Parse and Repair JSON

Copy a payload, then run:

leo json

By default, the command reads the clipboard and opens an interactive terminal view of JSON with two-space indentation. You can also pass a payload directly or use piped or redirected input:

leo json "{'name': 'Leo', 'active': True, 'value': None}"
cat payload.txt | leo json
leo json < payload.txt

Input precedence is: command argument, stdin, then clipboard. An explicitly empty argument or pipe returns an error instead of falling back to the clipboard.

The Python dict above produces:

{
  "active": true,
  "name": "Leo",
  "value": null
}

Common repairs include single quotes, unquoted keys, True / False / None, trailing commas, comments, missing commas or colons, incomplete brackets or quotes, Markdown code fences, and newline-delimited JSON. Multiple JSON documents become an array.

Outer JSON strings and Python string representations are automatically unwrapped, including multiple encoding layers. Each input below produces {"ok": true}:

{'ok': True}
"{\"ok\": true}"
'{"ok": true}'
{\"ok\": true}

Only the outer payload is unwrapped. Strings inside object fields remain strings. Large integers and decimals never pass through floating-point conversion, and Unicode escapes are displayed as readable characters.

Log Extraction and Deeper Parsing

Paste a log with its prefix intact:

im_service.send_message send message to im: 123, {"Content":"{\"text\":\"system message\"}","Ext":{"mc:ext_json":"{\"message_type\":1}"}}

The command extracts the object. Initially, both Content and Ext["mc:ext_json"] remain strings. Expandable string paths appear below the JSON view. The footer shows clickable key bindings with Chinese action labels and wraps on narrow terminals:

• Up / Down or Tab: select a string field.
• Enter: parse only the selected string into an object or array. Deeper strings retain their types.
• u: undo the most recent parse and restore the original string.
• PageUp / PageDown or the mouse wheel: scroll JSON. Left / Right: scroll long lines horizontally.
• c / C: copy the current JSON, including manually parsed fields. A confirmation appears on success.
• q: finish viewing and print the current JSON to stdout.
• Esc / Ctrl+C: exit without printing or automatically copying the result.

New JSON strings become selectable after each expansion. Ordinary text and numeric strings are not expansion targets.

JSON-like strings that cannot be repaired remain selectable with an [invalid] marker. Enter displays the parse error and preserves the original string. Repair can remove an extra ] or } with no matching opener. Brackets inside strings remain unchanged, and objects are not automatically converted to arrays.

Output Options

leo json --compact
leo json --plain
leo json --copy
leo json --compact --copy
leo json --interactive > expanded.json

--compact (-c) prints one-line JSON directly. --plain prints indented JSON directly. --copy also copies the result after the viewer finishes; clipboard writes require an explicit copy action.

Piped or redirected output skips the viewer by default. --interactive (-i) forces the viewer and writes the current JSON to the redirected destination when done. The viewer uses a separate terminal, so stdout contains only JSON:

leo json > repaired.json

Repair uses the Go jsonrepair library, requires no Python installation, and never executes input as code. It infers intent from syntax, cannot guarantee recovery of the original meaning, and is not a complete Python expression parser. Empty input or content from which JSON cannot be parsed, repaired, or extracted displays 内容里没有 JSON (“No JSON found in the content”) and exits with a nonzero status, without opening the viewer, writing a result, or overwriting the clipboard.