JSON Formatter — Pretty-Print & Beautify JSON Online
Paste API responses, config snippets, or minified payloads and get readable indentation in seconds. Adjust tab width, sort object keys for stable diffs, or pull JSON out of noisy log lines—all in your browser.
Working with tokens or signatures next? Pair this with the JWT Toolkit. For pattern checks on strings, open the Regex Tester. See the full Onlikit tools list for PDF and mail utilities too.
What developers use this 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, use Extract JSON to isolate the first balanced
{ … }or[ … ]block - Fast iteration — optional live formatting (debounced), Ctrl+Enter (or Cmd+Enter) to format from the cursor, drag-and-drop or file picker for
.json, and a sample payload for a quick sanity check
How processing works
All parsing and formatting run locally in your browser. Nothing is sent to Onlikit servers by design—treat that as one layer of safety, not a substitute for your own policies on secrets and PII.
When it falls short
Invalid JSON (trailing commas, single quotes, truncated responses) will fail parse until you fix the source. Extremely large payloads can still slow the tab; trim or split when possible.
Related: need structured tokens instead of raw JSON? See JWT Toolkit — decode and verify in the browser.