How to use JSON Reader Online
- Start by adding the JSON you want to process into JSON Reader Online.
- Set Expand so the output fits your use case.
- The result is computed live in your browser as you edit the input.
- When it looks right, Copy to save it.
About this tool
There is no server behind JSON Reader Online. JSON Reader Online validates and reshapes your JSON locally with no server round-trip.
Clear error positions help you find a stray comma or bracket quickly. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What is JSON Reader Online for?
JSON Reader Online lets you process your input right in the browser using the Expand control, with the result shown instantly and nothing uploaded.
Does JSON Reader Online cost anything?
No — JSON Reader Online is completely free, with no sign-up and no hidden limits.
Where is my data processed by JSON Reader Online?
Entirely in your browser — JSON Reader Online keeps your data on your own machine and sends nothing anywhere.
Can JSON Reader Online handle large or deeply nested JSON?
Yes. JSON Reader Online parses JSON entirely in your browser, so large or nested documents stay on your device and never upload.
Can I use JSON Reader Online without a connection?
Yes — after the first load JSON Reader Online runs entirely offline.