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json-safety

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Use when reviewing scripts, client components, bundles, or runtime behavior related to Parse JSON safely with error handling. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.

skills/json-safety/SKILL.md

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# Parse JSON safely with error handling

JSON.parse() on invalid input throws a SyntaxError that will crash your application if uncaught. API responses, localStorage values, and user-provided data can all be malformed. Safe parsing with validation catches these errors at the point of parsing, not deep in your application logic when a missing property causes an unexpected error.

## Quick Reference

- JSON.parse() throws a SyntaxError on invalid input — always use try/catch
- Validate the shape of parsed data before accessing its properties
- JSON.stringify() can return undefined for values that can't be serialized
- Use a type-safe parser (Zod, Valibot) for data from external sources

## Check

Find all JSON.parse() calls in this file and check whether each one is wrapped in try/catch and whether the result is validated before use.
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