Nutlope
No database host or connection string was set
[ Server ] Error: No database host or connection string was set, and key parameters have default values (host: localhost, user: ubuntu, db: ubuntu, password: null). Is an environment variable missing? Alternatively, if you intended to connect with these parameters, please set the host to 'localhost' explicitly.
I'm encountering this error while running the app. The README does not provide any information about the database settings.
Same Issue -- [ Server ] Error: No database host or connection string was set, and key parameters have default values (host: localhost, user: chris, db: chris, password: null). Is an environment variable missing? Alternatively, if you intended to connect with these parameters, please set the host to 'localhost' explicitly.
Same Issue -- [ Server ] Error: No database host or connection string was set, and key parameters have default values (host: localhost, user: chris, db: chris, password: null). Is an environment variable missing? Alternatively, if you intended to connect with these parameters, please set the host to 'localhost' explicitly.
So I added a database string to the .env and got a new error !
Error: ErrorEvent
Call Stack 5
Hide 5 ignore-listed frame(s) resolveErrorDev node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js (1865:1) processFullStringRow node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js (2245:1) processFullBinaryRow node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js (2233:1) progress node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js (2479:1) ClientPageRoot ../src/client/components/client-page.tsx (60:12)
i hav same Erorr
`PS C:\IdeaProjects\llamacoder> npm install npm warn using --force Recommended protections disabled. npm warn ERESOLVE overriding peer dependency npm warn While resolving: @codesandbox/[email protected] npm warn Found: [email protected] npm warn node_modules/react npm warn react@"^19" from the root project npm warn 58 more (@floating-ui/react, @floating-ui/react-dom, ...) npm warn npm warn Could not resolve dependency: npm warn peer react@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project npm warn npm warn Conflicting peer dependency: [email protected] npm warn node_modules/react npm warn peer react@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project npm warn ERESOLVE overriding peer dependency npm warn While resolving: @codesandbox/[email protected] npm warn Found: [email protected] npm warn node_modules/react-dom npm warn react-dom@"^19" from the root project npm warn 25 more (@floating-ui/react, @floating-ui/react-dom, ...) npm warn npm warn Could not resolve dependency: npm warn peer react-dom@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project npm warn npm warn Conflicting peer dependency: [email protected] npm warn node_modules/react-dom npm warn peer react-dom@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project
[email protected] postinstall prisma generate
Environment variables loaded from .env Prisma schema loaded from prisma\schema.prisma
✔ Generated Prisma Client (v6.2.1) to .\node_modules@prisma\client in 43ms
Start by importing your Prisma Client (See: https://pris.ly/d/importing-client)
Tip: Interested in query caching in just a few lines of code? Try Accelerate today! https://pris.ly/tip-3-accelerate
up to date, audited 839 packages in 3s
226 packages are looking for funding
run npm fund for details
found 0 vulnerabilities PS C:\IdeaProjects\llamacoder> npm install npm warn using --force Recommended protections disabled. npm warn ERESOLVE overriding peer dependency npm warn While resolving: @codesandbox/[email protected] npm warn Found: [email protected] npm warn node_modules/react npm warn react@"^19" from the root project npm warn 58 more (@floating-ui/react, @floating-ui/react-dom, ...) npm warn npm warn Could not resolve dependency: npm warn peer react@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project npm warn npm warn Conflicting peer dependency: [email protected] npm warn node_modules/react npm warn peer react@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project npm warn ERESOLVE overriding peer dependency npm warn While resolving: @codesandbox/[email protected] npm warn Found: [email protected] npm warn node_modules/react-dom npm warn react-dom@"^19" from the root project npm warn 25 more (@floating-ui/react, @floating-ui/react-dom, ...) npm warn npm warn Could not resolve dependency: npm warn peer react-dom@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project npm warn npm warn Conflicting peer dependency: [email protected] npm warn node_modules/react-dom npm warn peer react-dom@"^16.8.0 || ^17 || ^18" from @codesandbox/[email protected] npm warn node_modules/@codesandbox/sandpack-react npm warn @codesandbox/sandpack-react@"^2.19.10" from the root project
[email protected] postinstall prisma generate
Environment variables loaded from .env Prisma schema loaded from prisma\schema.prisma
✔ Generated Prisma Client (v6.2.1) to .\node_modules@prisma\client in 45ms
Start by importing your Prisma Client (See: https://pris.ly/d/importing-client)
Tip: Need your database queries to be 1000x faster? Accelerate offers you that and more: https://pris.ly/tip-2-accelerate
up to date, audited 839 packages in 3s
226 packages are looking for funding
run npm fund for details`
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Purpose of This File This file is responsible for exporting a single instance of the Prisma Client, which is used to interact with your PostgreSQL database. It also ensures that the correct connection method is used depending on whether your app is running locally (development) or in a serverless/production environment (like Vercel with Neon).
