JSON Formatter

Format, minify, validate, and copy JSON with live validation feedback.

JSON Formatter

Paste JSON, watch live validation, format or minify the payload, and copy the result in one click.

Live validation

Format and minify output is always derived from the live input.

Output and status

Tip: the error message includes line and position details.

Valid JSON
Valid JSON
Type: object
Lines
1
Characters
161
Bytes
161
{
  "tool": "calcworks",
  "type": "json-formatter",
  "features": [
    "parse",
    "format",
    "minify",
    "validate",
    "copy"
  ],
  "settings": {
    "indent": 2,
    "preserveOrder": false
  },
  "active": true
}

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What is a JSON formatter used for?

This tool is useful for API payloads, configuration files, and any structured data that needs to be more readable.

When the input is invalid, the error location and validation status are shown immediately.

When should I use minify?

Minify mode is useful when you want to trim payload size, remove extra whitespace, and keep transport text compact.

The formatted view is better for debugging, code review, and inspecting nested data.

How should I read the result?

When the JSON is valid, the tool shows the JSON type, line count, character count, and byte size.

When parsing fails, the parser message and approximate line/column location are emphasized.

Why JSON syntax is strict

JSON requires double-quoted keys, disallows trailing commas, and is built from numbers, strings, booleans, null, arrays, and objects.

Those rules align with the data interchange format described by RFC 8259 and the MDN JSON reference.

Debugging and review workflow

Formatted output makes nested objects and arrays easier to scan during debugging or code review.

Parser errors come from the runtime; line and position hints can be approximate, especially with large payloads.

Safer handling note

The tool runs in the browser, but real customer data, tokens, secrets, or personal information should be masked before sharing examples.

Valid JSON does not mean the data is correct for a business rule, API schema, or security policy.