Json Unflatten API

POST https://api.findutils.com/api/tools/json-unflatten/execute

Unflatten a flat key map back into nested JSON. Understands both array notations json_flatten emits: items[0].name and items.0.name. A numeric segment rebuilds an array rather than an object.

Try it

Request body

application/json

json

string required

Flat JSON object to expand.
separator

string optional

Key separator. Defaults to ".". Default ".".
arrayNotation

string optional

Which notation the flat keys use, matching json_flatten. In "dot", a bare numeric segment such as items.0 rebuilds an array; in "bracket" only items[0] does, so an object key that is literally "0" survives. One of bracket · dot. Default "bracket".

Example arguments

Verified

{
  "json": {
    "a.b": 1
  }
}

curl -X POST https://api.findutils.com/api/tools/json-unflatten/execute \
  -H "Content-Type: application/json" \
  -d '{
    "json": "{\"a.b\":1}"
  }'

const response = await fetch('https://api.findutils.com/api/tools/json-unflatten/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"json":"{\"a.b\":1}"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/json-unflatten/execute",
    json={"json":"{\"a.b\":1}"},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/json-unflatten/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"json":"{\"a.b\":1}"}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call json_unflatten from Claude, Cursor or any MCP client. Same arguments, same output.

https://mcp.findutils.com

MCP reference

Rate limit: 60 a minute, per IP
Auth: None
REST id: json-unflatten
MCP name: json_unflatten
Category: Data
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

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