ForHosting KIT · Documents & PDF

Validate PDF form fields and required values

Validate the data intended for a PDF form before a document-filling step begins. Supply the form field definitions and a values object, and this capability checks required fields, exact value types, real calendar dates, allowed choices, duplicate definitions, and unexpected keys.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

It returns a clean set of validated values when everything matches. Because validation is deterministic and does not open or alter a PDF, it is useful both as a browser-side preflight and as a predictable API guard in document automation.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/pdf/fill-form-fields

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/pdf/fill-form-fields \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"fields":[{"name":"full_name","type":"text","required":true},{"name":"age","type":"integer","required":false}],"values":{"full_name":"Ada Lovelace","age":36}}'

const res = await fetch("https://api.kit.forhosting.com/pdf/fill-form-fields", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "fields": [
      {
        "name": "full_name",
        "type": "text",
        "required": true
      },
      {
        "name": "age",
        "type": "integer",
        "required": false
      }
    ],
    "values": {
      "full_name": "Ada Lovelace",
      "age": 36
    }
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/pdf/fill-form-fields",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "fields": [
        {
            "name": "full_name",
            "type": "text",
            "required": true
        },
        {
            "name": "age",
            "type": "integer",
            "required": false
        }
    ],
    "values": {
        "full_name": "Ada Lovelace",
        "age": 36
    }
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/pdf/fill-form-fields", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"fields":[{"name":"full_name","type":"text","required":true},{"name":"age","type":"integer","required":false}],"values":{"full_name":"Ada Lovelace","age":36}}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"fields":[{"name":"full_name","type":"text","required":true},{"name":"age","type":"integer","required":false}],"values":{"full_name":"Ada Lovelace","age":36}}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/pdf/fill-form-fields", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "fields": [
    {
      "name": "full_name",
      "type": "text",
      "required": true
    },
    {
      "name": "age",
      "type": "integer",
      "required": false
    }
  ],
  "values": {
    "full_name": "Ada Lovelace",
    "age": 36
  }
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "pdf.fill_form_fields",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Limits

`max_mb`	25
`max_pages`	200

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →