Free Database Connection URL Generator Online | DevTools Hub

Quickly generate and construct accurate database connection strings/URIs for PostgreSQL, MySQL, MongoDB, Redis, MSSQL, and SQLite. Automatically URL-encode passwords and configure custom database options.

🚀 Presets:

⚙️ Connection Parameters

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🔗 Connection URL

Below is the generated database connection string based on your settings.

postgresql://postgres@localhost:5432/mydb
💡 Developer Tip: If your username or password has special characters, always URL-encode them. Leaving the auto-encode checked avoids string interpretation errors.

What is a Database Connection URL?

A database connection string is a parameter-based address string used by software development libraries (like SQLAlchemy, Hibernate, Node-Postgres, Mongoose, or JDBC) to map, authenticate, and connect an application with database systems. The technology ecosystem has standardized on using URI schemes (Uniform Resource Identifiers) to describe these strings.

Our free tool generates accurate connection URLs for PostgreSQL, MySQL, MongoDB, Redis, MSSQL, and SQLite with automatic password encoding and SSL configuration.

GenerateValidateEncodeSecure

Key Features

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    6 Database TypesPostgreSQL, MySQL, MongoDB, Redis, MSSQL, SQLite
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    Auto URL EncodingHandles special characters in passwords automatically
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    SSL/TLS SupportConfigure secure connections with one click
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    Cloud PresetsQuick templates for Supabase, Atlas, Upstash

How to Use the Generator

Create your connection URL in four simple steps

01
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Select Database

Choose from PostgreSQL, MySQL, MongoDB, Redis, MSSQL, or SQLite.

02
✏️

Enter Details

Fill in host, port, username, password, and database name.

03
⚙️

Configure Options

Enable SSL, URL encoding, and add custom query parameters.

04
📋

Copy URL

Click to copy the generated connection string to your clipboard.

Supported Databases

Connection URL formats for popular database systems

🐘

PostgreSQL

Port: 5432
postgresql://user:pass@host:5432/db
ACID compliantAdvanced SQLJSON support
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MySQL

Port: 3306
mysql://user:pass@host:3306/db
Fast readsReplicationWide adoption
🍃

MongoDB

Port: 27017
mongodb+srv://user:pass@host/db
NoSQLFlexible schemaHorizontal scaling
❤️

Redis

Port: 6379
redis://:pass@host:6379/0
In-memoryCachingPub/Sub
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MSSQL

Port: 1433
sqlserver://host:1433;database=db
EnterpriseWindows integrationT-SQL
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SQLite

Port: N/A
sqlite:database.db
ServerlessFile-basedZero config

Understanding Database Connection URLs and URIs

The Anatomy of a Standard Connection String

Most modern databases follow the uniform RFC 3986 URI specification. The general template is structured as follows:

protocol://[username]:[password]@[host]:[port]/[database_name]?[query_parameters]

Let\'s break down each element of this URI template:

  • Protocol / Scheme: Defines the database engine and driver being targeted (e.g. postgresql://, mysql://, mongodb://).
  • Authentication Credentials: The username and optional password. These are separated from each other by a colon (:) and separated from the server address by an at symbol (@).
  • Server Hostname & Port: The network IP address or domain host where the database server is running, followed by the port standard (e.g., 5432 for PostgreSQL).
  • Database Name: The targeted database name or catalog where the tables reside.
  • Query Parameters: Dynamic configuration arguments used to establish specific driver rules such as connection pools, timeout thresholds, SSL modes (e.g. sslmode=require), or write concern details.

The Special Characters Gotcha: Why Password URL-Encoding is Mandatory

One of the most common configuration errors backend engineers face is connection failure due to passwords containing special characters. Because characters like @, :, /, +, or ? are used as structural delimiters inside standard URI routing, placing them raw into a password causes the parser to fail.

For instance, if your database username is admin and your password is MyP@ssword, a raw connection string would look like: postgresql://admin:MyP@ssword@localhost:5432/mydb. In this scenario, the database driver will read the password as MyP and assume the hostname is ssword@localhost, throwing a host-resolution error. To solve this, special characters must be URL-encoded (RFC 3986 Percent Encoding). The @ character must be converted to %40, resulting in a safe and correct password: MyP%40ssword.

