DS Express Errors (centralizing errors library) — v1.9.0 Release Notes July 23, 2026

#dsexpresserrors #express #errors #opensource

v1.9.0 – July 23, 2026

This release focuses on improving Prisma and Sequelize support, making error detection more reliable while providing clearer development logs.

What's new?

Added strict instanceof checks for Prisma and Sequelize
Configuration property errorClasses now supports Prisma and Sequelize
Fixed ESM import issue
Fixed PrismaClientInitializationError detection
Improved SequelizeConnectionError detection. It now distinguishes between:
- SequelizeConnectionRefusedError
- SequelizeHostNotFoundError
- SequelizeHostNotReachableError
- SequelizeAccessDeniedError

New development log format

Development logs for Prisma and Sequelize have been improved and now include more useful information.

Library Name (Prisma code if available): [Error Name] followed by the formatted message.

Example:

Prisma P2002: [PrismaClientKnownRequestError] Unique constraint failed: { modelName: User }; { target: email }

Sequelize: [SequelizeAccessDeniedError] Access denied for user...

What does it mean?

Starting with v1.9.0, you can enable advanced Prisma and Sequelize detection by providing the corresponding objects in the errorClasses configuration.

Simply import the original object from the library and pass it to setConfig():

const { Prisma } = require('@prisma/client');
const { Sequelize } = require('sequelize');

setConfig({
    errorClasses: {
        Prisma,
        Sequelize
    }
});