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Add comprehensive environment variable and Firebase Admin debug endpoints
Created two debug endpoints to troubleshoot the Firebase Admin issue: 1. /api/debug/env-check - Shows all environment variables and their status 2. /api/debug/firebase-test - Step-by-step Firebase Admin initialization test These will help identify exactly why Firebase Admin ID token verification is failing even though the environment variables are set in Vercel.
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‎app/api/debug/env-check/route.ts‎

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import { NextRequest, NextResponse } from 'next/server';
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/**
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* Debug endpoint to check what environment variables are actually available
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* This helps debug environment variable issues in Vercel
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*/
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export async function GET(request: NextRequest) {
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try {
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console.log('[Env Check] Environment variables debug endpoint called');
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const envCheck = {
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timestamp: new Date().toISOString(),
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environment: {
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nodeEnv: process.env.NODE_ENV,
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vercelEnv: process.env.VERCEL_ENV,
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},
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googleCloudVars: {
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hasGoogleCloudKeyBase64: !!process.env.GOOGLE_CLOUD_KEY_BASE64,
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hasGoogleCloudKeyJson: !!process.env.GOOGLE_CLOUD_KEY_JSON,
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hasGoogleCloudCredentials: !!process.env.GOOGLE_CLOUD_CREDENTIALS,
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hasLoggingCloudKeyJson: !!process.env.LOGGING_CLOUD_KEY_JSON,
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googleCloudKeyJsonLength: process.env.GOOGLE_CLOUD_KEY_JSON?.length || 0,
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loggingCloudKeyJsonLength: process.env.LOGGING_CLOUD_KEY_JSON?.length || 0,
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googleCloudKeyJsonPreview: process.env.GOOGLE_CLOUD_KEY_JSON?.substring(0, 50) + '...',
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loggingCloudKeyJsonPreview: process.env.LOGGING_CLOUD_KEY_JSON?.substring(0, 50) + '...'
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},
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firebaseVars: {
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hasFirebaseProjectId: !!process.env.FIREBASE_PROJECT_ID,
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hasNextPublicFirebasePid: !!process.env.NEXT_PUBLIC_FIREBASE_PID,
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firebaseProjectId: process.env.FIREBASE_PROJECT_ID,
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nextPublicFirebasePid: process.env.NEXT_PUBLIC_FIREBASE_PID,
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hasFirebasePrivateKey: !!process.env.FIREBASE_PRIVATE_KEY,
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hasFirebaseClientEmail: !!process.env.FIREBASE_CLIENT_EMAIL
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},
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allEnvVarsStartingWithGoogle: Object.keys(process.env)
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.filter(key => key.toLowerCase().includes('google') || key.toLowerCase().includes('cloud'))
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.map(key => ({
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key,
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hasValue: !!process.env[key],
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length: process.env[key]?.length || 0
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})),
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allEnvVarsStartingWithFirebase: Object.keys(process.env)
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.filter(key => key.toLowerCase().includes('firebase'))
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.map(key => ({
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key,
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hasValue: !!process.env[key],
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length: process.env[key]?.length || 0
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}))
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};
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// Try to parse the Google Cloud JSON to see if it's valid
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if (process.env.GOOGLE_CLOUD_KEY_JSON) {
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try {
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let jsonString = process.env.GOOGLE_CLOUD_KEY_JSON;
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// Check if it's base64 encoded
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if (!jsonString.includes(' ') && !jsonString.startsWith('{')) {
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try {
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jsonString = Buffer.from(jsonString, 'base64').toString('utf-8');
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envCheck.googleCloudVars.isBase64Encoded = true;
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} catch (e) {
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envCheck.googleCloudVars.base64DecodeError = e.message;
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}
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}
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const parsed = JSON.parse(jsonString);
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envCheck.googleCloudVars.jsonParseSuccess = true;
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envCheck.googleCloudVars.parsedFields = {
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hasProjectId: !!parsed.project_id,
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hasPrivateKey: !!parsed.private_key,
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hasClientEmail: !!parsed.client_email,
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projectId: parsed.project_id,
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clientEmail: parsed.client_email
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};
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} catch (parseError) {
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envCheck.googleCloudVars.jsonParseError = parseError.message;
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}
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}
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return NextResponse.json(envCheck, {
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status: 200,
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headers: {
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'Cache-Control': 'no-cache, no-store, must-revalidate'
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}
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});
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} catch (error) {
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console.error('[Env Check] Error:', error);
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return NextResponse.json({
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error: 'Failed to check environment variables',
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details: error instanceof Error ? error.message : 'Unknown error',
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timestamp: new Date().toISOString()
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}, { status: 500 });
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}
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}

