search_doffin

Search Norwegian public procurement notices on Doffin.

Signature: search_doffin(query: string, optional, default ''; types: list of string (comma-separated), optional, default None; statuses: list of string (comma-separated), optional, default None; contract_nature: list of string (comma-separated), optional, default None; cpv_codes: list of string (comma-separated), optional, default None; locations: list of string (comma-separated), optional, default None; buyer: list of string (comma-separated), optional, default None; winner: list of string (comma-separated), optional, default None; date_from: string, optional, default None; date_to: string, optional, default None; sort_by: string, optional, default 'RELEVANCE'; page: integer, optional, default 1; hits_per_page: integer, optional, default 10; include_placeholders: yes/no, optional, default False; limit: integer, items, optional, default 25; offset: integer, items, optional, default 0)

Direct GET

For navigating agents: open the HTML page with parameters in the URL. The result is fetched and displayed without screenshots or form filling.

Open this validated HTML GET URL

https://allemannsdata.com/wiki/kilder/doffin/search_doffin/?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0

Replace {query}, {types}, {statuses}, {contract_nature}, {cpv_codes}, {locations}, {buyer}, {winner}, {date_from}, {date_to}, {sort_by}, {page}, {hits_per_page}, {include_placeholders} with values. Remove unused optional parameters from the URL.

For software and dashboards: Read the operation descriptor. The JSON GET template is https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0. Open this exact request as JSON.

ParameterRequirementJSON typeDescription
queryoptionalstringFree-text search (Norwegian or English), e.g. "IT-drift", "snørydding", "rammeavtale konsulent". Start here.
typesoptionalunionFilter by notice type. Parent types: PLANNING, COMPETITION, RESULT. Specific types: ANNOUNCEMENT_OF_COMPETITION, DYNAMIC_PURCHASING_SCHEME, QUALIFICATION_SCHEME, ANNOUNCEMENT_OF_INTENT, PRE_ANNOUNCEMENT, ADVISORY_NOTICE, NOTICE_ON_BUYER_PROFILE, ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT, CHANGE_OF_CONCLUSION_OF_CONTRACT, CANCELLED_OR_MISSING_CONCLUSION_OF_CONTRACT. Use ["COMPETITION"] + statuses=["ACTIVE"] for open tenders.
statusesoptionalunionACTIVE (open for bids), EXPIRED, AWARDED, CANCELLED.
contract_natureoptionalunionWORKS, SERVICES and/or SUPPLIES.
cpv_codesoptionalunion8-digit CPV codes, e.g. ["45000000"]. Matches the code and its children. Find codes with search_cpv_codes(). Best combined with a free-text query.
locationsoptionalunionNUTS-style location ids, e.g. ["NO060"] (Trøndelag), or "anyw" for non-location-bound. See list_location_codes().
buyeroptionalunionBuyer organization full name(s) exactly as written on notices, e.g. ["Trondheim kommune"]. Resolved to Doffin's internal buyer id via a free-text lookup; names that match no buyer are reported in "note" and, if none match, no results are returned (rather than an unfiltered search). Pass the 32-hex buyer id from a result's buyer field directly to skip the lookup.
winneroptionalunionDoffin's internal supplier id (32-hex). Winner names cannot be used - they are not present in search results to resolve against.
date_fromoptionalunionPublication date lower bound, "YYYY-MM-DD".
date_tooptionalunionPublication date upper bound, "YYYY-MM-DD".
sort_byoptionalstringRELEVANCE (default), PUBLICATION_DATE_DESC, PUBLICATION_DATE_ASC, DEADLINE, ESTIMATED_VALUE_ASC, ESTIMATED_VALUE_DESC.
pageoptionalinteger1-based page number.
hits_per_pageoptionalinteger1-50 (default 10).
include_placeholdersoptionalbooleanBy default, hits whose buyer fields look like unfilled eForm template values (org id 123456789, placeholder buyer names) are dropped from the results as junk. Set True to keep them, each flagged with "possible_placeholder": true.
limitoptionalintegerGateway page size; default 25, maximum 100.
offsetoptionalintegerNumber of list items to skip; default 0.
Generated JavaScript, Python and response structure

Use JSON when the user requests code, machine-readable data, value extraction or further computation. Use the HTML GET page to identify the correct source and verify parameters.

Example for generated JavaScript and Python

https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0

Replace URL placeholders and remove unused optional parameters.

JavaScript in a dashboard

const url = "https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0";
const response = await fetch(url);
if (!response.ok) {
  const failure = await response.json();
  throw new Error(`${failure.error.code}: ${failure.error.message} ${failure.suggestion}`);
}
const result = await response.json();
const data = result.data;

Python without additional packages

import json
from urllib.request import urlopen

url = "https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0"
with urlopen(url) as response:
    result = json.load(response)
data = result["data"]

Response structure

{
  "source": "doffin",
  "operation": "search_doffin",
  "parameters": {},
  "data": {},
  "entities": [],
  "_meta": {"retrieved_at": "...", "sources": [], "cache": {}},
  "_links": {"self": "...", "source": "...", "wiki": "...", "feedback": "..."}
}
Form for manual use

The form is a fallback for people and browser agents that cannot open the GET URL directly.