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Why Different Logic for Production and Development? Production/Serverless (e.g., Vercel, Cloudflare):
Uses the Neon serverless adapter for Prisma. Neon requires a special WebSocket connection and pooling logic, which is handled by the adapter. This is necessary because serverless environments don’t support traditional long-lived database connections. Development/Local:
Uses the standard Prisma Client, which connects directly to your PostgreSQL database. This is simpler and works well for local development, where you have a persistent environment. 3. How the Code Works a. Import and Setup Loads environment variables. Imports the Prisma Client generated code. Declares a prisma variable. b. Production/Serverless Block Why require instead of import? Using require ensures these dependencies are only loaded in production, avoiding errors in local dev where they may not be installed. WebSocket Setup: Neon uses WebSockets for database connections, so you must set the WebSocket constructor. Adapter: The PrismaNeon adapter is used to connect Prisma to Neon’s serverless database. Custom Result Extension: The $extends method is used to ensure that price and rating fields are always returned as strings, which is useful for serialization and frontend compatibility. c. Development/Local Block Uses the standard Prisma Client, which works perfectly for local development. Also uses $extends to ensure consistent data types for price and rating. d. Export Exports the Prisma Client instance for use throughout your app. 4. Why This Structure Is Important Prevents Connection Errors: Using the Neon adapter in local development will cause connection errors (ECONNREFUSED), because the WebSocket endpoint is not available locally. Optimized for Both Environments: Ensures your app works seamlessly both locally and in production/serverless. Consistent Data Types: Always returns price and rating as strings, avoiding issues with serialization or frontend rendering. 5. Common Mistakes to Avoid Using Neon adapter in local/dev: This will always fail unless you have a local Neon-compatible WebSocket server (which you don’t). Forgetting to set NODE_ENV: Make sure your environment is set correctly (development for local, production for serverless/production). Missing DATABASE_URL: Always ensure your .env file has the correct DATABASE_URL for your environment. Summary: This code ensures you use the right database connection method for your environment, preventing common errors and making your app robust for both development and production/serverless deployment
full code :
import 'dotenv/config'; import { PrismaClient } from '@/generated/prisma';
let prisma: PrismaClient;
if (process.env.NODE_ENV === 'production') { // Use Neon adapter only in production/serverless // Use require to avoid issues in local dev // @ts-ignore const ws = require('ws'); // @ts-ignore const { neonConfig, Pool } = require('@neondatabase/serverless'); // @ts-ignore const { PrismaNeon } = require('@prisma/adapter-neon');
neonConfig.webSocketConstructor = ws;
if (!process.env.DATABASE_URL) { throw new Error('DATABASE_URL is not defined in the environment variables'); }
const pool = new Pool({ connectionString: process.env.DATABASE_URL }); const adapter = new PrismaNeon(pool);
prisma = new PrismaClient({ adapter }).$extends({ result: { product: { price: { compute(product) { return product.price.toString(); }, }, rating: { compute(product) { return product.rating.toString(); }, }, }, }, }); } else { // Local/dev: use regular PrismaClient prisma = new PrismaClient().$extends({ result: { product: { price: { compute(product) { return product.price.toString(); }, }, rating: { compute(product) { return product.rating.toString(); }, }, }, }, }); }
export { prisma };
import 'dotenv/config'; import ws from 'ws';
import { PrismaClient } from '@/generated/prisma'; import { neonConfig } from '@neondatabase/serverless'; import { PrismaNeon } from '@prisma/adapter-neon';
let prisma;
if (process.env.NODE_ENV === 'production') { // Neon adapter setup
neonConfig.webSocketConstructor = ws;
if (!process.env.DATABASE_URL) { throw new Error('DATABASE_URL is not defined in the environment variables'); }
const adapter = new PrismaNeon({ connectionString: process.env.DATABASE_URL! });
prisma = new PrismaClient({ adapter }).$extends({ result: { product: { price: { compute(product) { return product.price.toString(); }, }, rating: { compute(product) { return product.rating.toString(); }, }, }, }, }); } else { // Local/dev: use regular PrismaClient prisma = new PrismaClient().$extends({ result: { product: { price: { compute(product) { return product.price.toString(); }, }, rating: { compute(product) { return product.rating.toString(); }, }, }, }, }); }
export { prisma };
Still happening. Only way to fix this is to downgrade to 6.5.0
Authentication error: [Error: No database host or connection string was set, and key parameters have default values (host: localhost, user: test, db: test, password: null). Is an environment variable missing? Alternatively, if you intended to connect with these parameters, please set the host to 'localhost' explicitly.] { clientVersion: '6.9.0' }
solved this due to prisma version issue with latest git commit from main branch
