Amazon Keyword Suggestions — Autocomplete Keyword Research

Pull Amazon's own search autocomplete suggestions for any seed keyword, expanded a–z, across 18 marketplaces. These are the phrases Amazon shows shoppers — what people actually type — which is what you want for listing optimisation and PPC research. HTTP-only, no account, no API key.

Input

Field	Type	Default	Description
keywords	array	required	Seed terms to expand
marketplace	enum	US	Which Amazon site — 18 supported
department	string	aps	Search alias: aps (all), electronics, kitchen, books…
expansion	enum	alphabet	none, alphabet (a–z), alphanumeric (a–z, 0–9)
maxKeywordsPerSeed	integer	500	Stop a seed at this many unique keywords
maxConcurrency	integer	5	Parallel requests

Why the a–z expansion matters

A plain autocomplete call returns about 10 suggestions. Asking for the seed plus each letter — laptop stand a, laptop stand b, … — turns that into a real keyword set:

Seed	Probes	Unique keywords
laptop stand	27	243
yoga mat	27	251

Keywords are deduplicated across probes (laptop b and laptop ba both surface laptop bag), and each row keeps the prefix that produced it so you can see which probe found what.

Output

{
  "_input": "laptop stand",
  "_source": "S1-completion-api",
  "_scrapedAt": "2026-09-07T06:23:20Z",

  "seed": "laptop stand",
  "prefix": "laptop stand b",       // the exact probe sent
  "keyword": "laptop stand bamboo",
  "rank": 2,                        // position within that probe's answer
  "marketplace": "US",
  "department": "aps",
  "suggestionType": "KeywordSuggestion",
  "strategyId": "organic",
  "candidateSources": "local",
  "isGhost": false,
  "refTag": "nb_sb_ss_i_1_6"
}

494 rows across two seeds in testing, zero duplicates, every field populated.

How it works

completion.amazon.<tld>/api/2017/suggestions is the endpoint behind the search box.

Each marketplace has its own host — and the wrong one fails silently

This is the trap worth knowing. completion.amazon.com with a non-US marketplace id returns HTTP 200 with an empty suggestions array. Not an error, not a redirect — just nothing. An actor that hardcodes the .com host and swaps only the marketplace id therefore ships UK, DE and JP options that quietly return no keywords, and nothing in the response says so.

Every host/id pair here was verified by asking for "laptop" and checking the answers came back in the right language:

Market	Returns
DE	laptop ständer, laptoptasche, laptop 17 zoll
TR	laptop çantası
MX	laptop gamer
PL	laptop 17 cali

17 of 18 marketplaces answered on the first attempt. India returned HTTP 502 during testing — it is included, but may fail.

Known limits

Limit	Detail
No search volume	Amazon does not expose volume or competition here — these are suggestions, ranked, nothing more
~10 per probe	The expansion is what produces breadth; there is no page parameter
Suggestions are personalised-ish	Ranking varies slightly by region and over time; run scheduled if you want a trend
India	502 at the time of writing