File viewer
JSON Viewer
Paste or open a JSON file to validate it, inspect the tree, format it, minify it, and copy clean output locally in your browser.
Runs Locally
This tool runs in your browser. Files never leave your device.
Drag and drop a .json file here, or paste JSON text below.
Drop a JSON file anywhere inside this card to load it locally.
Tree view
Click objects to collapse"name": "FreeProTool"
"private": true
What this tool does
JSON Viewer opens a JSON file and lays it out as a clean, collapsible tree so you can actually read it. Expand and collapse objects and arrays, see the structure at a glance, and catch a missing bracket or stray comma without scrolling through one giant line. It formats, minifies, and validates as you go.
How it works
Paste your JSON or open a file, and the viewer parses it in your browser and renders a readable, foldable view. Format it, minify it, or check it for errors right there. Nothing is uploaded.
When to use JSON Viewer
Reading an API response that came back as one long line
Exploring the shape of an unfamiliar JSON file
Finding the syntax error in a config that will not parse
Collapsing a big object to focus on one part