JSON Formatter

Format and explore JSON with collapsible sections, or convert Python dictionaries and lists.

Runs locally in your browser. Your input is not uploaded or saved.

Input syntax

Output style

Indentation

JSON input

Formatted JSON

Your formatted JSON will appear here.

Use the arrows to fold objects and arrays. Copy includes every line, even when folded. Use Plain text to select the complete text.

JSON mode uses JavaScript parsing. Very large numbers can lose precision and duplicate object keys keep the last value. Up to 1,000,000 characters.

Also useful

Data Converter

Convert JSON, YAML and CSV locally, with clear options for preserving CSV value types.

Generate types, serializers, validation schemas and Mermaid diagrams from a JSON sample.