Migrate & Audit Your Configs
Paste a legacy config and modernize it, or audit your current setup against best practices. Everything runs in your browser — your code never leaves your machine.
Choose a tool
ESLint
Legacy → Flat Config
Convert .eslintrc (JSON / CommonJS) to ESLint v9 flat config and audit deprecated rules.
Migrate ESLint configPrettier
Audit & modernize
Detect deprecated options and review your Prettier config against current recommendations.
Audit Prettier configTSConfig
Compiler options audit
Find deprecated TypeScript compiler options and missing recommended settings.
Audit tsconfig.json