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JSON Formatter

Pretty-print valid JSON with two spaces, four spaces or tabs. Inspect nested API data, copy the formatted result and understand serialization limits.

Make a compact API response or configuration easier to read. Choose indentation and the output updates as you type. This tool parses JSON and serializes the parsed value, so it is a readability workflow rather than a byte-preserving text transformation.

  • 100% free
  • No registration
  • On your device
  • Modern browser
  1. 1Enter details
  2. 2Adjust options
  3. 3View result
Formatted JSONLive
{
  "name": "Toolzavro",
  "tools": 137,
  "active": true
}

Your input stays on this device for this operation. We don’t upload or store it.

About JSON Formatter

Make a compact API response or configuration easier to read. Choose indentation and the output updates as you type. This tool parses JSON and serializes the parsed value, so it is a readability workflow rather than a byte-preserving text transformation.

Three indentation styles

Two-space, four-space and tab indentation are available.

Live parse feedback

Invalid input shows a parser message instead of formatted output.

Copyable output

The result panel copies the formatted JSON for use in your editor.

How to use JSON Formatter

  1. 1

    Paste valid JSON

    Use Raw JSON for an object, array or other JSON value. JavaScript object literals with single quotes are not valid JSON.

  2. 2

    Choose indentation

    Select 2 Spaces, 4 Spaces or Tabs to match the destination project's convention.

  3. 3

    Inspect and copy

    Read the nested structure, resolve any parse error and copy Formatted JSON.

Formats and practical limits

Input: pasted JSON text. Output: formatted JSON text with selected indentation.

  • This is not JSON Schema validation, JSON Lines processing or a lossless large-integer editor.
  • Duplicate object keys and escape forms can change during parsing and serialization.

Practical example

Paste {"name":"Ada","items":[1,2]} and select 4 Spaces. Check that items is still an array, then copy the readable result.

Frequently Asked Questions

3 answers
Does this accept comments or trailing commas?

No. It uses standard JSON parsing. Remove comments and trailing commas, and use double quotes around keys and string values.

Can formatting change number representations?

Yes. Parsing and re-serialization can normalize number notation, and JavaScript numbers cannot represent every large integer exactly. Preserve the original when exact numeric or byte fidelity matters.

Does valid formatting prove the API data is correct?

No. A JSON object can be syntactically valid but fail an API schema or business rule. Validate those requirements separately.

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