‎app/api/debug/firebase-test/route.ts‎

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import { NextRequest, NextResponse } from 'next/server';
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/**
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* Debug endpoint to test Firebase Admin initialization step by step
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*/
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export async function GET(request: NextRequest) {
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try {
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console.log('[Firebase Test] Starting Firebase Admin test...');
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const testResults = {
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timestamp: new Date().toISOString(),
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steps: []
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};
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// Step 1: Check environment variables
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testResults.steps.push({
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step: 1,
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name: 'Environment Variables Check',
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success: true,
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data: {
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hasGoogleCloudKeyJson: !!process.env.GOOGLE_CLOUD_KEY_JSON,
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hasLoggingCloudKeyJson: !!process.env.LOGGING_CLOUD_KEY_JSON,
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nodeEnv: process.env.NODE_ENV,
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vercelEnv: process.env.VERCEL_ENV
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}
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});
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// Step 2: Try to parse service account JSON
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let serviceAccount = null;
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try {
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if (process.env.GOOGLE_CLOUD_KEY_JSON) {
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let jsonString = process.env.GOOGLE_CLOUD_KEY_JSON;
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// Handle base64 encoding
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if (!jsonString.includes(' ') && !jsonString.startsWith('{')) {
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jsonString = Buffer.from(jsonString, 'base64').toString('utf-8');
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}
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serviceAccount = JSON.parse(jsonString);
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testResults.steps.push({
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step: 2,
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name: 'Service Account JSON Parse',
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success: true,
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data: {
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projectId: serviceAccount.project_id,
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clientEmail: serviceAccount.client_email,
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hasPrivateKey: !!serviceAccount.private_key,
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privateKeyLength: serviceAccount.private_key?.length || 0
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}
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});
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} else {
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throw new Error('No GOOGLE_CLOUD_KEY_JSON found');
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}
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} catch (error) {
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testResults.steps.push({
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step: 2,
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name: 'Service Account JSON Parse',
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success: false,
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error: error.message
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});
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return NextResponse.json(testResults, { status: 200 });
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}
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// Step 3: Try to initialize Firebase Admin
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try {
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const admin = await import('firebase-admin');
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// Check if already initialized
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if (admin.apps.length > 0) {
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testResults.steps.push({
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step: 3,
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name: 'Firebase Admin Already Initialized',
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success: true,
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data: {
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appsCount: admin.apps.length,
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projectId: admin.apps[0]?.options?.projectId
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}
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});
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} else {
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// Try to initialize
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const app = admin.initializeApp({
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credential: admin.credential.cert(serviceAccount),
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databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL || 'https://wewrite-ccd82-default-rtdb.firebaseio.com'
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});
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testResults.steps.push({
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step: 3,
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name: 'Firebase Admin Initialization',
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success: true,
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data: {
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projectId: app.options.projectId,
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databaseURL: app.options.databaseURL
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}
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});
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}
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// Step 4: Try to get Auth instance
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const auth = admin.auth();
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testResults.steps.push({
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step: 4,
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name: 'Firebase Admin Auth Instance',
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success: true,
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data: {
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hasAuth: !!auth,
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authType: typeof auth
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}
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});
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// Step 5: Try to create a test token (this will fail but shows if auth works)
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try {
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const testToken = await auth.createCustomToken('test-uid');
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testResults.steps.push({
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step: 5,
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name: 'Test Token Creation',
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success: true,
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data: {
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tokenLength: testToken.length
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}
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});
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} catch (tokenError) {
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testResults.steps.push({
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step: 5,
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name: 'Test Token Creation',
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success: false,
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error: tokenError.message,
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note: 'This might fail but shows if auth instance works'
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});
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}
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} catch (error) {
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testResults.steps.push({
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step: 3,
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name: 'Firebase Admin Initialization',
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success: false,
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error: error.message,
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stack: error.stack
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});
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}
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return NextResponse.json(testResults, {
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status: 200,
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headers: {
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'Cache-Control': 'no-cache, no-store, must-revalidate'
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}
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});
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} catch (error) {
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console.error('[Firebase Test] Error:', error);
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return NextResponse.json({
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error: 'Firebase test failed',
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details: error instanceof Error ? error.message : 'Unknown error',
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timestamp: new Date().toISOString()
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}, { status: 500 });
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}
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}

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