Works with Home Assistant WebSocket API, Python websocket library, and YAML configurations.

Home Assistant Error Checking and Validation

Debug and validate Home Assistant dashboards, configurations, and entity usage programmatically.

Quick Start

Use the automation script for fast dashboard validation:

python ~/.claude/skills/ha-error-checking/scripts/check_dashboard.py climate-control

Or use the Quick Start workflow below for custom checks.

Quick Start Workflow

import json
import websocket
import os

HA_URL = "http://192.168.68.123:8123"
HA_TOKEN = os.environ["HA_LONG_LIVED_TOKEN"]

def check_dashboard_errors(url_path: str):
    """Check for errors in a specific dashboard."""
    ws_url = HA_URL.replace("http://", "ws://") + "/api/websocket"
    ws = websocket.create_connection(ws_url)
    msg_id = 1

    # 1. Auth
    ws.recv()
    ws.send(json.dumps({"type": "auth", "access_token": HA_TOKEN}))
    ws.recv()

    # 2. Check system logs for lovelace errors
    ws.send(json.dumps({"id": msg_id, "type": "system_log/list"}))
    msg_id += 1
    logs = json.loads(ws.recv())

    lovelace_errors = [
        log for log in logs.get("result", [])
        if "lovelace" in log.get("name", "").lower()
        or "frontend" in log.get("name", "").lower()
    ]

    # 3. Validate dashboard config
    ws.send(json.dumps({
        "id": msg_id,
        "type": "lovelace/config",
        "url_path": url_path
    }))
    msg_id += 1
    config_response = json.loads(ws.recv())

    # 4. Get all entity states
    ws.send(json.dumps({"id": msg_id, "type": "get_states"}))
    msg_id += 1
    states_response = json.loads(ws.recv())

    ws.close()

    return {
        "lovelace_errors": lovelace_errors,
        "config": config_response.get("result"),
        "available_entities": [s["entity_id"] for s in states_response.get("result", [])]
    }

Usage

Follow these steps to debug Home Assistant dashboard errors:

1. Check system logs for lovelace/frontend errors
2. Validate dashboard config exists and is properly formatted
3. Verify entity IDs exist in Home Assistant
4. Check HACS cards are installed before use
5. Validate card configurations for known issues (ApexCharts span, URL paths)

System Logs - Check for Errors

Get All System Logs

ws.send(json.dumps({"id": 1, "type": "system_log/list"}))
response = json.loads(ws.recv())

logs = response.get("result", [])
# Structure: [{"name": "homeassistant.components.lovelace", "message": "...", "level": "ERROR", ...}, ...]

Filter for Lovelace/Frontend Errors

lovelace_errors = [
    log for log in logs
    if "lovelace" in log.get("name", "").lower()
    or "frontend" in log.get("name", "").lower()
]

for error in lovelace_errors:
    print(f"[{error['level']}] {error['name']}: {error['message']}")

Dashboard Configuration Validation

Get Dashboard Config

ws.send(json.dumps({
    "id": 1,
    "type": "lovelace/config",
    "url_path": "climate-control"  # Must contain hyphen
}))
response = json.loads(ws.recv())

config = response.get("result")
# Returns the full dashboard configuration dict

Validate Dashboard Exists

ws.send(json.dumps({"id": 1, "type": "lovelace/dashboards/list"}))
response = json.loads(ws.recv())

dashboards = response.get("result", [])
dashboard_paths = [d["url_path"] for d in dashboards]

if "climate-control" in dashboard_paths:
    print("Dashboard exists")
else:
    print("Dashboard not found")

Check Dashboard URL Path Format

CRITICAL: Dashboard URL paths must contain a hyphen.

def validate_url_path(url_path: str) -> tuple[bool, str]:
    """Validate dashboard URL path format.

    Returns:
        (is_valid, error_message)
    """
    if "-" not in url_path:
        return False, f"URL path must contain hyphen: '{url_path}' -> '{url_path}-view'"

    if " " in url_path:
        return False, f"URL path cannot contain spaces: '{url_path}'"

    if not url_path.islower():
        return False, f"URL path must be lowercase: '{url_path}'"

    return True, ""

# Examples
validate_url_path("climate")         # ❌ (False, "URL path must contain hyphen...")
validate_url_path("climate-control") # ✅ (True, "")
validate_url_path("Climate-Control") # ❌ (False, "URL path must be lowercase...")

