JSON viewer and editor

Open, format, and compare JSON locally

Inspect JSON as editable source and as a structured preview, with formatting and semantic comparison tools available in the same browser workspace.

Open File ViewerChoose or paste JSON after the viewer opens.

What the JSON viewer supports

Syntax-aware source editing and formatting.
Structured preview with optional key sorting.
Text and semantic key-tree comparisons.
Local conversion and export options.

Privacy and limitations

Parsing and editing happen locally in the default flow. Invalid JSON is preserved for correction rather than silently rewritten, and large documents are limited by available browser memory.