Can Prettier check for code errors?

No. Prettier does not check for code errors. Its job is formatting only. It does not analyze logic, does not look for bugs, and does not check whether the code works correctly. Prettier only cares about appearance.

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#What it does

• adds or removes ;
• picks quotes ' or "
• formats indentation
• wraps lines
• brings the code to a consistent style

Prettier = outward beauty and consistency.

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#What it does NOT do

• does not find bugs
• does not see incorrect conditions, loops, or comparisons
• does not check variables
• does not catch runtime errors
• does not warn that the code might crash

Prettier is not a linter. It cannot analyze logic.

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#Who checks for errors

For that you need ESLint (or TypeScript, for type errors). ESLint:

• finds dangerous constructs
• checks for potential errors
• points out incorrect practices

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#Summary

Prettier is cosmetics, ESLint is diagnostics.