Supabase debug bundle

Supabase Debug Bundle

Overview

Collect a comprehensive, redacted diagnostic bundle from a Supabase project. Tests connectivity, auth, Realtime, Storage, RLS policy behavior, and database health — then packages everything into a single archive safe for sharing with Supabase support.

Current State

!node --version 2>/dev/null || echo 'Node.js not found' !npx supabase --version 2>/dev/null || echo 'Supabase CLI not found' !npm list @supabase/supabase-js 2>/dev/null | grep supabase || echo '@supabase/supabase-js not installed'

Prerequisites

• Node.js 18+ with @supabase/supabase-js v2 installed in the project
• Supabase CLI installed (npm i -g supabase or npx supabase)
• Environment variables set: SUPABASE_URL and SUPABASE_ANON_KEY (minimum); SUPABASE_SERVICE_ROLE_KEY for full diagnostics
• Project linked via supabase link --project-ref <ref> (for CLI commands)

Instructions

Step 1: Gather Environment and Connectivity

Collect SDK version, project URL, key type, and test basic connectivity against the REST and Auth endpoints.

import { createClient } from '@supabase/supabase-js'

const url = process.env.SUPABASE_URL!
const anonKey = process.env.SUPABASE_ANON_KEY!
const serviceKey = process.env.SUPABASE_SERVICE_ROLE_KEY

// Identify which key is in use
const keyType = serviceKey ? 'service_role' : 'anon'
const supabase = createClient(url, serviceKey ?? anonKey, {
  auth: { autoRefreshToken: false, persistSession: false }
})

const diagnostics: Record<string, unknown> = {}

// 1a — SDK + environment
diagnostics.environment = {
  supabase_js_version: require('@supabase/supabase-js/package.json').version,
  node_version: process.version,
  project_url: url.replace(/https:\/\/([^.]+)\..*/, 'https://$1.***'),
  key_type: keyType,
  timestamp: new Date().toISOString(),
}

// 1b — REST API connectivity
const restStart = Date.now()
const restRes = await fetch(`${url}/rest/v1/`, {
  headers: { apikey: anonKey, Authorization: `Bearer ${anonKey}` },
})
diagnostics.rest_api = {
  status: restRes.status,
  latency_ms: Date.now() - restStart,
  ok: restRes.ok,
}

// 1c — Auth health
const authStart = Date.now()
const { data: sessionData, error: sessionErr } = await supabase.auth.getSession()
diagnostics.auth = {
  status: sessionErr ? `error: ${sessionErr.message}` : 'ok',
  has_session: !!sessionData?.session,
  latency_ms: Date.now() - authStart,
}

// 1d — Database connectivity probe
const dbStart = Date.now()
const { error: dbErr } = await supabase.from('_test_ping').select('*').limit(1)
diagnostics.database = {
  // 42P01 = table doesn't exist, which proves the connection works
  status: (!dbErr || dbErr.code === '42P01') ? 'connected' : `error: ${dbErr.code}`,
  latency_ms: Date.now() - dbStart,
}

console.log(JSON.stringify(diagnostics, null, 2))

What to check: REST API should return 200. Auth should return ok. Database probe returning 42P01 (relation not found) is normal — it confirms the PostgREST connection works.

Step 2: Test Realtime, Storage, and RLS

Probe the three subsystems that cause the most support tickets.

// 2a — Realtime subscription test
const realtimeResult = await new Promise<Record<string, unknown>>((resolve) => {
  const timeout = setTimeout(() => {
    resolve({ status: 'timeout', detail: 'No SUBSCRIBED event within 5s' })
  }, 5000)

  const channel = supabase.channel('debug-probe')
  channel.subscribe((status) => {
    if (status === 'SUBSCRIBED') {
      clearTimeout(timeout)
      channel.unsubscribe()
      resolve({ status: 'ok', detail: 'Channel subscribed successfully' })
    } else if (status === 'CHANNEL_ERROR') {
      clearTimeout(timeout)
      channel.unsubscribe()
      resolve({ status: 'error', detail: 'CHANNEL_ERROR on subscribe' })
    }
  })
})
diagnostics.realtime = realtimeResult

