Pretty-prints JSON Lines data — formats each line as indented JSON for debugging, log analysis, and streaming data inspection.
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.
Decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly.
Prettifies JSON and API response data with configurable indentation, sorting, and syntax validation — fixes malformed JSON and makes nested structures readable.
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.
Bidirectional YAML to JSON and JSON to YAML conversion with auto-format detection and real-time preview. Perfect for configuration files, API payloads, and data migration.
JSONL Formatter lets you pretty-prints JSON Lines data — formats each line as indented JSON for debugging, log analysis, and streaming data inspection.. It works on any device with a modern web browser.
Pretty-prints JSON Lines data — formats each line as indented JSON for debugging, log analysis, and streaming data inspection. 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, JSONL Formatter runs entirely on your device with no internet connection needed. All processing is done locally.
Format JSON Lines (JSONL) data — pretty-print each line as formatted JSON for readability and debugging. All processing runs locally — no code is sent to any server.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check the tool description for specifics.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. Formatters use well-known libraries (sql-formatter, Prettier-compatible patterns) and follow widely adopted rules.
NDJSON to JSON Array
Convert Newline Delimited JSON into a standard JSON array format. Everything runs locally in your browser — nothing is uploaded.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.