JSON Flattener

Flatten nested JSON into dot-notation keys, e.g. {a:{b:[1,2]}} becomes {'a.b.0':1,'a.b.1':2}. Choose the delimiter and how arrays are handled.

Pay by wallet (x402) flatten-json

Example

Example answer

{
  "delimiter": ".",
  "flattened": {
    "user.age": 30,
    "user.name": "John",
    "user.address.city": "Stockholm"
  },
  "key_count": 3,
  "array_handling": "index",
  "max_depth_found": 3
}

Inputs

Field	Type	Required	What it is
`data`	any	Yes	Nested JSON object
`delimiter`	string	No	Default '.'
`array_handling`	string	No	'index' or 'stringify'

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`flattened`	object	Always (present in every successful answer)
`key_count`	integer	Always (present in every successful answer)
`max_depth_found`	integer	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "flatten-json",
    "inputs": {
      "data": {
        "user": {
          "age": 30,
          "name": "John",
          "address": {
            "city": "Stockholm"
          }
        }
      }
    },
    "max_price_cents": 2
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "flatten-json",
    "inputs": {
      "data": {
        "user": {
          "age": 30,
          "name": "John",
          "address": {
            "city": "Stockholm"
          }
        }
      }
    },
    "max_price_cents": 2
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "flatten-json",
  inputs: {
    "data": {
      "user": {
        "age": 30,
        "name": "John",
        "address": {
          "city": "Stockholm"
        }
      }
    }
  },
  max_price_cents: 2,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="flatten-json",
    inputs={
        "data": {
            "user": {
                "age": 30,
                "name": "John",
                "address": {
                    "city": "Stockholm",
                },
            },
        },
    },
    max_price_cents=2,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i -X POST https://api.strale.io/x402/v2/flatten-json \
  -H 'Content-Type: application/json' \
  -d '{
    "data": {
      "user": {
        "age": 30,
        "name": "John",
        "address": {
          "city": "Stockholm"
        }
      }
    }
  }'

Limitations

Circular references or nesting over 50 levels can fail
Flattens nested objects using dot notation — circular references or extremely deep nesting (>50 levels) may cause errors
What to do instead: Pre-process input to remove circular references and limit nesting depth before flattening