Prettifies JSON and API response data with configurable indentation, sorting, and syntax validation — fixes malformed JSON and makes nested structures readable.
Prettifies JSON and API response data with configurable indentation, sorting, and syntax validation — fixes malformed JSON and makes nested structures readable.
Format JSON Lines (JSONL) data — pretty-print each line as formatted JSON for readability and debugging.
Format, validate, and convert JSON to Zod schemas, URL query parameters, flat key-value pairs, JSON-LD, or analyze size and structure.
Generate and inspect invisible Unicode characters — zero-width space (ZWSP), zero-width non-joiner (ZWNJ), zero-width joiner (ZWJ), left-to-right/right-to-left marks, and word joiner. Copy raw bytes or visualizable forms.
Convert messy CSV or Excel sheets from clients into clean JSON in one batch. Handles missing values, nested rows, and generates strict JSON schemas for 50+ files at once. Everything runs locally in your browser — nothing is uploaded.
JSON Formatter lets you prettifies JSON and API response data with configurable indentation, sorting, and syntax validation — fixes malformed JSON and makes nested structures readable.. It works on any device with a modern web browser.
Prettifies JSON and API response data with configurable indentation, sorting, and syntax validation — fixes malformed JSON and makes nested structures readable. It runs entirely in your browser — no software installation or data uploads required.
Paste or type your content directly into the provided text area.
Yes. After the initial page load, JSON Formatter runs entirely on your device with no internet connection needed. All processing is done locally.
It pretty-prints minified JSON with proper indentation, sorts keys alphabetically (optional), and collapses or expands nested brackets. Malformed JSON gets flagged with the exact line number of the syntax error.
Yes. Select from 2 spaces (default), 4 spaces, tabs, or minified output. The indent setting applies instantly as you switch between options.
Yes. If your JSON has syntax errors — missing commas, trailing braces, unquoted keys — the tool highlights the exact location and describes the error so you can fix it quickly.
Yes. Toggle key sorting to arrange all object keys alphabetically. This is useful for comparing two JSON structures or making large configs easier to navigate.
No. All formatting and validation happens locally in your browser using the JSONLint library. Your data never leaves your device.
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