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JSON Formatter — Pretty-Print & Beautify JSON Online

Format, validate, and tidy JSON with custom indentation, optional sorted keys, log extraction, and live preview. Runs in your browser on Onlikit — free developer utility.

Pretty-print JSON fast

Paste API responses, config files, or minified payloads and get readable indentation. Adjust tab width, sort object keys for stable diffs, or pull JSON out of noisy log lines—all without uploading your data elsewhere.

### What developers use here for

  • Readable structure — choose 2-space, 4-space, or tab indentation, or toggle a one-line compact view for copy-pasting into URLs or headers
  • Stable ordering — sort keys recursively before formatting so teammates see predictable diffs in reviews
  • Messy clipboard — when logs wrap JSON with extra text, try Extract JSON to isolate the first balanced `{ … }` or `[ … ]` block
  • Flow — optional live formatting (debounced), keyboard shortcut Ctrl+Enter (or Cmd+Enter) to format from the cursor, drag-and-drop or file picker for `.json`, sample payload for a quick sanity check

All parsing and formatting run in your browser; treat sensitive payloads as you would any local-only editor practice.