JSON Tools
Format & Validate
These tools cover the most common day-to-day JSON tasks: making JSON readable, checking it for errors, repairing common mistakes, and exploring structure visually.
All Format & Validate Tools
JSON Formatter
Pretty-print JSON with custom indentation.
JSON Beautifier
Clean up messy JSON into a readable layout.
JSON Validator
Check JSON syntax and get precise error locations.
JSON Minifier
Strip whitespace to shrink JSON payloads.
JSON Viewer / Tree
Explore JSON as a collapsible tree.
JSON Editor
Edit JSON with a live tree preview.
JSON Repair
Fix common JSON mistakes automatically.
JSONL Formatter
Pretty-print each line of a JSONL file.
JSONL Validator
Validate every line of a JSONL file independently.
Frequently Asked Questions
What is the difference between formatting and validating JSON?
Formatting (or beautifying) adds indentation and whitespace to make JSON readable. Validating checks whether the JSON is syntactically correct according to the spec. You can format valid JSON, but you cannot format invalid JSON without fixing errors first.
What is JSONL and how does it differ from JSON?
JSONL (JSON Lines) is a format where each line is a separate, complete JSON value. It is useful for streaming data, log files, and datasets too large to hold as a single JSON array. Our JSONL formatter and validator handle each line independently.
How does JSON Repair work?
JSON Repair detects and fixes common mistakes such as trailing commas, single-quoted strings, missing quotes around keys, and unescaped control characters. It is not a full parser but covers the most frequent real-world issues.
What is a JSON Tree Viewer?
A JSON Tree Viewer renders JSON as a collapsible tree of nodes, making it easy to navigate deeply nested objects without manually counting brackets. You can expand and collapse individual branches to explore the structure.