Transform JSON Array Items API

Apply a transformation to each item in a JSON array using a field mapping spec: pick fields, rename fields, add computed fields (string templates, math expressions on other fields), and drop fields. Available as a simple REST API — POST your input, get structured JSON back. 1 credit per call, no rate limiting, works in any language with HTTP support.

How it works

POST a JSON object with your input data to /v1/exec-map-json. The API processes your request server-side using real computation (not mocked data) and returns a structured JSON response with your results and metadata including credits used and processing time.

Use cases

• Use Transform JSON Array Items in automated pipelines without installing a library
• Call Transform JSON Array Items from AI agent workflows via MCP or REST
• Integrate Transform JSON Array Items into serverless functions with zero dependencies
• Build Transform JSON Array Items functionality into any language that supports HTTP

API Reference

POST https://slopshop.gg/v1/exec-map-json
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Input parameters

Example response

{
  "data": {
    "result": 42,
    "console": [],
    "execution_ms": 3
  },
  "meta": {
    "credits_used": 1,
    "engine": "real",
    "ms": 4
  }
}

Examples

Three real-world scenarios showing how developers use Transform JSON Array Items in production.

curl -X POST https://slopshop.gg/v1/exec-map-json \
  -H "Authorization: Bearer $SLOPSHOP_KEY" \
  -H "Content-Type: application/json" \
  -d '{"code": "return 2 + 2;"}'

curl -X POST https://slopshop.gg/v1/exec-map-json \
  -H "Authorization: Bearer $SLOPSHOP_KEY" \
  -H "Content-Type: application/json" \
  -d '{"code": "const data = [1, 2, 3, 4, 5]; return data.map(x => x * x);"}'

curl -X POST https://slopshop.gg/v1/exec-map-json \
  -H "Authorization: Bearer $SLOPSHOP_KEY" \
  -H "Content-Type: application/json" \
  -d '{"code": "const s = 'hello world'; return s.split(' ').map(w => w[0].toUpperCase() + w.slice(1)).join(' ');"}'

Code examples

curl

curl -X POST https://slopshop.gg/v1/exec-map-json \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input": "your data here"}'

Python

import requests

response = requests.post(
    "https://slopshop.gg/v1/exec-map-json",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={"input": "your data here"}
)
result = response.json()
print(result["data"])

Node.js

const response = await fetch("https://slopshop.gg/v1/exec-map-json", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({ input: "your data here" })
});
const { data } = await response.json();
console.log(data);

CLI

# Install the Slopshop CLI
npm install -g slopshop

# Set your API key
export SLOPSHOP_KEY=your_api_key

# Call exec-map-json
slop exec-map-json '{"input": "your data here"}'

Pricing

Credits are purchased in bundles starting at $1 for 1,000 credits. All compute APIs like this one use 1 credit per call — that's $0.001. See all pricing tiers.

Related APIs in Execute

• Run JavaScript in Sandbox API — Execute a JavaScript code string in an isolated Node.js vm sandbox with no access to the filesystem, network, or process. Returns the return value, console output, execution time, and any thrown errors. Timeout enforced.
• Evaluate Math Expression API — Evaluate a complex mathematical expression string including variables, functions (sin, cos, log, sqrt, factorial), and constants (pi, e). Supports unit awareness and returns both numeric result and step-by-step breakdown.
• Run jq Query on JSON API — Apply a jq-compatible filter expression to a JSON input and return the result. Supports field selection, array indexing, pipes, map, select, and common jq functions. No shell execution — pure JS implementation.
• Regex Match All Groups API — Apply a regular expression to a text string and return every match with all capture group values, match positions (start/end indices), and match count. Supports named capture groups. Returns structured results.
• JSONPath Query API — Run a JSONPath expression (e.g. $.store.book[*].author) against a JSON object and return all matching values. Like XPath for JSON. Supports recursive descent, wildcards, filters, and array slices.

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