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Data & APIs

JSON Formatter & Converter

JSON is the language of modern APIs. This guide explains the syntax and links to free online tools that format, validate and convert JSON in your browser.

Format and validate

Unreadable JSON is hard to debug. A formatter pretty-prints it with consistent indentation and points directly at syntax errors such as trailing commas or missing quotes.

Convert to other formats

Turn JSON into CSV for spreadsheets, generate TypeScript interfaces for type-safe frontends, and convert between JSON and YAML for configuration files.

A quick syntax reminder

JSON uses double-quoted keys and strings, commas between items and no trailing commas. Values can be strings, numbers, objects, arrays, booleans or null.

JSON tools

  • JSON formatter and validator.
  • JSON minifier for production payloads.
  • JSON to CSV and CSV to JSON.
  • JSON to TypeScript interface generator.
  • YAML and JSON converters.

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Frequently asked questions

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based format for storing and exchanging structured data, widely used by APIs and configuration files.

Why is my JSON invalid?

Common causes are trailing commas, single quotes instead of double quotes, unquoted keys and missing brackets. A validator will pinpoint the exact line.

Can I convert JSON to CSV?

Yes, the JSON to CSV tool flattens a JSON array of objects into spreadsheet-friendly rows.

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