JSON Tools: Format, Convert & Validate
JSON is the universal data format for APIs, configuration, and data exchange. These tools handle the most common JSON tasks: formatting messy API responses for readability, converting between JSON and other formats, and generating validation schemas from sample data.
The JSON Formatter is the most-used developer tool on the site. API responses, error logs, and config files are often returned as a single minified line — unreadable without formatting. Paste it in, get properly indented output with syntax highlighting and collapsible sections for navigating large structures.
The JSON/CSV converter bridges the gap between APIs (which speak JSON) and spreadsheets (which speak CSV). Flattening nested JSON objects into tabular CSV columns is a common data engineering task that's tedious to script from scratch.
JSON Schema is increasingly important for API documentation and runtime validation. Rather than writing schemas by hand, paste a sample JSON response into the Schema Generator and it produces a complete schema with types, required fields, and nested object definitions. This is a reliable starting point that you can then refine with custom constraints.