tryParseJson

Problem

You need to preserve JSON syntax failure before validating parsed application data.

Solution

import { tryParseJson } from '@vielzeug/arsenal/object';
import { s } from '@vielzeug/spell';

const User = s.object({ id: s.number(), name: s.string() });
const parsed = tryParseJson(raw);

if (!parsed.ok) throw parsed.error;

const user = User.parse(parsed.value);

Pitfalls

• Successful values are unknown, not claimed generic types.
• Use a schema validator for application data.
• Use JSON.parse directly when syntax failures should throw immediately.