Giant JSON Viewer: HAR & API

1.9.1

Kotysoft

3.73

52 reviews

5,000+
Downloads

Free

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

Giant JSON Viewer: HAR & API Screenshot 1 of 7

Giant JSON Viewer: HAR & API Screenshot 2 of 7

Giant JSON Viewer: HAR & API Screenshot 3 of 7

Giant JSON Viewer: HAR & API Screenshot 4 of 7

Giant JSON Viewer: HAR & API Screenshot 5 of 7

Giant JSON Viewer: HAR & API Screenshot 6 of 7

Giant JSON Viewer: HAR & API Screenshot 7 of 7

3.73 · 52 reviews · 5,000+ downloads

About Giant JSON Viewer: HAR & API

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

Download Statistics

Giant JSON Viewer: HAR & API has been downloaded 6.7 thousand times. In the last 30 days, the app was downloaded 580 times.

User Ratings

Giant JSON Viewer: HAR & API is rated 3.73 out of 5 stars. The rating is based on 52 ratings.

App Information

Giant JSON Viewer: HAR & API is FREE to download. The APK download size is 19.29 MB. The latest version available is 1.9.1. The last update was on August 10, 2026.

Technical Requirements

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 (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

Recent changes:
JsonDIFF export report

Show more Show less

More data about Giant JSON Viewer: HAR & API

Price	Free to download
Total downloads	6.7 thousand
Recent downloads	580
Rating	3.73 based on 52 ratings
Ranking	Not ranked
Version	1.9.1
APK size	19.3 MB
Number of libraries	?
Suitable for	Everyone
Ads	NO ads

App Performance Report

Get a detailed PDF report for Giant JSON Viewer: HAR & API with download trends, rating history, and key performance statistics — useful for competitive research or tracking your own app. Learn more

Get PDF Report — $29

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 Ndjson Multi Cloud Memory Filter Markdown Mode Basic Request Size Large Analyzer Analysis Toolkit Crash Md Gb Responses Account Limits Viewers Native Rust Handle Developer Simd Navigation Speed Sql Csv Queries Json Files Viewer Data File Open Built Directly Support Text View Device

Keywords missing from this app

Pdf App User Editor Storage Edit Xml Zip Reader Feature Manager Search Create Recent Opener Format Convert Share Read Genie Jl Easily Tool Work Delete Image Rar Extractor Archives Converted Easy Access Tree Lets Fast Formatter Browse Documents

Google Play Rating history and histogram

Rating history

Subscribe to see the full rating timeline

Downloads over time

Subscribe to see download velocity and history

Giant JSON Viewer: HAR & API has been downloaded 6.7 thousand times. Over the past 30 days, it averaged 19 downloads per day.

Changelog of Giant JSON Viewer: HAR & API

Show changelog

Developer information for Kotysoft

Kotysoft

support@giantjson.com

Website

Legal name:

Address:

Are you the developer of this app? Join us for free to see more information about your app and learn how we can help you promote and earn money with your app.

I'm the developer of this app

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!

★★★★★ 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!

★★★★★ 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

★☆☆☆☆ 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

Subscribe to see full permission and library details

Popular Tools Apps Apps on sale Apps other people are watching Today's trending apps Top new apps

AppBrain is a directory focused on discovering great apps and games. We give statistics, rankings and search options that Google Play and the App Store don't have. All trademarks are owned by their respective owners. AppBrain doesn't offer APKs or binaries, and always lets users install the official version from Google Play or the App Store.

More apps