Does it call your own server?

No — validation happens in the browser using a hand-curated field map (lib/openrtb-schema.ts).

Does it handle extensions?

The ext object is surfaced in the field table, but contents are opaque by design (exchange-specific).

OpenRTB Inspector

Paste a BidRequest or BidResponse. The tool auto-detects the kind, validates required fields, flags deprecated ones (e.g., video.placement, regs.us_privacy), and annotates every known path with a one-line description from the OpenRTB spec.

Runs locally in your browser

OpenRTB JSON

{
  "id": "80ce30c53c16e6ede735f123ef6e32361bfc7b22",
  "at": 1,
  "cur": ["USD"],
  "imp": [
    {
      "id": "1",
      "banner": {
        "format": [{ "w": 300, "h": 250 }, { "w": 300, "h": 600 }],
        "pos": 1,
        "api": [5, 7]
      },
      "video": {
        "mimes": ["video/mp4"],
        "minduration": 5,
        "maxduration": 30,
        "protocols": [2, 3, 5, 6, 7, 8],
        "w": 640,
        "h": 480,
        "plcmt": 1,
        "linearity": 1,
        "startdelay": 0,
        "skip": 1
      },
      "bidfloor": 0.50,
      "bidfloorcur": "USD",
      "secure": 1,
      "ext": { "gpid": "/1111/home#top" }
    }
  ],
  "site": {
    "id": "102855",
    "name": "fizzkit.dev",
    "domain": "fizzkit.dev",
    "page": "https://fizzkit.dev/",
    "cat": ["IAB19-6"],
    "publisher": { "id": "8953", "name": "Megatam", "domain": "megatam.net" }
  },
  "device": {
    "sua": { "browsers": [{ "brand": "Chromium", "version": ["125", "0"] }], "platform": { "brand": "macOS", "version": ["14","4"] } },
    "ip": "192.0.2.1",
    "devicetype": 2,
    "os": "macOS",
    "osv": "14.4",
    "language": "en"
  },
  "user": { "id": "55816b39711f9b5acf3b90e313ed29e51665623f" },
  "source": { "tid": "b8a4f4e0-4c36-44b0-a2d0-123456789abc" },
  "regs": {
    "gdpr": 1,
    "gpp": "DBABMA~CPXxRfAPXxRfAAfKABENB-CgAAAAAAAAAAYgAAAAAAAA",
    "gpp_sid": [2]
  },
  "tmax": 120
}

1,399 chars · 55 lines

Impressions: 1
Formats: banner, video
Context: site
Page: https://fizzkit.dev/
Currency: USD
Auction type: 1 (first price)
tmax: 120ms

Kind

request

Errors

Warnings

Info

Impressions

Auction type

tmax

120ms

VAST Inspector

Parse IAB VAST 2/3/4 XML tags and inspect creatives, tracking pixels, and wrappers.

IAB TCF Consent Decoder

Decode IAB TCF v2.2 consent strings — CMP, vendors, purposes, restrictions.

IAB GPP Decoder

Decode Global Privacy Platform strings — US National, state-specific, TCF EU.

ads.txt / app-ads.txt Validator

Parse ads.txt and app-ads.txt files; detect duplicates, syntax errors, DIRECT vs RESELLER counts.

About OpenRTB Inspector

OpenRTB Inspector is part of FizzKit — a collection of focused, browser-based tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.

Frequently asked questions

OpenRTB 2.6. 2.5 requests will validate too — 2.6-only fields (plcmt, regs.gdpr, regs.gpp, device.sua) are explained where present.

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