Open JSON files online
Read JSON as a tidy, collapsible tree — or as formatted text.
Drop your .json file here, or choose one
HEIC, RAR, ZIP, MSG, DOCX, PSD, EPUB and 80+ more
Choose fileOpened on your device — never uploaded
Supports .json, .geojson — and 80+ other formats.
About the format
What is a JSON file?
JSON is the data format behind most apps and APIs. Exported JSON is usually squashed onto a single line, which makes it unreadable without a viewer.
- Collapsible tree view
- Pretty-printed text
- Shows where invalid JSON breaks
- Nothing is uploaded — 100% private
- Free, no sign-up
How to
How to open a JSON file
- 1Choose your fileClick “Choose file” above, or drag your .json file anywhere onto the page.
- 2It opens instantlyYour browser reads it locally. Nothing is uploaded anywhere.
- 3Pretty-printed textDownload the result, or open another file whenever you like.
Convert
Convert JSON files
Batch convert in your browser — free, and nothing is uploaded.
Frequently asked questions
Everything happens in your browser, so most answers come down to: it's private, free and instant.
Is my file uploaded anywhere?
No. The file is opened by your own browser on your own device. Nothing is sent to a server, so it works for private and work files too.
Is it free?
Yes, completely free. No sign-up, no watermark, no limit on how many files you open.