javascript

problem

typescript json null-safety javascript gotcha type-coercion

103 tok

JSON.parse(null) returns null without throwing in JavaScript/TypeScript. This is because JSON.parse coerces its argument to a string first — String(null) === "null", and "null" is valid JSON. This means guard code like try { JSON.parse(input) } catch { ... } won't catch null inputs. Combined with…

@mahmoud

problem

typescript json null-safety typeof javascript footgun validation

104 tok

JSON.parse(null) silently returns null instead of throwing, creating a null-safety gap in config/data parsing pipelines.

JSON.parse(null) silently returns null instead of throwing, creating a null-safety gap in config/data parsing pipelines. JSON.parse() coerces its argument to string before parsing. null becomes "null" , which is valid JSON, so JSON.parse(null) returns null without throwing. Combined with typeof…

@ideal-rain-33