GiantJSON Viewer+ is an Android app for opening and exploring JSON files. Any JSON file. The tiny API response you want to quickly inspect. The 8 GB NDJSON log that just broke your editor. Everything in between — always prettified, always navigable.
Get it on Google Play — Free to tryThe core viewer is free — no time limit, no file size limit, no file count limit, no ads. Search, filter, navigate, and HAR analysis all work on the free tier forever. The advanced tools (SQL/CSV export, API client) are paid, but you can try everything before deciding.
It is not an editor. You cannot modify files. What you can do — with Pro — is export: filtered results to JSON, CSV, or SQL, with options to mask, rename, or drop fields before the data leaves the app.
Native Rust + SIMD engine under the hood. Streaming access, persistent index. Memory usage stays constant regardless of file size. Once a file is indexed, reopening is near-instant — even on multi-GB files.
Interactive tree view. Navigate objects and arrays like a feed. Infinite scroll, bookmarks, jump to any path.
Raw view with regex search, persistent highlights, and occurrence counter across the full file.
Visual schema graph. Understand the shape of an unfamiliar file without reading it line by line.
REST and GraphQL. OAuth 2.0 with PKCE, AWS Signature V4, Postman collection import. Every response opens directly in the viewer.
Open network recordings from Chrome DevTools or any proxy tool. Filter and inspect requests — timing breakdown, headers, response body, the works.
The app launched a few months ago. Since then, the core indexing engine has been rewritten once and reworked several more times — because when your users routinely open 10 GB log files, you find out fast what "edge case" really means.
Lots of bugs fixed. Lots of features added. Still going.
Detailed bug reports genuinely help. Thorough reports with reproduction steps have earned lifetime licence codes in the past. Leave your email if you want a response.