Entity Validation

Get All Available Entities

ws.send(json.dumps({"id": 1, "type": "get_states"}))
response = json.loads(ws.recv())

entities = response.get("result", [])
entity_ids = [e["entity_id"] for e in entities]

# Group by domain
from collections import defaultdict
by_domain = defaultdict(list)
for entity_id in entity_ids:
    domain = entity_id.split(".")[0]
    by_domain[domain].append(entity_id)

print(f"Total entities: {len(entity_ids)}")
print(f"Sensors: {len(by_domain['sensor'])}")
print(f"Climate: {len(by_domain['climate'])}")

See

examples/examples.md

for entity extraction from dashboard configs and pattern matching.

HACS Card Installation Validation

Check if Card is Installed

def check_hacs_card_installed(ws, repository_id: int) -> bool:
    """Check if a HACS card is installed by repository ID."""
    ws.send(json.dumps({
        "id": 1,
        "type": "hacs/repositories/list"
    }))
    response = json.loads(ws.recv())

    repositories = response.get("result", [])
    installed = [r for r in repositories if r.get("id") == repository_id]

    return len(installed) > 0

# Known repository IDs
HACS_CARDS = {
    "mini-graph-card": 151280062,
    "bubble-card": 680112919,
    "modern-circular-gauge": 871730343,
    "lovelace-mushroom": 444350375,
    "apexcharts-card": 331701152,
}

# Check installation
if check_hacs_card_installed(ws, HACS_CARDS["apexcharts-card"]):
    print("ApexCharts card is installed")
else:
    print("ApexCharts card NOT installed - install via HACS first")

See

examples/examples.md

for programmatic HACS card installation.

Card Configuration Validation

Validate ApexCharts Span Configuration

CRITICAL:

span.end

must be one of: "minute", "hour", "day", "week", "month", "year", "isoWeek"

VALID_SPAN_END_VALUES = ["minute", "hour", "day", "week", "month", "year", "isoWeek"]

def validate_apexcharts_span(card_config: dict) -> tuple[bool, str]:
    """Validate ApexCharts span configuration.

    Returns:
        (is_valid, error_message)
    """
    if "span" not in card_config:
        return True, ""  # span is optional

    span = card_config["span"]
    if "end" not in span:
        return True, ""  # end is optional within span

    end_value = span["end"]
    if end_value not in VALID_SPAN_END_VALUES:
        return False, f"Invalid span.end: '{end_value}'. Must be one of: {VALID_SPAN_END_VALUES}"

    return True, ""

# Usage
apexcharts_card = {
    "type": "custom:apexcharts-card",
    "span": {"end": "now"}  # ❌ Invalid
}

is_valid, error = validate_apexcharts_span(apexcharts_card)
if not is_valid:
    print(f"Error: {error}")
    # Fix it
    apexcharts_card["span"]["end"] = "hour"  # ✅ Valid

Supporting Files

• examples/examples.md - Comprehensive workflows (complete dashboard validation, entity extraction, pattern matching, HACS installation, custom card validation)
• references/reference.md - Error patterns, known entity IDs, troubleshooting solutions, best practices
• scripts/check_dashboard.py - Automated dashboard validation script

Common Error Patterns

1. ApexCharts Span Error

Error:

"Invalid value for span.end: now"

Solution:

# WRONG
card = {
    "type": "custom:apexcharts-card",
    "span": {"end": "now"}  # ❌
}

# CORRECT
card = {
    "type": "custom:apexcharts-card",
    "span": {"end": "hour"}  # ✅
}

2. Dashboard URL Path Missing Hyphen

Error: Dashboard doesn't appear in sidebar

Solution:

# WRONG
url_path = "climate"  # ❌

# CORRECT
url_path = "climate-control"  # ✅

3. Entity Not Found

Error:

"Entity not found: sensor.temperature"

Solution:

# Check entity exists
all_entities = get_all_entity_ids(ws)
if "sensor.temperature" not in all_entities:
    print("Entity not found - check spelling in Developer Tools → States")

    # Find similar entities
    similar = [e for e in all_entities if "temperature" in e]
    print(f"Did you mean: {similar}")

See

references/reference.md

for complete error patterns, browser debugging steps, best practices, and troubleshooting checklist.

Notes

• Dashboard URL paths MUST contain a hyphen (e.g., "climate-control" not "climate")
• ApexCharts

  span.end

  only accepts: minute, hour, day, week, month, year, isoWeek
• HACS repository IDs: mini-graph-card (151280062), apexcharts-card (331701152)
• Check system logs after every dashboard update for errors
• Use Developer Tools → States to verify entity IDs before use