Json Validate API

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

Validate a JSON string. Returns type + shape summary, or a parse error with position.

Needs an API key. Running a tool needs an API key. Keys are not for sale yet: ask for early access. About API keys

Try it

Request body

application/json

json

string required

JSON string to validate.

Example arguments

Verified

{
  "json": {
    "ok": true
  }
}

Email Validate Validate an email address and report every rule it breaks and break it into local / domain / TLD parts.
Html Formatter Format (beautify) or minify HTML and return the result with a tag-balance validation report.
Openapi Validator Validate an OpenAPI 3.x (or Swagger 2.0) document given as JSON or YAML and return a report with errors, warnings, and summary info (title…
Phone Format Validate a phone number and format it as E.164 (+CCNNN…), international and national, using libphonenumber metadata for every country.
State Machine Designer Validate a finite state machine given as nodes and edges and return a normalized machine config plus issues.
Url Validate Validate that a string is a well-formed URL and (optionally) require HTTPS.

curl -X POST https://api.findutils.com/api/tools/json-validate/execute \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "json": "{\"ok\":true}"
  }'

const response = await fetch('https://api.findutils.com/api/tools/json-validate/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json', Authorization: 'Bearer YOUR_API_KEY' },
  body: JSON.stringify({"json":"{\"ok\":true}"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/json-validate/execute",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={"json":"{\"ok\":True}"},
)
data = response.json()

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

Also an MCP tool

Call json_validate 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: API key
REST id: json-validate
MCP name: json_validate
Category: Validation
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

More Validation tools

More to explore