Type: string. Free-text search (Norwegian or English), e.g. "IT-drift", "snørydding", "rammeavtale konsulent". Start here.
Type: list of string (comma-separated). Filter by notice type. Parent types: PLANNING, COMPETITION, RESULT. Specific types: ANNOUNCEMENT_OF_COMPETITION, DYNAMIC_PURCHASING_SCHEME, QUALIFICATION_SCHEME, ANNOUNCEMENT_OF_INTENT, PRE_ANNOUNCEMENT, ADVISORY_NOTICE, NOTICE_ON_BUYER_PROFILE, ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT, CHANGE_OF_CONCLUSION_OF_CONTRACT, CANCELLED_OR_MISSING_CONCLUSION_OF_CONTRACT. Use ["COMPETITION"] + statuses=["ACTIVE"] for open tenders.
Type: list of string (comma-separated). ACTIVE (open for bids), EXPIRED, AWARDED, CANCELLED.
Type: list of string (comma-separated). WORKS, SERVICES and/or SUPPLIES.
Type: list of string (comma-separated). 8-digit CPV codes, e.g. ["45000000"]. Matches the code and its children. Find codes with search_cpv_codes(). Best combined with a free-text query.
Type: list of string (comma-separated). NUTS-style location ids, e.g. ["NO060"] (Trøndelag), or "anyw" for non-location-bound. See list_location_codes().
Type: list of string (comma-separated). Buyer organization full name(s) exactly as written on notices, e.g. ["Trondheim kommune"]. Resolved to Doffin's internal buyer id via a free-text lookup; names that match no buyer are reported in "note" and, if none match, no results are returned (rather than an unfiltered search). Pass the 32-hex buyer id from a result's buyer field directly to skip the lookup.
Type: list of string (comma-separated). Doffin's internal supplier id (32-hex). Winner names cannot be used - they are not present in search results to resolve against.
Type: string. Publication date lower bound, "YYYY-MM-DD".
Type: string. Publication date upper bound, "YYYY-MM-DD".
Type: string. RELEVANCE (default), PUBLICATION_DATE_DESC, PUBLICATION_DATE_ASC, DEADLINE, ESTIMATED_VALUE_ASC, ESTIMATED_VALUE_DESC.
Type: integer. 1-based page number.
Type: integer. 1-50 (default 10).
Type: yes/no. By default, hits whose buyer fields look like unfilled eForm template values (org id 123456789, placeholder buyer names) are dropped from the results as junk. Set True to keep them, each flagged with "possible_placeholder": true.

Result

Source: Doffin and TED. Retrieved 2026-10-02T17:13:17Z in 1.876 seconds.

total_count:
7
hits:

7 results

  1. id:
    2023-692324
    buyer:

    1 results

    1. id:
      9480dffdd5dbab17ee98e4ac6633d754
      organization_id:
      963 946 902
      name:
      Kragerø kommune
    heading:
    Nødvannstanker
    description:
    Kragerø kommune skal anskaffe nødvannstanker. Disse skal være på krokløftramme. Tilbyder kan også beskrive aktuelle opsjoner (tilleggsutstyr) i Bilag 4a Prisskjema. Se øvrig om informasjon i Bilag 1 Kravspesifikasjon. Leveringstid: Snarest mulig etter inngått kontrakt.
    location_id:

    3 results

    1. NO094
    2. NO093
    3. NO091
    estimatedValue:
    currencyCode:
    NOK
    amount:
    2000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2023-05-04T10:00:00Z
    deadline:
    2023-05-26T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2023-05-04
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  2. id:
    2026-105716
    buyer:

    2 results

    1. id:
      1bff3bfe0313adec54df6f4a6bbe712b
      organization_id:
      964 965 781
      name:
      OFA IKS
    2. id:
      590855bb1d294b565aeaa6c9ff994df7
      organization_id:
      964965781
      name:
      Tvedestrand kommune
    heading:
    Nødvannstank
    description:
    Tvedestrand kommune skal anskaffe nødvannstank på cirka 10 000 liter, med integrert pumpesystem og nødstrøm. Tanken skal være på krokløftramme.
    location_id:

    1 results

    1. NO092
    estimatedValue:
    currencyCode:
    NOK
    amount:
    1300000.0
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    2 results

    1. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    2. RESULT
    status:
    not reported by source
    issueDate:
    2026-03-23T13:38:48Z
    deadline:
    2026-02-13T00:00:00Z
    sentToTed:
    yes
    publicationDate:
    2026-03-25
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

