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JSON

Edit and validate JSON, pretty-print it, and inspect it as a tree.

The JSON editor opens .json text files.

Interactive JSON editorFormat a payload or expand it as a collapsible tree. The real editor on an in-memory file — nothing is saved to a tray.

Views and actions

Section titled “Views and actions”
  • Edit provides syntax highlighting and live validation as you type.
  • Tree renders objects and arrays as an expandable structure. Double-click an object key to rename it, or a primitive value to edit it. Array indexes and object/array values themselves stay fixed in this first version.
  • Format pretty-prints valid JSON. On invalid JSON it briefly flags the problem instead of changing your text.

When editing a Tree value, numbers become JSON numbers, true and false become booleans, and null becomes null. Quoted input is a string; any other input is also kept as a string. Press Enter or click away to commit, or Escape to cancel.

Invalid JSON stays fully editable and produces a clear error rather than replacing or discarding the source, so a stray comma never loses your work.

Undo and redo

Section titled “Undo and redo”

Cmd/Ctrl+Z and Cmd/Ctrl+Shift+Z undo and redo across both views. See Getting started for the full model.