Browser name and version, rendering engine, operating system and version, device vendor, model and type such as mobile or tablet, and CPU architecture.

Do I have to send the string?

No. If you omit it, the API parses the User-Agent header of the request itself, which is handy for a quick device check from a browser.

How are new browsers and devices handled?

Parsing uses the ua-parser-js library, whose rules are updated regularly and shipped with each API release.

Is it affected by Chrome's reduced user-agent strings?

Partly. Modern Chrome hides minor version and some platform details in the string by design, so those fields may be coarse. The browser family and major version remain reliable.

What does a call cost?

1 token. The free plan covers 500 parses a month.

ToolsMAINTAINED1 token / call

User Agent Parser API

Browser, engine, OS, device and CPU from any User-Agent string, or from the caller's own

Parse any User-Agent string into structured details — browser, rendering engine, operating system, device (vendor/model/type), and CPU architecture. Pass a string explicitly or let it read the caller's own User-Agent header.

Every call needs an X-Api-Key header. A free key includes 500 tokens a month, no card required. 1 token per call, so the free plan covers about 500 calls a month.

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response.json

{
  "user_agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1",
  "browser": {
    "name": "Mobile Safari",
    "version": "17.0",
    "major": "17"
  },
  "engine": {
    "name": "WebKit",
    "version": "605.1.15"
  },
  "os": {
    "name": "iOS",
    "version": "17.0"
  },
  "device": {
    "vendor": "Apple",
    "model": "iPhone",
    "type": "mobile"
  },
  "cpu": {}
}

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Use cases for User Agent Parser API

Break down traffic by browser, OS and device type in analytics and logs without maintaining regex lists.
Adapt downloads, instructions or layouts to the visitor's platform in a server-rendered app.
Flag requests from outdated browsers or unexpected clients in a support or security dashboard.
Normalise raw user-agent strings in a data pipeline into structured columns.

User Agent Parser API endpoints

Every endpoint with its parameters and a real example response.

GETParse User Agent

GETParse User Agent

https://api-user-agent.dataandapis.com/v1/parse

Query parameters

Parameter	Example
ua	Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1	Optional

Example request

curl "https://api-user-agent.dataandapis.com/v1/parse?ua=Mozilla%2F5.0%20(iPhone%3B%20CPU%20iPhone%20OS%2017_0%20like%20Mac%20OS%20X)%20AppleWebKit%2F605.1.15%20(KHTML%2C%20like%20Gecko)%20Version%2F17.0%20Mobile%2F15E148%20Safari%2F604.1" \
  -H "X-Api-Key: YOUR_API_KEY"

Example response

{
  "user_agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1",
  "browser": {
    "name": "Mobile Safari",
    "version": "17.0",
    "major": "17"
  },
  "engine": {
    "name": "WebKit",
    "version": "605.1.15"
  },
  "os": {
    "name": "iOS",
    "version": "17.0"
  },
  "device": {
    "vendor": "Apple",
    "model": "iPhone",
    "type": "mobile"
  },
  "cpu": {}
}

Where the data comes from

Source: The ua-parser-js rule set (MIT licence). Pure computation, no external call.
Freshness: Computed on every call. Parsing rules are updated with API releases.

One install. Every endpoint.

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import axios from 'axios';

const { data } = await axios.get(
  'https://api-user-agent.dataandapis.com/v1/parse',
  { headers: { 'X-Api-Key': process.env.API_KEY } }
);

User Agent Parser API · X-Api-Key

Explore the endpoints

Browse request parameters and inspect live example responses.

Available Endpoints

Request Parameters

API URL

Headers

X-Api-Key

Query Parameters

ua(Optional)

Target:

Client:

import axios from 'axios';

const url = 'https://api-user-agent.dataandapis.com/v1/parse';
const { data } = await axios.get(url, {
  headers: { 'X-Api-Key': 'YOUR_API_KEY' }
});