JSON Visualiser

Free JSON visualizer tool - validate, format and convert JSON to CSV. Instant response for developers with no limits.

Swap input and output

Convert JSON array of objects to CSV. Each object becomes a row.

Convert CSV (with headers) to JSON array of objects.

JSON input

Output

About this tool

JSON (JavaScript Object Notation) is the most widely used data exchange format in web applications and REST API. JSON Visualizer provides instant validation, formatting, and minification of JSON data directly in the browser without installing tools or sending data to a server. The tool pinpoints syntax errors with exact line and character positions. Formatting improves readability of minified JSON, while minification reduces size for network transfer. The tool also supports two-way JSON ↔ CSV conversion, which is useful for exporting data to Excel or Google Sheets and back again. Ideal for developers working with REST API, configuration files, database exports, or test data.

How to use

1Paste JSON into the input field or upload a file with the Upload file button.
2Click Validate to check the syntax - if there is an error, the exact line and character position will be shown.
3Click Format for an indented readable output or Minify for a compact result.
4To convert to CSV, click Convert to CSV - the JSON must be an array of objects with the same keys.
5Copy the result with the Copy button or use Swap to move the output back into the input.

Specifications and limits

JSON validation with exact error location (line number and character position). Formatting with 2-space indentation. Minification removes all unnecessary spaces and line breaks. Conversion of a JSON array of objects to CSV (separator: semicolon). Conversion of CSV with a header row back to JSON. Automatic detection of the CSV separator (semicolon or comma). All processing happens in the browser - no data is sent to a server.