JSON to JSONP API

POST

Wrap any JSON payload in a custom JSONP callback.

JSON to JSONP wraps JSON data in a JavaScript callback function to produce valid JSONP output. Pass an object or JSON string with an optional callback identifier to receive the formatted script string.

Try it — live request, no key required

Request

POSTapi.apiverve.com/v1/jsontojsonp

Body

jsonstring

Verification

Format

No key required to try it. Get a key to use it in your app.

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "callback": "callbackFunction",
    "jsonp": "callbackFunction({\"menu\":{\"id\":\"file\",\"value\":\"File\",\"popup\":false}});"
  }
}

About the JSON to JSONP API

Send a POST request containing a raw JSON object or stringified JSON payload along with an optional callback name. If omitted, the callback defaults to callback. The endpoint validates the JavaScript identifier, including dotted names, and encapsulates the payload into an executable JSONP string, returning both the callback name and the wrapped result.

What people use it for

Cross-Domain Widget Feeds: When third-party embed widgets need cross-domain data without CORS configuration, developers serve JSON payloads wrapped in dynamic client callback functions.
Legacy Portal Maintenance: Engineers supporting legacy enterprise portals convert modern JSON API outputs into JSONP responses so older web clients can parse responses through script tags.
Static Documentation Embeds: Technical writers embed live remote status objects into static HTML documentation sites by wrapping JSON records in custom callback handlers.
Client Mashup Prototyping: To test multi-domain data feeds before updating server headers, frontend developers convert mock JSON datasets into callback-wrapped strings on demand.

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON: Default REST response
XML: Markup format
YAML: Human-readable
CSV: Tabular export
GraphQL: Query language
MCP: For AI agents

View all integrations →

Other ways to use JSON to JSONP

Same data, same APIVerve account, same credit balance — one key works on all of them.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.on VerveKit

Questions.

Common questions about the JSON to JSONP API.

Read the docs →

Can I specify a custom callback function name?

Yes. You can supply any callback identifier in the callback parameter, and the output wraps your JSON data inside that function call.

What structure can the JSON input have?

Any standard JSON structure is supported, including objects, arrays, and nested structures. Pass your payload as a string, and it will be packaged into the JSONP wrapper.

What does the response return?

The response returns the echoed callback function name and the full jsonp string containing your data wrapped inside the callback invocation.

Can I use this to support legacy clients that require JSONP?

Yes. If older browsers or legacy scripts require JSONP callbacks for cross-origin data fetching, this tool packages your existing JSON into the expected format.

What would 25,000 conversions a month cost me?

At 2 credits per call, 25,000 conversions take 50,000 credits. That uses one-quarter of the 200,000 credits on the Starter plan, which supports up to 100,000 conversions at about $0.30 per 1,000 calls. The Free plan includes 100 conversions each month.

Request parameters — POST /v1/jsontojsonp

Sent as JSON in the request body. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Required

Parameter	Type	Example	Description
`json`Required	object	`{"name":"John Doe","age":30,"city":"New York"}`	The JSON data you want converted into JSONP format. Send it as an object or as a JSON-encoded string.

Optional

Parameter	Type	Example	Description
`callback`Optional	string	`callbackFunction`	The callback function name to wrap the JSON data. Must be a JavaScript identifier, optionally dotted (e.g. myCallback or window.myCallback). default callback

Example request

curl -X POST "https://api.apiverve.com/v1/jsontojsonp" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"json":{"menu":{"id":"file","value":"File","popup":false}},"callback":"callbackFunction"}'

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Header	When	Value
`x-api-key`Required	Every request	Your API key. Header names are case-insensitive, so `X-API-Key` is the same header.
`Authorization`Alternate	Instead of the above	`Bearer <key>` — for clients that only expose bearer auth. Resolves to the same account and the same billing.
`content-type`Required	POST body	`application/json`

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Response — POST /v1/jsontojsonp

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "callback": "callbackFunction",
    "jsonp": "callbackFunction({\"menu\":{\"id\":\"file\",\"value\":\"File\",\"popup\":false}});"
  }
}

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.

Field	Type	Example	Description
`callback`	string	`"callbackFunction"`	Echoes back the callback function name provided
`jsonp`	string	`"callbackFunction({"menu":{"id":"file","value":"File","popup":false}});"`	JSON data wrapped in JSONP format with callback function

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Header	What it carries
`x-api-remaining-credits`	Credits left in the current cycle
`x-api-credits-used`	Credits spent in the current cycle
`x-api-max-credits`	The allowance for the cycle
`x-api-version`	Version of the endpoint that answered

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter that has to change.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted here	A key restriction or an IP allow-list — never a bad key.
`429`	Rate limited, or out of credits	Read `error` to tell them apart, then back off or top up.

