Safely Read a Nested JSON Path

Medium ⏱ 12 min 48% acceptance ★★★★★ 4.9

API payloads nest deeply: payment.card.last4. Write dig(data, path) where path is a dot-separated string, walking the parsed dict and returning None the moment any level is missing or not a dict — no exceptions raised.

Examples

Example 1

Input

dig({'payment': {'card': {'last4': '4242'}}}, 'payment.card.last4')

Output

'4242'

Explanation

Each segment descends one level.

Example 2

Input

dig({'payment': {}}, 'payment.card.last4')

Output

None

Explanation

The chain breaks quietly at card.

Constraints

No try/except — check types as you walk.
Split the path on '.'.

Topics

JSONnested access

Companies

StripePlaidRazorpay

Hints

Hint 1

isinstance(current, dict) guards each step.

Hint 2

Return None on the first miss.

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