Viewer+ and master your data.
---
Keywords: json viewer, large json, json reader, json to sql, json to csv, log viewer, developer tools, offline json, android developer, rust, huge file opener, api client, graphql, mock api, mock server, data masking, file transfer, markdown viewer, json schema