Comparing Connection URL Standards

Different database engines and cloud platforms require specific connection URL formats. Here is a matrix of standard connection types:

Database EngineFormat SchemeDefault PortExample Connection URI
PostgreSQLpostgresql://5432postgresql://user:pass@host:5432/db?sslmode=require
MySQLmysql://3306mysql://user:pass@host:3306/db?ssl=true
MongoDB SRVmongodb+srv://Dynamicmongodb+srv://user:pass@host/db?retryWrites=true
Redisredis:// or rediss://6379redis://:pass@host:6379/0
SQLitesqlite:Serverlesssqlite:relative/path/to/database.db

Security Guidelines for Connection Strings

  • Never Hardcode Secrets: Avoid embedding raw connection strings in your application code repository. Always store your connection URLs in safe environment variables (e.g., using a .env file) that are omitted from version control using .gitignore.
  • Enforce Transport Encryption (SSL/TLS): When connecting to production databases across networks, always enable SSL settings (e.g. sslmode=require for Postgres, or rediss:// for Redis) to prevent eavesdropping and man-in-the-middle attacks.
  • Practice Least Privilege: Configure specific database users for your applications with minimum necessary privileges, rather than connecting using the global database root or superuser accounts.

✅ Connection Best Practices

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    Use Environment VariablesStore connection URLs in .env files, never in code
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    Enable SSL/TLSAlways use encrypted connections for production databases
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    URL-Encode PasswordsEncode special characters to prevent parsing errors
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    Least Privilege AccessCreate app-specific users with minimal permissions
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    Connection PoolingUse connection pools to manage database connections efficiently
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    Timeout ConfigurationSet appropriate connection and query timeouts

⚠️ Common Mistakes

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    Hardcoding credentials→ Use environment variables and secret managers
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    Not encoding passwords→ Always URL-encode special characters
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    Using root/admin accounts→ Create dedicated app users with limited permissions
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    Skipping SSL in production→ Enable SSL/TLS for all network connections
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    Exposing connection strings→ Add .env to .gitignore, never commit secrets
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    Wrong port numbers→ Verify default ports: PG=5432, MySQL=3306, Mongo=27017

Real-World Use Cases

How developers use database connection URLs

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Web Application Backend

Connect your Node.js, Python, or PHP backend to PostgreSQL or MySQL databases using environment variables.

DATABASE_URL=postgresql://app_user:pass@db.example.com:5432/production
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Microservices Architecture

Each microservice connects to its own database instance using service discovery and connection pooling.

REDIS_URL=redis://:token@cache-service:6379/0
☁️

Cloud-Native Applications

Deploy to Vercel, Netlify, or AWS with managed databases like Supabase, PlanetScale, or MongoDB Atlas.

mongodb+srv://user:pass@cluster0.mongodb.net/prod?retryWrites=true
💻

Local Development

Run databases locally with Docker Compose and connect using localhost connection strings.

mysql://root:password@localhost:3306/dev_db

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📚 Related Tutorials & Resources

Master database connections, security, and best practices with these comprehensive guides.

🔌

Database Connection Guide

Complete guide to database connection strings, URL encoding, and security.

Read More →
🗄️

Database Design Patterns

Learn database design, normalization, indexing, and optimization strategies.

Read More →
🐳

Docker & Databases

Run databases in Docker containers for local development and testing.

Read More →
View All Tutorials→

❓ Frequently Asked Questions

A Database Connection URL (also known as a connection string or URI) is a standardized string of characters used by application software to establish a connection with a database server. It typically specifies the protocol/driver (e.g., postgresql), authentication credentials (username and password), server host address, port number, database name, and optional configuration options.
Database URLs use reserved characters like "@", "/", ":", and "+" to separate different parts of the URI. If your password contains these characters (for example, "Pass@word123"), a connection client will misinterpret the "@" symbol as the separator between credentials and host. To prevent this, special characters in passwords must be URL-encoded (e.g., "@" becomes "%40"). Our generator does this automatically for you.
The standard mongodb:// protocol specifies an exact list of mongod hosts in the connection string (useful for standard replica sets). The newer mongodb+srv:// protocol utilizes DNS SRV records to dynamically discover replication servers, allowing replica sets to change hosts without modifying the client configuration. SRV also defaults to TLS/SSL enabled.
Yes, because our Database URL Generator operates 100% locally on your browser. No data, hostnames, usernames, or passwords are sent to any external server. You can verify this by checking your browser's network inspector or running the tool completely offline.
Adding sslmode=require in your PostgreSQL connection string instructs the client driver to establish a secure, encrypted SSL/TLS connection with the server. If the server does not support SSL connections, the connection attempt will fail. This is crucial for cloud databases like Supabase or AWS RDS.
Unlike PostgreSQL or MySQL, SQLite is a serverless, file-based database. Therefore, SQLite connection strings do not require a host, port, username, or password. Instead, they simply specify the path to the database file on the local disk (e.g., sqlite:database.db or sqlite:/var/data/app.sqlite).