JSON Viewer
JSON viewer, formatter and validator with collapsible tree, prettify and minify.
About JSON Viewer
JSON Viewer is a clean, offline developer tool that turns raw JSON into a collapsible tree you can actually read. Paste a payload, format it, validate it, and walk through it node by node — no login, no upload, no clutter.
Whether you are debugging an API response, inspecting a config file, or cleaning up a messy log dump, JSON Viewer gives you the parser, formatter, and tree explorer in one focused screen.
KEY FEATURES
• Tree view with collapse and expand at every level
• Syntax highlighting (keys blue, strings green, numbers orange, null and booleans red)
• Prettify with 2 or 4 space indent
• Minify to a single compact line
• Validate JSON with clear, line-aware error messages
• Paste from clipboard and copy results with one tap
• Adjustable font size from 10 to 24 pt
• Dark mode plus automatic system theme follow
• 37 languages with full RTL support for Arabic
• 100% offline, no account, no tracking, no analytics
WHO IT IS FOR
• Backend, frontend and full-stack developers
• Mobile engineers working with Android, iOS, Flutter, or React Native
• API integrators debugging REST and GraphQL responses
• Data analysts cleaning JSON exports and datasets
• DevOps and SRE engineers reading configs and structured logs
WHY THIS ONE
Privacy first. Every byte of JSON you paste stays on your device. Nothing is uploaded to a server, nothing is shared, nothing is logged.
No bloat. This is not a 50 MB IDE pretending to be a viewer. It launches fast, does JSON well, and stays out of your way.
Truly multilingual. The interface ships in 37 hand-localized languages, not machine-translated fragments, so the tool feels native wherever you work.
Supported by a single small banner ad to keep development sustainable. No paywall, no subscription, no upsell popups.
TYPICAL USE CASES
• Inspecting Stripe and PayPal webhook payloads
• Reading Firebase Remote Config and Firestore exports
• Debugging GraphQL and REST API responses
• Formatting messy server log JSON into something readable
• Reading package.json, tsconfig.json, and other project configs
Works with JSON from APIs, config files, package.json, tsconfig, Firebase, Stripe, GitHub, and any REST or GraphQL endpoint.
Install JSON Viewer and keep a proper JSON formatter, validator and tree explorer in your pocket.
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