  3. id:
    2026-102204
    buyer:

    2 results

    1. id:
      1bff3bfe0313adec54df6f4a6bbe712b
      organization_id:
      964 965 781
      name:
      OFA IKS
    2. id:
      590855bb1d294b565aeaa6c9ff994df7
      organization_id:
      964965781
      name:
      Tvedestrand kommune
    heading:
    Nødvannstank
    description:
    Tvedestrand kommune skal anskaffe nødvannstank på cirka 10 000 liter, med integrert pumpesystem og nødstrøm. Tanken skal være på krokløftramme.
    location_id:

    1 results

    1. NO092
    estimatedValue:
    currencyCode:
    NOK
    amount:
    1300000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    AWARDED
    issueDate:
    2026-01-28T22:31:11Z
    deadline:
    2026-02-13T22:59:00Z
    sentToTed:
    yes
    publicationDate:
    2026-01-30
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

  4. id:
    2021-374361
    buyer:

    1 results

    1. id:
      286d35cc0eae1c7a8e97e72a98f2b28a
      organization_id:
      972 417 971
      name:
      Harstad kommune
    heading:
    Anskaffelse av nødvannstank
    description:
    Tank med krokløft til nødvannsforsyning. Tank på henger.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2021-01-05T10:00:00Z
    deadline:
    2021-01-29T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2021-01-05
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  5. id:
    2020-311002
    buyer:

    1 results

    1. id:
      b3db51b4620ae8fe99ad34c43fdb69c0
      organization_id:
      988 783 196
      name:
      Vadsø Vann og Avløp KF
    heading:
    Innkjøp av nødvannstank
    description:
    Innkjøp av nødvannstank som kan fraktes rundt på forskjellige plasser for levering av Nødvann.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2020-05-19T10:00:00Z
    deadline:
    2020-06-08T10:00:00Z
    sentToTed:
    yes
    publicationDate:
    2020-05-19
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  6. id:
    2026-107251
    buyer:

    1 results

    1. id:
      3b72c6f21b59b3b79d655c2ded9b09e1
      organization_id:
      940100925
      name:
      Ringerike Kommune
    heading:
    Kjøp, tilpasning og levering av to (2) beredskapstanker/nødvannstanker for lagring av drikkevann til Ringerike kommune
    description:
    Oppdragsgiver har behov for to (2) beredskapstanker for lagring av drikkevann.
    location_id:

    1 results

    1. NO085
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    AWARDED
    issueDate:
    2026-04-21T10:43:00Z
    deadline:
    2026-05-26T10:00:00Z
    sentToTed:
    yes
    publicationDate:
    2026-04-22
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

  7. id:
    2026-113103
    buyer:

    1 results

    1. id:
      3b72c6f21b59b3b79d655c2ded9b09e1
      organization_id:
      940100925
      name:
      Ringerike Kommune
    heading:
    Kontraktstildeling - Kjøp, tilpasning og levering av to (2) beredskapstanker/nødvannstanker for lagring av drikkevann til Ringerike kommune
    description:
    Oppdragsgiver har behov for to (2) beredskapstanker for lagring av drikkevann.
    location_id:

    1 results

    1. NO085
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    2 results

    1. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    2. RESULT
    status:
    not reported by source
    issueDate:
    2026-08-17T08:36:16Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2026-08-18
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

limit:
25
offset:
0
returned:
7
has_more_results:
no
truncated:
no
Show all fields in HTML
total_count:
7
hits:

7 results

  1. id:
    2023-692324
    buyer:

    1 results

    1. id:
      9480dffdd5dbab17ee98e4ac6633d754
      organization_id:
      963 946 902
      name:
      Kragerø kommune
    heading:
    Nødvannstanker
    description:
    Kragerø kommune skal anskaffe nødvannstanker. Disse skal være på krokløftramme. Tilbyder kan også beskrive aktuelle opsjoner (tilleggsutstyr) i Bilag 4a Prisskjema. Se øvrig om informasjon i Bilag 1 Kravspesifikasjon. Leveringstid: Snarest mulig etter inngått kontrakt.
    location_id:

    3 results

    1. NO094
    2. NO093
    3. NO091
    estimatedValue:
    currencyCode:
    NOK
    amount:
    2000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2023-05-04T10:00:00Z
    deadline:
    2023-05-26T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2023-05-04
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  2. id:
    2026-105716
    buyer:

    2 results

    1. id:
      1bff3bfe0313adec54df6f4a6bbe712b
      organization_id:
      964 965 781
      name:
      OFA IKS
    2. id:
      590855bb1d294b565aeaa6c9ff994df7
      organization_id:
      964965781
      name:
      Tvedestrand kommune
    heading:
    Nødvannstank
    description:
    Tvedestrand kommune skal anskaffe nødvannstank på cirka 10 000 liter, med integrert pumpesystem og nødstrøm. Tanken skal være på krokløftramme.
    location_id:

