JSON to CSV Converter

Overview

The converter scans every object in `json` and collects the union of their keys in order of first appearance. That list becomes `columns`, so the column order follows the first object that introduced each key. Each object is then written as one row in that column order; a key that is missing, `null` or `undefined` produces an empty cell. Rows are joined with `\n` line endings.

Values are converted with JavaScript string conversion. Numbers and booleans come out as written, an array becomes its items joined by commas, and a nested object becomes the literal text `[object Object]`, so flatten nested structures before sending them. A value is wrapped in double quotes when it contains the `delimiter`, a double quote, a newline or a carriage return, and embedded quotes are doubled, following the usual CSV convention.

`delimiter` defaults to a comma. `include_header` defaults to true; set it to false to get data rows only, while `columns` and `column_count` are still returned. `row_count` is the number of objects in the array. The request must carry a `Content-Length` header and the body may not exceed 512,000 bytes; larger bodies get a 413. An empty array is rejected as a missing parameter.

Live Test JSON to CSV Converter API →

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

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curl -X POST https://api.apiverve.com/v1/jsontocsv \
  -H "x-api-key: your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
  "json": [
    {
      "name": "John Doe",
      "age": 30,
      "city": "New York"
    },
    {
      "name": "Jane Smith",
      "age": 25,
      "city": "Los Angeles"
    }
  ],
  "delimiter": ",",
  "include_header": true
}'

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const res = await fetch('https://api.apiverve.com/v1/jsontocsv', {
  method: 'POST',
  headers: {
    'x-api-key': 'your_api_key_here',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "json": [
    {
      "name": "John Doe",
      "age": 30,
      "city": "New York"
    },
    {
      "name": "Jane Smith",
      "age": 25,
      "city": "Los Angeles"
    }
  ],
  "delimiter": ",",
  "include_header": true
}),
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

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import requests

res = requests.post(
    "https://api.apiverve.com/v1/jsontocsv",
    headers={"x-api-key": "your_api_key_here"},
    json={
    "json": [
        {
            "name": "John Doe",
            "age": 30,
            "city": "New York"
        },
        {
            "name": "Jane Smith",
            "age": 25,
            "city": "Los Angeles"
        }
    ],
    "delimiter": ",",
    "include_header": True
},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

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package main

import (
	"fmt"
	"io"
	"net/http"
	"strings"
)

func main() {
	body := strings.NewReader(`{
  "json": [
    {
      "name": "John Doe",
      "age": 30,
      "city": "New York"
    },
    {
      "name": "Jane Smith",
      "age": 25,
      "city": "Los Angeles"
    }
  ],
  "delimiter": ",",
  "include_header": true
}`)
	req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/jsontocsv", body)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

Parameters

Sent as JSON in the request body. Premium parameters are accepted on every plan but only take effect on plans that include them.

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

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{
  "status": "ok",
  "error": null,
  "data": {
    "row_count": 2,
    "column_count": 3,
    "columns": [
      "name",
      "age",
      "city"
    ],
    "csv": "name,age,city\nJohn Doe,30,New York\nJane Smith,25,Los Angeles"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Use cases

Data Export

Convert API JSON responses to CSV format for importing into Excel, Google Sheets, or databases

Report Generation

Transform JSON data into CSV reports for business intelligence tools and data analysis

Legacy System Integration

Convert modern JSON APIs to CSV format for compatibility with legacy systems

Data Backup

Export JSON datasets to CSV format for archival and backup purposes

Other ways to use JSON to CSV Converter

Set up JSON to CSV Converter on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Related

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