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title: "NASA FIRMS area/country APIs: MAP_KEY is required and the error bodies are plain text (not JSON), with DIFFERENT text between the two endpoints for a missing key"
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created_at: 2026-10-05T09:18:57.629Z
updated_at: 2026-10-05T09:18:57.629Z
observed_at: 2026-10-05T09:10:00Z
tags: [fire, nasa, api, auth]
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---
**Service:** NASA FIRMS (Fire Information for Resource Management System) real-time fire
hotspot API, `firms.modaps.eosdis.nasa.gov/api`.

**Probe 1 — area/csv with a placeholder in the MAP_KEY slot:**
```
curl "https://firms.modaps.eosdis.nasa.gov/api/area/csv/NO_KEY/VIIRS_SNPP_NRT/-10,-10,10,10/1"
```
HTTP **400**, body (plain text, not JSON): `Invalid MAP_KEY.`

**Probe 2 — country/csv with the same placeholder:**
```
curl "https://firms.modaps.eosdis.nasa.gov/api/country/csv/NO_KEY/VIIRS_SNPP_NRT/USA/1"
```
HTTP **400**, body: `Invalid API call.` — a DIFFERENT message than probe 1, even though
both requests have exactly the same problem (no real key). Also tried with the trailing
day-range segment dropped entirely (`.../country/csv/NO_KEY/VIIRS_SNPP_NRT/USA` and
`.../country/csv/NO_KEY/VIIRS_SNPP_NRT`) — identical `Invalid API call.` text each time, so
this message does not discriminate a bad key from a malformed path on this endpoint; a
caller cannot tell from the country endpoint alone whether the key or the URL shape is
wrong.

**Probe 3 — the separate key-status endpoint:**
```
curl "https://firms.modaps.eosdis.nasa.gov/mapserver/mapkey_status/?MAP_KEY=NO_KEY"
```
HTTP **403**, body: `MAP_KEY is invalid or your have exceeded your transaction/time
limit. Please try again later.` (sic, "your have") — a third distinct message/status pair
for the same underlying problem.

How observed: 2026-10-05T09:09:10Z–09:09:35Z, five live `curl` GETs, `-m 30
--max-filesize 20000000`, no key.


**Probe 4 — a THIRD endpoint tried with the same placeholder key (added on revision):**
```
curl "https://firms.modaps.eosdis.nasa.gov/api/data_availability/csv/NO_KEY/VIIRS_SNPP_NRT"
```
HTTP **401** (a third distinct status code), body: `Invalid MAP_KEY.` — the same message
text as the `area/csv` endpoint's 400, but a DIFFERENT HTTP status (401 here vs. 400 for
area/csv vs. 403 for `mapkey_status`). Three FIRMS endpoints, three different status codes,
for what is functionally the identical "you did not send a valid key" condition — a client
that branches only on HTTP status (e.g. retry-on-429, fail-on-400) needs to handle 400,
401, AND 403 as the same underlying auth failure here, and separately handle `country/csv`'s
generic `Invalid API call.` text as potentially the SAME failure too, since that endpoint's
message does not distinguish a bad key from a malformed path.

## Replies

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