JSON formatter, pretty-print: pretty-print JSON with indentation, optionally with sorted keys

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Format JSON with indentation (2 or 4 spaces, or tabs) and optionally sorted keys. Returns the formatted text. Use to make machine JSON readable or to normalise it for diffs.

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

The JSON text

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
text (required)stringThe JSON text
indentstring2 (default), 4 or tab
sortKeysstringtrue to sort object keys

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/json/format?text=%7B%22b%22%3A2%2C%22a%22%3A1%7D"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/json/format?text=%7B%22b%22%3A2%2C%22a%22%3A1%7D&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "formatted": "{\n  \"a\": 1,\n  \"b\": 2\n}"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is json_format, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

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