Giant JSON Viewer: HAR & API

1.8.5.11

Kotysoft

3.63

47 reviews

5,000+
Downloads

Free

Open multiGB large JSON files on Android. API Client HAR Analyzer, Export &more.

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About Giant JSON Viewer: HAR & API

Giant JSON Viewer: HAR & API is a tools app developed by Kotysoft.

How many times has Giant JSON Viewer: HAR & API been downloaded?

Giant JSON Viewer: HAR & API has been downloaded 5.9 thousand times. In the last 30 days, the app was downloaded 540 times.

What is the rating of Giant JSON Viewer: HAR & API?

Giant JSON Viewer: HAR & API is rated 3.63 out of 5 stars, based on 47 ratings.

Is Giant JSON Viewer: HAR & API free?

Giant JSON Viewer: HAR & API is free to download. The APK download size is 17.68 MB. The latest version available is 1.8.5.11. The last update was on May 29, 2026.

What are the requirements for Giant JSON Viewer: HAR & API?

The app has a content rating of Everyone. The app has been available on Google Play January 2026.

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 mock API server:
• Custom endpoints with method, status code, and headers
• Point responses to local files
• Web dashboard with request logging

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.
• All search, analysis, and export happens offline
• 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. And if
something isn't working right, the in-app feedback goes straight to the developer.

*Theoretical limits are 1TB, 255 depth, storage space, and some RAM requirement. ~100GB tested

Recent changes:
minor bugfixes

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More data about Giant JSON Viewer: HAR & API

Price	Free to download
Total downloads	5.9 thousand
Recent downloads	540
Rating	3.63 based on 47 ratings
Ranking	Not ranked
Version	1.8.5.11
APK size	17.7 MB
Number of libraries	?
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the Giant JSON Viewer: HAR & API app

Giant JSON Viewer: HAR & API compared with similar apps

Common keywords of similar apps

Api Export Har Regex Structure Client Schema Request Analysis Responses Cloud Memory Developer Filter Mode Status Large Analyzer Toolkit Crash Md Multi Account Limits Viewers Native Rust Handle Simd Navigation Sql Csv Queries Query Builder Full Genai Json Files Viewer File Open Built Directly Support Data Search Text View Device

Keywords missing from this app

User App Pdf Storage Manager Xml Feature Zip Editor Edit Reader Create Opener Convert Recent Share Converted Delete Easily Genie Browse Read Free Lets Jl Rar Archives Favorite Access Image Tool Extractor Format Manage Explorer Documents Features

Google Play Rating history and histogram

Rating history

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Downloads over time

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Giant JSON Viewer: HAR & API has been downloaded 5.9 thousand times. Over the past 30 days, it averaged 18 downloads per day.

Changelog of Giant JSON Viewer: HAR & API

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Developer information for Kotysoft

Kotysoft

support@giantjson.com

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Comments on Giant JSON Viewer: HAR & API for Android

★★★★★ Stephen Collins · Mar 28, 2026

This JSON Viewer app is a game-changer! It’s super easy to load and view large JSON files, and the interface is clean and fast. If you handle JSON often, I’d definitely recommend giving it a try!

★★★★★ Andreas Day · Apr 1, 2026

Finally, an app to open huge JSON files. This really helps with remote debugging or reporting on the go. The app actually feels smoother and faster than some desktop alternatives If you have a niche use case, this is the app for you. I will use it as my regular JSON viewer now

★★★★★ Lucio Ferro · Mar 16, 2026

This app works flawlessly! It effortlessly opens large JSON files without any issues. Highly recommended for anyone dealing with massive datasets!

★☆☆☆☆ Archer Dixon · Mar 24, 2026

Doesn't open simple json files. Possibly because it's 60 kb

Google Play Rankings for Giant JSON Viewer: HAR & API

This app is not ranked

Technologies used by Giant JSON Viewer: HAR & API

18 permissions

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