# Giant JSON Viewer: HAR & API > Open multiGB large JSON files on Android. API Client HAR Analyzer, Export &more. Canonical page: [https://chrome-stats.com/d/com.giantjsonviewer](https://chrome-stats.com/d/com.giantjsonviewer) ## Overview - **ID:** `com.giantjsonviewer` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** Kotysoft - **Category:** TOOLS - **Downloads:** 7,063 - **Rating:** 3.83 / 5 (54 ratings) - **Version:** 1.9.1 - **Last updated:** 2026-08-10 - **First published:** 2026-01-03 - **Publisher country:** IE - **Size:** 35 MB - **Data as of:** 2026-09-13 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.giantjsonviewer) - **Website:** [https://giantjson.com](https://giantjson.com/) - **Privacy policy:** [https://giantjson.com/docs/privacy-policy/](https://giantjson.com/docs/privacy-policy/) ## Description A JSON viewer and analysis toolkit built for files that crash everything else.

Supports: json jsonl ndjson har CBOR MsgPack md

Made for developers, analysts, and QA engineers who work with massive datasets -- multi-GB logs, database dumps, API responses -- directly on Android. No ads, No cloud, no account, no limits*.

While most viewers struggle above 50MB, GiantJSON Viewer uses a native Rust engine to handle multi-gigabyte files without running out of memory. Built and maintained by a solo indie developer.

BUILT FOR PERFORMANCE
• Large JSON Support: Open files that other viewers can't handle
• SIMD accelerated Indexing: First load builds an index for instant navigation
• Memory Safe: Designed to prevent Out-Of-Memory crashes on any device
• Rust + SIMD Core: Native speed, not a JavaScript wrapper

DEVELOPER TOOLKIT
• SQL & CSV Export: Convert to SQL queries or CSV tables
• Data Masking: Redact selected fields during export
• Advanced Filter: Visual query builder with field-level conditions
• Search & Regex: Full-text search / filter with regex support
• GenAI Regex Builder: Describe what you need, AI writes the regex
• JSON Path Navigation: Jump directly to any node
• Schema Export: Export structure as JSON Schema, TypeScript, or Markdown
• Auto-prettify and syntax highlight in RAW text mode with tree mode collapse feature

API CLIENT
REST and GraphQL client, right on your phone:
• GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS + GraphQL queries
• Auth: Basic, Bearer, OAuth 2.0 (with PKCE), AWS Signature V4
• Postman collection import with folder structure and variables
• Environment support with variable precedence
• File attachments, binary uploads, session cookies
• Import/export via cURL
• Responses open directly in the viewer

HAR ANALYZER
Drop a .har file and get a full network analysis dashboard:
• Overview stats: request count, response times, errors, transfer size
• Timing breakdown, status distribution, domain summary
• Filter by method, status, content type, domain, or response time
• Request detail tabs: headers, cookies, body, timing waterfall, TLS
• Clone any request to API Client or copy as cURL

BASIC MOCK API SERVER
Turn your phone into a (basic) mock API server

JSON DIFF - COMPARE FILES
• Structural compare of two JSON / NDJSON files -- formatting and key order never count
• Detects moved and renamed data; repeated changes grouped into patterns
• Multi-GB tested; match list items by id; Markdown / NDJSON report export

3 VIEW MODES
• TEXT: Raw view with syntax highlighting, formatting and collapsible tree
• BROWSER: Stream through gigabytes like a folder structure
• STRUCTURE: Visualize data structure as a graph to understand its shape

HOSTED WEB TOOLS - a private toolset on your local network
• File Transfer -- drag and drop files, no cables, no cloud, no size limit
• JWT Decoder -- decode tokens, inspect header and payload, check expiry
• Timestamp Converter -- epoch to human-readable and back
• JSON Formatter -- format, minify, stringify, unescape
• URL Encoder -- encode, decode, and parse URLs with query breakdown

MORE
• Markdown Viewer: Render .md files
• Bookmarks: Save locations in huge files to find later in Browser Mode
• Hide Paths: hide irrelevant elements from view
• Unescape & Prettify: Fix serialized or minified JSON
• JSON Schema Validator: Validate against a schema file with detailed error report

PRIVATE & SECURE
Everything runs locally on your device.
• No cloud uploads, no account registration
• GenAI Regex only calls AI to generate patterns -- your data never leaves
• (!) Anonymous crash reports and usage statistics collected for development (can opt out)

This app is a one-person project under active development. If you find it useful, a review on Google Play helps more than you'd think.

*Theoretical limits are 1TB, 255 depth, storage space, and some RAM requirement. ~100GB tested ## Rankings - #637,300 — Overall - #2 — json - #74 — query ## Permissions and access ### Permissions - `android.permission.ACCESS_ADSERVICES_AD_ID` - `android.permission.ACCESS_ADSERVICES_ATTRIBUTION` - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.ACCESS_WIFI_STATE` - `android.permission.FOREGROUND_SERVICE` - `android.permission.FOREGROUND_SERVICE_SPECIAL_USE` - `android.permission.INTERNET` - `android.permission.POST_NOTIFICATIONS` - `android.permission.READ_EXTERNAL_STORAGE` - `android.permission.READ_MEDIA_DOCUMENTS` - `android.permission.VIBRATE` - `android.permission.WAKE_LOCK` - `com.android.vending.BILLING` - `com.android.vending.CHECK_LICENSE` - `com.giantjsonviewer.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` - `com.google.android.c2dm.permission.RECEIVE` - `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE` - `com.google.android.gms.permission.AD_ID` ## Similar extensions and apps - [JSON Viewer: Open JSON Files](https://chrome-stats.com/d/com.javi22apps.jsonviewer) — 3,153 users - [JSON Reader - Open JSON files](https://chrome-stats.com/d/com.itbuilds.jsonviewer) — 668 users - [JSON Pro - Viewer & Editor](https://chrome-stats.com/d/app.jsonpro) — 92 users - [JSON File Opener & Editor](https://chrome-stats.com/d/com.orishin.jsonviewer) — 87 users - [JSON Viewer](https://chrome-stats.com/d/aman.jsonviewer) — 299 users - [Json File Viewer Json Opener](https://chrome-stats.com/d/com.json.fileviewer.json.fileopener) — 121 users - [JSON Viewer(Pro)](https://chrome-stats.com/d/com.anvaysoft.jsonviewerpro) — 17 users - [Json Genie: JSON Viewer/Editor](https://chrome-stats.com/d/com.tuyware.jsongenie) — 7,374,600 users, 4.04 / 5 - [JSON Analyzer & API Tester](https://chrome-stats.com/d/com.siamakerlab.jsonanalyzer) — 37 users - [JSON Viewer](https://chrome-stats.com/d/com.techtool.jsonviewer) — 470 users - [JSON Viewer - Graph Visualizer](https://chrome-stats.com/d/com.jsonviewer) — 474 users - [JSON Viewer](https://chrome-stats.com/d/com.tooltoolnam.json_viewer) — 41 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.giantjsonviewer)