// 2b — Storage bucket listing
const { data: buckets, error: storageErr } = await supabase.storage.listBuckets()
diagnostics.storage = {
  status: storageErr ? `error: ${storageErr.message}` : 'ok',
  bucket_count: buckets?.length ?? 0,
  buckets: buckets?.map((b) => ({ name: b.name, public: b.public })) ?? [],
}

// 2c — RLS comparison: anon vs service_role
// Query the same table with both key types to detect RLS misconfiguration
if (serviceKey) {
  const anonClient = createClient(url, anonKey, {
    auth: { autoRefreshToken: false, persistSession: false },
  })
  // Pick the first public table from pg_tables (or fall back)
  const { data: tables } = await supabase
    .from('information_schema.tables' as any)
    .select('table_name')
    .eq('table_schema', 'public')
    .limit(1)

  const testTable = tables?.[0]?.table_name
  if (testTable) {
    const { count: anonCount } = await anonClient
      .from(testTable)
      .select('*', { count: 'exact', head: true })
    const { count: serviceCount } = await supabase
      .from(testTable)
      .select('*', { count: 'exact', head: true })
    diagnostics.rls = {
      table: testTable,
      anon_visible_rows: anonCount ?? 0,
      service_role_visible_rows: serviceCount ?? 0,
      rls_active: (anonCount ?? 0) !== (serviceCount ?? 0),
    }
  } else {
    diagnostics.rls = { status: 'skipped', detail: 'No public tables found' }
  }
} else {
  diagnostics.rls = { status: 'skipped', detail: 'No service_role key — cannot compare' }
}

What to check: Realtime should reach SUBSCRIBED within 5 seconds. Storage should list buckets without error. RLS comparison showing identical row counts for anon and service_role on a table you expect to be protected means RLS policies may be missing.

Step 3: Collect Database Health and Package the Bundle

Pull database statistics via the Supabase CLI inspect commands and the platform status page, then archive everything.

#!/bin/bash
set -euo pipefail

BUNDLE_DIR="supabase-debug-$(date +%Y%m%d-%H%M%S)"
mkdir -p "$BUNDLE_DIR"

# 3a — Supabase CLI status (local dev)
npx supabase status > "$BUNDLE_DIR/cli-status.txt" 2>&1 || echo "CLI status unavailable (not linked or no local dev)" > "$BUNDLE_DIR/cli-status.txt"

# 3b — Database inspection via CLI
npx supabase inspect db table-sizes   > "$BUNDLE_DIR/table-sizes.txt"   2>&1 || true
npx supabase inspect db index-usage   > "$BUNDLE_DIR/index-usage.txt"   2>&1 || true
npx supabase inspect db cache-hit     > "$BUNDLE_DIR/cache-hit.txt"     2>&1 || true
npx supabase inspect db seq-scans     > "$BUNDLE_DIR/seq-scans.txt"     2>&1 || true
npx supabase inspect db long-running-queries > "$BUNDLE_DIR/long-queries.txt" 2>&1 || true
npx supabase inspect db bloat         > "$BUNDLE_DIR/bloat.txt"         2>&1 || true
npx supabase inspect db replication-slots > "$BUNDLE_DIR/replication.txt" 2>&1 || true

# 3c — Platform status page
curl -sf https://status.supabase.com/api/v2/status.json \
  | python3 -m json.tool > "$BUNDLE_DIR/platform-status.json" 2>/dev/null \
  || echo '{"error": "Could not reach status.supabase.com"}' > "$BUNDLE_DIR/platform-status.json"

# 3d — Redact secrets from all collected files
find "$BUNDLE_DIR" -type f -exec sed -i \
  -e 's/eyJ[A-Za-z0-9_-]\{20,\}\(\.[A-Za-z0-9_-]*\)*/[JWT_REDACTED]/g' \
  -e 's/sbp_[A-Za-z0-9]\{20,\}/[SBP_KEY_REDACTED]/g' \
  -e 's/[A-Za-z0-9._%+-]\+@[A-Za-z0-9.-]\+\.[A-Za-z]\{2,\}/[EMAIL_REDACTED]/g' {} +

# 3e — Package
tar czf "${BUNDLE_DIR}.tar.gz" "$BUNDLE_DIR"
echo "Debug bundle created: ${BUNDLE_DIR}.tar.gz"
echo "Contents:"
ls -lh "$BUNDLE_DIR"/

What to check: Review cache-hit.txt — index and table hit rates below 99% indicate memory pressure. bloat.txt values above 50% on large tables warrant a VACUUM. seq-scans.txt highlights tables needing indexes.