    1 results

    1. NO092
    estimatedValue:
    currencyCode:
    NOK
    amount:
    1300000.0
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    2 results

    1. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    2. RESULT
    status:
    not reported by source
    issueDate:
    2026-03-23T13:38:48Z
    deadline:
    2026-02-13T00:00:00Z
    sentToTed:
    yes
    publicationDate:
    2026-03-25
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

  3. id:
    2026-102204
    buyer:

    2 results

    1. id:
      1bff3bfe0313adec54df6f4a6bbe712b
      organization_id:
      964 965 781
      name:
      OFA IKS
    2. id:
      590855bb1d294b565aeaa6c9ff994df7
      organization_id:
      964965781
      name:
      Tvedestrand kommune
    heading:
    Nødvannstank
    description:
    Tvedestrand kommune skal anskaffe nødvannstank på cirka 10 000 liter, med integrert pumpesystem og nødstrøm. Tanken skal være på krokløftramme.
    location_id:

    1 results

    1. NO092
    estimatedValue:
    currencyCode:
    NOK
    amount:
    1300000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    AWARDED
    issueDate:
    2026-01-28T22:31:11Z
    deadline:
    2026-02-13T22:59:00Z
    sentToTed:
    yes
    publicationDate:
    2026-01-30
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

  4. id:
    2021-374361
    buyer:

    1 results

    1. id:
      286d35cc0eae1c7a8e97e72a98f2b28a
      organization_id:
      972 417 971
      name:
      Harstad kommune
    heading:
    Anskaffelse av nødvannstank
    description:
    Tank med krokløft til nødvannsforsyning. Tank på henger.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2021-01-05T10:00:00Z
    deadline:
    2021-01-29T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2021-01-05
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  5. id:
    2020-311002
    buyer:

    1 results

    1. id:
      b3db51b4620ae8fe99ad34c43fdb69c0
      organization_id:
      988 783 196
      name:
      Vadsø Vann og Avløp KF
    heading:
    Innkjøp av nødvannstank
    description:
    Innkjøp av nødvannstank som kan fraktes rundt på forskjellige plasser for levering av Nødvann.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2020-05-19T10:00:00Z
    deadline:
    2020-06-08T10:00:00Z
    sentToTed:
    yes
    publicationDate:
    2020-05-19
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  6. id:
    2026-107251
    buyer:

    1 results

    1. id:
      3b72c6f21b59b3b79d655c2ded9b09e1
      organization_id:
      940100925
      name:
      Ringerike Kommune
    heading:
    Kjøp, tilpasning og levering av to (2) beredskapstanker/nødvannstanker for lagring av drikkevann til Ringerike kommune
    description:
    Oppdragsgiver har behov for to (2) beredskapstanker for lagring av drikkevann.
    location_id:

    1 results

    1. NO085
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    AWARDED
    issueDate:
    2026-04-21T10:43:00Z
    deadline:
    2026-05-26T10:00:00Z
    sentToTed:
    yes
    publicationDate:
    2026-04-22
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

  7. id:
    2026-113103
    buyer:

    1 results

    1. id:
      3b72c6f21b59b3b79d655c2ded9b09e1
      organization_id:
      940100925
      name:
      Ringerike Kommune
    heading:
    Kontraktstildeling - Kjøp, tilpasning og levering av to (2) beredskapstanker/nødvannstanker for lagring av drikkevann til Ringerike kommune
    description:
    Oppdragsgiver har behov for to (2) beredskapstanker for lagring av drikkevann.
    location_id:

    1 results

    1. NO085
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    2 results

    1. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    2. RESULT
    status:
    not reported by source
    issueDate:
    2026-08-17T08:36:16Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2026-08-18
    placeOfPerformance:
    procurementStrategicLabels:

    No results.

limit:
25
offset:
0
returned:
7
has_more_results:
no
truncated:
no
Will you use the result in generated code?

Open the same result as JSON

Is data missing or incorrect? Send feedback about this result.

Continue exploring

How an AI agent should use this page

Ground rule: Navigate with HTML GET links to keep explanations and relationships. Use the page's JSON alternative only when concrete values must be extracted, compared or computed.

How to use the search_doffin lookup

  1. Replace the placeholders in the HTML GET template; remove optional parameters you do not need.
  2. Check types, units, limits and ID formats in the parameter table.
  3. Follow linked results to canonical pages before combining sources.

Misreading to avoid: An empty list means "no results for this lookup". An error message or unavailable source does not mean the data does not exist.

Source-specific next step

Go to the source page for other operations. Use the JSON template only after the HTML result shows that the parameters and source are correct.