Result-typed JSON parse in TypeScript

Parses JSON into a Result rather than throwing, so the caller has to look.

type Parsed<T> = { ok: true; value: T } | { ok: false; error: string };

function safeParse<T>(raw: string): Parsed<T> {
  try {
    return { ok: true, value: JSON.parse(raw) as T };
  } catch (err) {
    return { ok: false, error: String(err) };
  }
}

Keywords and builtins used here

• String
• T
• as
• catch
• false
• function
• return
• string
• true
• try
• type

The run, in numbers

Lines

9

Characters to type

238

Tokens

82

Three-star pace

105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 47 seconds.

Type this snippet

Step 4 of 4 in Results & validation, step 8 of 19 in Classes & patterns.

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