Utilities

JSON Formatter

Format, minify, validate, and explore JSON — all locally.

Messy JSON in, readable JSON out. No browser tab, no "paste your API response into this website" — your data stays on your Mac.

Decorative animation of JSON Formatter. Step-by-step instructions follow in the text below.

Format

  1. Open JSON Formatter.
  2. Paste anything JSON-shaped.
  3. It's validated immediately. Valid → pretty-printed with proper indentation. Invalid → a clear error message pointing at the problem, not just "parse error".

The other buttons

  • Minify — strips all whitespace for the smallest possible payload.
  • Sort keys — alphabetizes every object's keys, recursively. Two JSON blobs with the same data but different key order become identical — which makes them diffable in the Diff Tool.
  • Copy — the result, one click.

The tree inspector

Big JSON is easier to explore than to read. The tree view shows the same document as collapsible nodes:

  • Expand and collapse objects and arrays
  • See value types at a glance
  • Drill into deeply nested structures without losing your place

It's the same tree component the JWT Inspector uses for payloads — learn it once, use it twice.

JWT Inspector

Decode any JWT and actually verify its signature — locally.

Diff Tool

Compare two texts — line, word, or character precision, split or unified view.