Output

The skill produces supabase-debug-YYYYMMDD-HHMMSS.tar.gz containing:

File	Contents
cli-status.txt	Local Supabase stack status (services, ports, URLs)
table-sizes.txt	All tables with row counts and disk usage
index-usage.txt	Index scan frequency — unused indexes are candidates for removal
cache-hit.txt	Buffer cache and index cache hit ratios
seq-scans.txt	Tables with high sequential scan counts (missing indexes)
long-queries.txt	Currently running queries over the duration threshold
bloat.txt	Table and index bloat percentages
replication.txt	Replication slot status (relevant for Realtime)
platform-status.json	Supabase platform health from status.supabase.com

Plus the TypeScript diagnostics output (connectivity, auth, Realtime, Storage, RLS) printed to stdout.

All JWT tokens, Supabase project keys (sbp_*), and email addresses are automatically redacted before archiving.

Error Handling

Symptom	Cause	Fix
REST API returns 401	Invalid or expired anon key	Regenerate key in Dashboard > Settings > API
REST API returns 000 or times out	Wrong SUPABASE_URL or project paused	Verify URL; unpause project in Dashboard
Realtime returns CHANNEL_ERROR	WebSocket blocked by firewall/proxy	Check corporate proxy; try from a different network
Realtime times out (5s)	Realtime addon not enabled or quota hit	Enable Realtime on the table in Dashboard > Database > Replication
Storage listBuckets returns 403	RLS enabled on storage without policy	Add a storage policy or use service_role key
supabase inspect db fails	CLI not linked to remote project	Run supabase link --project-ref <ref> first
cache-hit below 95%	Database instance too small for workload	Upgrade compute size or optimize queries
RLS shows identical counts	No RLS policies on the table	Add policies via ALTER TABLE ... ENABLE ROW LEVEL SECURITY
pg_stat_statements not available	Extension not enabled	Enable in Dashboard > Database > Extensions

Examples

Quick connectivity check (no service key needed):

import { createClient } from '@supabase/supabase-js'

const supabase = createClient(process.env.SUPABASE_URL!, process.env.SUPABASE_ANON_KEY!)

const start = Date.now()
const { error } = await supabase.from('any_table').select('*').limit(1)
console.log({
  connected: !error || error.code === '42P01',
  latency_ms: Date.now() - start,
  error: error?.message ?? null,
})

API endpoint test with curl:

curl -s -o /dev/null -w "HTTP %{http_code} in %{time_total}s\n" \
  "https://<project-ref>.supabase.co/rest/v1/" \
  -H "apikey: $SUPABASE_ANON_KEY"

Check auth session from a running app:

const { data, error } = await supabase.auth.getSession()
if (error) console.error('Auth error:', error.message)
else if (!data.session) console.log('No active session (user not logged in)')
else console.log('Session valid, expires:', data.session.expires_at)

Resources

• Supabase Troubleshooting Guide — official first-stop for common issues
• Database Inspect (CLI) — supabase inspect db command reference
• Supabase Status Page — live platform health
• Supabase Support — file a ticket with your debug bundle attached
• RLS Guide — row-level security policy authoring
• Realtime Quotas — connection and message limits

Next Steps

• Run supabase-common-errors to match diagnostic output against known issue patterns
• Run supabase-rate-limits if the bundle reveals 429 responses or throttled connections
• Run supabase-performance-tuning if cache hit ratios are below 99% or sequential scans are high
• Run supabase-observability to set up ongoing monitoring so issues surface before they become tickets