Viewer Namu

JSON Viewer – Open Online, No Install

Explore JSON files as a collapsible tree and search keys and values. If there is a syntax error, you get the line and column. Files are processed only in this browser and are never uploaded.

How it works

  1. 01Drop a fileDrag and drop it, or use the choose-file button.
  2. 02The format is detectedWe read the extension and take you to the right viewer.
  3. 03It opens in your browserNothing goes through a server, and the file is not stored.

Scope and limits

  • Large numbers (16+ digits) and key order are shown exactly as in the file. Values are never rounded or changed.
  • Only standard JSON is read. Comments, trailing commas, single quotes and NaN are reported as errors. JSON Lines (.jsonl) is not supported.
  • Arrays and objects are shown 100 at a time with a "show more" button. Files over 30 MB are not opened.
  • Read-only. Click a value to copy its path ($.a[0].b) or value.

FAQ

Is my JSON sent anywhere?

No. Everything stays in this browser.

How are syntax errors reported?

You get the line and column, the offending line, and hints for common mistakes (single quotes, comments, trailing commas, unquoted keys).

Can I see it pretty-printed?

Yes. Choose "Formatted text" to see it indented by two spaces.

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