JSON Viewer

How to use the json viewer

1. Paste your JSON.
2. Use the depth slider to control how much is expanded.
3. Click any branch to open or close it.

About this tool

Formatting JSON helps up to a point; past a few hundred lines, indentation stops being enough and you need to collapse the parts you are not looking at. A tree does that.

The depth slider is the useful control on a large document — set it to 1 or 2 to see the overall shape, then open only the branch you care about. Node count and maximum depth are reported too, which tells you quickly whether a response is genuinely large or merely deeply nested.

When the JSON does not parse, the error is reported with a line and column where the browser provides one. Where it does not, the raw message is shown rather than a guessed position — a confidently wrong line number is worse than none.

Everything happens in the page. JSON commonly carries API keys, personal records and internal identifiers, so nothing here is uploaded, logged or sent to a server — which is exactly why a browser tool is the right place to inspect it.

Common uses

• Inspecting a large API response.
• Finding where a value sits in a deeply nested document.
• Checking the shape of unfamiliar JSON.

Frequently asked questions

Is my JSON uploaded?

No. It is parsed and rendered in the page on your device, which matters because JSON so often contains keys and personal data.

Why does the error not always give a line number?

Browsers report the position for most syntax errors but not all. Where the position is not given, the message is shown without one rather than guessing.

How large a document can it handle?

It is limited by your device's memory rather than any fixed cap. Multi-megabyte documents work, though very large ones render slowly.