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JSON Parser, Formatter and Validator

Paste JSON to validate it and format it with clean indentation.

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Paste JSON and format it.

Related guides: How to Clean Up and Format Messy JSON or CSV Data | What Is a JSON File and How Do You Open It?

Parse, verify, and read JSON

Paste a complete JSON value, then format it to verify the syntax and expose nested objects and arrays. Valid JSON can be copied or downloaded after indentation. For a collapsible representation, send the same trusted content to the JSON Viewer.

This page parses JSON data; it does not execute JavaScript, import a database, fetch an API URL, or convert a JavaScript object literal with comments and trailing commas. Open a local JSON file in a trusted text editor first, then paste only content that is safe to process on the current device.

How to Use JSON Formatter and Validator

JSON Formatter and Validator is for real API responses, config snippets, and structured data that need quick readability and syntax checks.

  1. Paste the exact JSON payload, including brackets and quotes, so validation reflects what your code will parse.
  2. Choose indentation that matches your editor, docs, or debugging workflow.
  3. Format the JSON, read the first error if validation fails, and fix the source before trying again.
  4. Trailing commas, mismatched brackets, and unescaped quotes are common reasons JSON fails.
  5. Keep the formatted copy tied to its endpoint, config file, or test case so it is easy to reproduce.

Need a JSON tree view?

For nested API responses, use the JSON Viewer to inspect objects and arrays in a tree before copying formatted output. If you are choosing between the two workflows, read JSON Viewer vs JSON Formatter.

Things to Check

  • Single quotes and trailing commas are invalid json.
  • Very large JSON responses can slow the browser; format smaller samples when working on low-memory devices.
  • Paste the formatted result into your editor, API client, or validator before using it in code.

Helpful FAQ

When is this tool most useful?

Use it when debugging API output, checking config files, reading logs, or preparing JSON examples.

What should I inspect before using the output?

Check syntax, nesting, arrays, escaped characters, sensitive values, and whether the formatted payload still matches the source.

Does this replace a specialist editor?

For huge logs, streaming JSON, schema validation, or production debugging, use developer tooling.

Maintained by Taimour Husnain.

Test JSON.parse input without executing JavaScript

This formatter uses the browser's JSON parser on the pasted data and displays formatted JSON when parsing succeeds. It does not execute the content, accept JavaScript object literals, convert functions, fetch an API, or run Node.js code.

Read What Is a JSON File? for JSON.parse, JSON.stringify, error handling, and JavaScript-versus-JSON examples.