Explain Error

What Is This?

Overview

Better Auth is a modern authentication library for JavaScript and TypeScript applications. When integrating it into a project, developers frequently encounter cryptic error messages that can slow down debugging and delay feature delivery. The Better Auth Error Explanation skill translates these raw error outputs into clear, actionable descriptions that help developers understand what went wrong and how to fix it.

This skill analyzes error messages thrown by the Better Auth library, identifies the root cause, and provides structured guidance on resolving the issue. Instead of spending time searching through documentation or community forums, developers receive an immediate explanation with context-specific recommendations. The skill covers configuration errors, authentication flow failures, session management issues, and plugin-related problems.

By integrating this skill into a development workflow, teams can reduce the time spent on debugging authentication logic and focus more on building application features. The explanations are written in plain language, making them accessible to developers at various experience levels.

Who Should Use This

• Frontend developers integrating Better Auth into React, Vue, or Svelte applications
• Backend developers configuring Better Auth with Node.js, Bun, or edge runtimes
• Full-stack engineers managing authentication flows across client and server boundaries
• Technical leads reviewing authentication-related pull requests and error logs
• QA engineers writing tests for authentication scenarios and interpreting test failures
• Junior developers who are new to authentication libraries and need guided error resolution

Why Use It?

Problems It Solves

• Raw Better Auth error messages often lack context, making it difficult to identify whether the issue is a configuration problem, a missing environment variable, or a runtime conflict.
• Developers waste significant time cross-referencing error codes with documentation, especially when working under deadline pressure.
• Authentication errors that occur in production can be difficult to reproduce locally, and without clear explanations, root cause analysis takes longer than necessary.
• Teams with mixed experience levels struggle to maintain consistent debugging practices when error messages are ambiguous or undocumented.
• Plugin and adapter errors in Better Auth can be especially opaque, requiring deep knowledge of the library internals to interpret correctly.

Core Highlights

• Translates Better Auth error codes and stack traces into plain-language explanations
• Provides step-by-step resolution guidance for each identified error type
• Covers errors from core authentication flows, session handling, and plugin integrations
• Supports TypeScript and JavaScript project contexts
• Identifies common misconfigurations in environment variables and adapter settings
• Highlights related configuration fields that may need adjustment
• Works with errors from both client-side and server-side Better Auth instances
• Reduces average debugging time for authentication issues

How to Use It?

Basic Usage

Paste the error message or stack trace directly into the skill input. For example, if your application throws the following error:

BetterAuthError: Invalid secret. Please set a valid secret in your auth configuration.
    at validateConfig (/node_modules/better-auth/dist/index.js:142:11)

The skill will explain that the secret field in your Better Auth configuration is missing or improperly set, and will recommend adding a strong secret value to your environment variables and referencing it in your configuration:

import { betterAuth } from "better-auth";

export const auth = betterAuth({
  secret: process.env.BETTER_AUTH_SECRET,
  database: { provider: "sqlite", url: "./db.sqlite" },
});

Specific Scenarios

Session expiration errors: When a session token expires and the client receives an authentication error, the skill identifies whether the issue is a misconfigured session duration, a missing refresh token handler, or a clock skew problem between client and server.

Database adapter failures: If Better Auth cannot connect to the configured database, the skill distinguishes between connection string errors, unsupported adapter versions, and missing schema migrations.

Real-World Examples

A developer deploying to a serverless environment receives an error about unsupported database connections. The skill identifies that the SQLite adapter is incompatible with serverless runtimes and recommends switching to a compatible adapter such as Turso or a hosted PostgreSQL provider.

A team member encounters an OAuth callback error during social login setup. The skill explains that the redirect URI registered in the OAuth provider dashboard does not match the callback URL configured in Better Auth.

Important Notes

Requirements

• A valid Better Auth error message or stack trace is required as input
• The skill works best with Better Auth version 1.0 and later
• TypeScript projects should include relevant type error output when applicable