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JSON formatter

Turn a wall of JSON into something you can read. Validate, format, and copy.

JSON input

Indentation

Valid JSON

Formatted JSON

{
  "hello": "world",
  "items": [
    1,
    2,
    3
  ]
}

Use this tool in your workflow

Protected JSON API; disabled by default. An approved account and bearer API key are required. Invalid input returns HTTP 400. POST requests accept application/json.

POST /api/tools/json
{"text":"{\"hello\":1}","indent":2}

View parameters and examples →

What it does

Turn a wall of JSON into something you can read. Validate, format, and copy.

How to use it

Paste up to 1 million characters. Validation runs as you type. Choose 2 or 4 spaces, or minify the output for a compact file.
JSON requires double-quoted keys and strings. Comments and trailing commas are not valid JSON. Your text stays in your browser.
Uses JavaScript JSON parsing: duplicate keys keep the last value and numbers beyond JavaScript precision can be rounded. Store exact large identifiers as strings.

Example

Input {"hello":1} and choose two spaces to display an indented object, or choose minified for compact output.

Methodology

JSON.parse validates the input and JSON.stringify produces the output.

Limitations

Up to 1 million characters. Duplicate keys retain the last value; large numbers may lose precision.

Automation

A protected JSON API is documented for this tool. Execution requires deployment enablement and an approved account’s API key.

View capabilities and documentation

Reference updated 2026-09-14

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