What a call costs — 2 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Plan	Per month	Credits	JSON to JSONP calls	Per 1,000 calls
Free	Free	200	100	Free
Starter	$29.99	200,000	100,000	$0.30
Pro	$99.99	1,000,000	500,000	$0.20
Mega	$299.99	4,000,000	2,000,000	$0.15

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Compare all pricing tiers →

Call it from cURL — POST /v1/jsontojsonp

No SDK to install — this is a plain HTTPS call to /v1/jsontojsonp with your key in the x-api-key header. Swap in a real key and it runs as-is.

cURL

1
2

curl "https://api.apiverve.com/v1/jsontojsonp" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/jsontojsonp-apiSource, issues and the examples this page is built from.ReferenceJSON to JSONP API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/jsontojsonpnpm APIVerve.API.JSONtoJSONPNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Node.js — POST /v1/jsontojsonp

Install the Node.js SDK, then call the JSON to JSONP API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — npm

npm install @apiverve/jsontojsonp

Node.js

const res = await fetch("https://api.apiverve.com/v1/jsontojsonp", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Resources

npm@apiverve/jsontojsonpThe published Node.js client, versioned and signed.GitHubapiverve/jsontojsonp-apiSource, issues and the examples this page is built from.ReferenceJSON to JSONP API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

APIVerve.API.JSONtoJSONPNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Python — POST /v1/jsontojsonp

No SDK to install — this is a plain HTTPS call to /v1/jsontojsonp with your key in the x-api-key header. Swap in a real key and it runs as-is.

Python

import requests

res = requests.get(
    "https://api.apiverve.com/v1/jsontojsonp",
    headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])

Resources

Also published for

@apiverve/jsontojsonpnpm APIVerve.API.JSONtoJSONPNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from C# / .NET — POST /v1/jsontojsonp

Install the C# / .NET SDK, then call the JSON to JSONP API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — NuGet

dotnet add package APIVerve.API.JSONtoJSONP

C# / .NET

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

var json = await client.GetStringAsync("https://api.apiverve.com/v1/jsontojsonp");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.JSONtoJSONPThe published C# / .NET client, versioned and signed.GitHubapiverve/jsontojsonp-apiSource, issues and the examples this page is built from.ReferenceJSON to JSONP API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/jsontojsonpnpm

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Go — POST /v1/jsontojsonp

No SDK to install — this is a plain HTTPS call to /v1/jsontojsonp with your key in the x-api-key header. Swap in a real key and it runs as-is.

req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/jsontojsonp", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")

res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Resources

Also published for

@apiverve/jsontojsonpnpm APIVerve.API.JSONtoJSONPNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from PHP — POST /v1/jsontojsonp

No SDK to install — this is a plain HTTPS call to /v1/jsontojsonp with your key in the x-api-key header. Swap in a real key and it runs as-is.

PHP

$ch = curl_init("https://api.apiverve.com/v1/jsontojsonp");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);

$response = curl_exec($ch);
echo $response;

Resources

Also published for

@apiverve/jsontojsonpnpm APIVerve.API.JSONtoJSONPNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Ruby — POST /v1/jsontojsonp

No SDK to install — this is a plain HTTPS call to /v1/jsontojsonp with your key in the x-api-key header. Swap in a real key and it runs as-is.

Ruby

require "net/http"

uri = URI("https://api.apiverve.com/v1/jsontojsonp")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.body

Resources

Also published for

@apiverve/jsontojsonpnpm APIVerve.API.JSONtoJSONPNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

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JSON to JSONP API

Try it — live request, no key required

About the JSON to JSONP API

What people use it for

Ways to call it

Other ways to use JSON to JSONP

Questions.

Request parameters — POST /v1/jsontojsonp

Required

Optional

Authentication

Response — POST /v1/jsontojsonp

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — POST /v1/jsontojsonp

Resources

Also published for

Call it from Node.js — POST /v1/jsontojsonp

Resources

Also published for

Call it from Python — POST /v1/jsontojsonp

Resources

Also published for

Call it from C# / .NET — POST /v1/jsontojsonp

Resources

Also published for

Call it from Go — POST /v1/jsontojsonp

Resources

Also published for

Call it from PHP — POST /v1/jsontojsonp

Resources

Also published for

Call it from Ruby — POST /v1/jsontojsonp

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — JSON to JSONP API

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