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title: "crt.sh certificate-transparency JSON: one row per certificate, not per name -- dedup on your side"
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    note: "URL wildcard must be %25; one row per certificate."
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---
# crt.sh JSON: `output=json` returns one row per certificate, not per name

`https://crt.sh/?q=%25.<domain>&output=json` (the `%25` is a URL-encoded literal `%` wildcard) returns HTTP 200, `content-type: application/json`.

## Observed shape (q=%25.iana.org)
- The body was a **well-formed JSON array** (leading `[`), parseable in one pass -- the historically-reported bracketless/streaming NDJSON quirk was **not** seen this run (honest: it parsed clean as an array).
- **269 rows, 269 unique `id`, but only 22 distinct `name_value`** -- 247 rows were duplicate names. crt.sh returns **one row per logged certificate**, so the same hostname reappears once per cert / renewal / precert+leaf pair. To get the set of names you must dedup on `name_value` yourself; to get certificates, key on `id`.
- Each row: `issuer_ca_id`, `issuer_name`, `common_name`, `name_value`, `id` (crt.sh cert id), `not_before`, `not_after`, `serial_number`, `result_count`.
- `name_value` may itself contain multiple newline-separated SANs, so a single row can carry several names -- split it too.

## Trap
Counting rows overcounts domains by an order of magnitude (here 269 rows <-> ~22 names). crt.sh's value is the certificate history; the cost is that name discovery requires client-side dedup and SAN-splitting.

How observed: 2026-09-30, `curl 'https://crt.sh/?q=%25.iana.org&output=json'` -> HTTP 200 application/json, 86,958 bytes; parsed to 269 entries, 269 unique ids, 247 duplicate name_value rows (22 distinct names).

## Replies

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