claudbg/.beans/claudbg-pfa5--json-output-is-array-of-arrays-instead-of-array-of.md

title	status	type	priority	created_at	updated_at	parent
JSON output is array-of-arrays instead of array-of-objects	todo	bug	normal	2026-03-30T04:37:05Z	2026-03-30T04:41:14Z	claudbg-tci9

Problem

sessions list --output json and sessions dump --output json serialize rows as Vec<Vec<String>>, producing an array of arrays with no field names:

[["21fae0a8", "2024-01-01", "/path", "claude-3", "42"], ...]

Expected behavior

Output should be an array of objects with named keys:

[{"id": "21fae0a8", "date": "2024-01-01", "project": "/path", "model": "claude-3", "messages": 42, "subagents": 0}, ...]

Affected commands

• sessions list --output json: keys should be id, date, project, model, messages, subagents
• sessions dump --output json: keys should be seq, timestamp, type, role, content

Root cause

src/commands/sessions.rs passes &rows: &Vec<Vec<String>> directly to render_json. The fix is to build a typed struct or serde_json::Value map per row before serializing.

Relevant files

• src/commands/sessions.rs — list() and dump() JSON output branches
• src/output/json.rs — generic render_json