CSV to JSON API: spreadsheet exports to a JSON array

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

Convert CSV (comma, semicolon, tab or pipe; delimiter detected automatically; quoted fields supported) to a JSON array of objects using the first row as keys. Numbers stay as text unless numbers=true. Use to load spreadsheet exports into an agent.

When to use it

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

Try it with your own inputs

The CSV text, first row is the header

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

Inputs

NameTypeDescription
text (required)stringThe CSV text, first row is the header
numbersstringtrue to turn numeric cells into numbers

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/csv/to-json?text=name%2Cage%0AAda%2C36"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/csv/to-json?text=name%2Cage%0AAda%2C36&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

{
  "rows": [
    {
      "name": "Ada",
      "age": 36
    }
  ],
  "count": 1,
  "columns": [
    "name",
    "age"
  ]
}

From an AI agent (MCP)

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

https://tools.funwords.eu/mcp

Questions

Do I have to name the delimiter?

No, it is detected automatically; the first row becomes the keys.

Are numbers converted?

They stay as text unless numbers=true.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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