Breaknorm
Sign inStart free

Product

SignalsPeopleCompaniesLocal businessesMCP and API

Plays

Post engagersTeam build-outChampion movedHiring surgeNewly fundedLookalikesAll plays

Data

Coverage by countryHiring dataJob changesEmail verificationCompanies by toolWho is hiringMarket mapsOutboundCompany profilesCompare
PricingDatasetsDocsSign in
Tools · Category

api specs data formats, ranked by real usage

As of 4 November 2026, JSON leads api specs data formats with 6,396 companies naming it in job postings, ahead of XML at 5,264.

As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.

Leader
JSON · 6,396
Runner-up
XML · 5,264
Most hiring, 90 days
JSON
Highest postings per company
Redfish
Catalogue
T-1.0.1-prov
38,897companies across the category
16%of them on JSON
106,137postings naming a api specs data format in 90 days
40tools with enough evidence to rank
02Ranking

Every api specs data format we can measure

Companies naming the tool, and postings naming it in the last 90 days. Bars are relative to the leader.

#ToolCompaniescompaniesPostings, 90 dayspostingsper company
1
JSONEcma International
6,396
19,7373.1
2
XMLW3C
5,264
12,8412.4
3
Model Context ProtocolAnthropic
4,892
16,0023.3
4
GraphQLGraphQL Foundation
4,089
12,0763.0
5
SOAPW3C
3,661
10,2432.8
6
gRPCCloud Native Computing Foundation
1,753
4,5712.6
7
OpenAPIOpenAPI Initiative
1,432
3,2452.3
8
YAMLYAML Language Development Team
1,029
2,5692.5
9
Microsoft GraphMicrosoft
942
2,1152.2
10
ODataOASIS
844
3,0733.6
11
XSLTW3C
820
1,5011.8
12
CSVIETF
782
1,1801.5
13
SAP IDocSAP
722
2,7463.8
14
Apache ParquetApache Software Foundation
690
1,2461.8
15
Protocol BuffersGoogle
566
1,1021.9
16
Agent2Agent (A2A) ProtocolLinux Foundation
443
1,5723.5
17
PDFAdobe
405
8392.1
18
ANSI X12ASC X12
371
7612.1
19
Markdown
337
5851.7
20
XML Schema (XSD)W3C
291
5511.9
21
Apache AvroApache Software Foundation
280
5602.0
22
ISO 20022ISO
272
7632.8
23
WSDLW3C
256
5112.0
24
UN/EDIFACTUnited Nations
253
4061.6
25
RDFW3C
221
8133.7
26
Web Ontology LanguageW3C
216
7033.3
27
JSON SchemaJSON Schema organization
169
3011.8
28
H.264ITU-T / ISO
160
3272.0
29
XBRLXBRL International
152
2941.9
30
RedfishDMTF
137
6614.8
31
H.265ITU-T
126
2441.9
32
RSSRSS Advisory Board
122
3212.6
33
Apache ORCApache Software Foundation
118
2352.0
34
tRPCtRPC contributors
106
1881.8
35
RAMLMuleSoft
105
1871.8
36
Schema.orgSchema.org
103
1481.4
37
JSON-LDW3C
99
1461.5
38
DITAOASIS
96
1972.1
39
YANGIETF
89
2863.2
40
OpenUSDAlliance for OpenUSD
88
2913.3
03Head to head

Compare two tools

Same data, two columns: who chooses which by size, industry and country.

JSON vs XML6,396 · 5,264JSON vs Model Context Protocol6,396 · 4,892JSON vs GraphQL6,396 · 4,089JSON vs SOAP6,396 · 3,661JSON vs gRPC6,396 · 1,753XML vs Model Context Protocol5,264 · 4,892XML vs GraphQL5,264 · 4,089XML vs SOAP5,264 · 3,661XML vs gRPC5,264 · 1,753Model Context Protocol vs GraphQL4,892 · 4,089Model Context Protocol vs SOAP4,892 · 3,661Model Context Protocol vs gRPC4,892 · 1,753GraphQL vs SOAP4,089 · 3,661GraphQL vs gRPC4,089 · 1,753SOAP vs gRPC3,661 · 1,753
Cite this

Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.

JSON leads api specs data formats with 6,396 companies naming it in job postings, ahead of XML at 5,264. (Breaknorm, 4 November 2026, https://breaknorm.co/tools/category/api-specs-data-formats)
How we know

Read from the source, not self-reported

Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →

  • CatalogueBreaknorm technology catalogue T-1.0.1-prov: 6,296 tools with vendor and category, editions folded into their parent.
  • CompaniesCompanies whose own postings name the tool as the team's system, any confidence. Candidate wish-lists excluded.
  • 90-day postingsOpen postings first seen or posted in the last 90 days that name the tool.
  • Not countedTools used by teams that do not post jobs, and companies without a career site we can read.
FAQ

api specs data formats: questions

How is this ranking made?

By the number of companies whose own job postings name the tool as the team's system, from the Breaknorm technology catalogue (version T-1.0.1-prov). No vendor paid for a position and no editor chose the order.

Why is this different from review-site rankings?

Review sites rank by reviews collected. This ranks by companies hiring people to work in the tool, which is closer to seats in use. It under-counts tools used by teams that rarely post jobs.

What about product editions?

Editions and sub-products () are counted under the parent so no company is counted twice.

Can I get the companies behind a number?

Yes: click a tool, see the first 20, and sign up for the full list with verified e-mails. Counting is free.

Companies and people

Get the companies your way

The same data as a search, over MCP and the API, as bulk files, or pushed to you as it changes.

SearchCompany searchFilter on what a company actually does→SearchPeople searchDecision makers, normalized and verified→MCP and APICompanies over MCP and APICount, search and export from your agent→DatasetCompany and People datasetThe whole market in your warehouse→DataCoverage by countryCheck your market before you start→SearchLocal businessesThe same database, by category and city→

Every company on every tool,
ranked by what they say

Connect the MCP server, ask which companies run a tool. Start free, no card.

Start free
  1. 01Sign up, no card
  2. 02Connect Claude, ChatGPT or an API key
  3. 03Ask for your market