NestJS, TypeScript, and TypeORM Error: Error During Migration Run

If you’re working with NestJS, TypeScript, and TypeORM, you may encounter an error during migration run that can be frustrating to debug. In this blog post, we’ll explore the possible causes of this error and provide multiple solutions to help you resolve it.

Possible Causes

There are several reasons why you might encounter an error during migration run in NestJS, TypeScript, and TypeORM. Let’s take a look at some common causes:

1. Incorrect database configuration
2. Missing or outdated migration files
3. Incompatible TypeScript and TypeORM versions
4. Database connection issues

Solution 1: Check Database Configuration

The first step in resolving this error is to ensure that your database configuration is correct. Make sure that the connection details in your ormconfig.json file or your database.module.ts file are accurate and match your database setup.

{
  "type": "mysql",
  "host": "localhost",
  "port": 3306,
  "username": "your_username",
  "password": "your_password",
  "database": "your_database",
  "entities": ["dist/**/*.entity{.ts,.js}"],
  "migrations": ["dist/migrations/*{.ts,.js}"],
  "cli": {
    "migrationsDir": "src/migrations"
  }
}
  

Solution 2: Check Migration Files

If your migration files are missing or outdated, it can cause errors during migration run. Make sure that all the necessary migration files are present in the specified migrations directory and are up to date.

To generate a new migration file, you can use the following command:

npx typeorm migration:generate -n YourMigrationName

Once you have the migration file, you can run the migration using the following command:

npx typeorm migration:run

Solution 3: Check TypeScript and TypeORM Versions

Make sure that you are using compatible versions of TypeScript and TypeORM. Incompatible versions can lead to errors during migration run. Check the documentation of both TypeScript and TypeORM to ensure that you are using the recommended versions.

Solution 4: Database Connection Issues

If none of the above solutions work, you may be facing database connection issues. Double-check your database server, credentials, and network connection to ensure that everything is working properly.

Conclusion

Error during migration run in NestJS, TypeScript, and TypeORM can be caused by various factors such as incorrect database configuration, missing or outdated migration files, incompatible TypeScript and TypeORM versions, or database connection issues. By following the solutions provided in this blog post, you should be able to resolve the error and continue with your development process smoothly.