Facebook · API Governance Rules

Facebook API Rules

Spectral linting rules defining API design standards and conventions for Facebook.

33 Rules error 13 warn 15 info 5
View Rules File View on GitHub

Rule Categories

delete examples get info no openapi operation pagination parameter paths query response schema security servers

Rules

error
info-title-required
Info title must be present.
$.info
warn
info-title-prefix
Info title should start with Facebook.
$.info.title
error
info-description-required
Info description must be present.
$.info
error
info-version-required
Info version must be present.
$.info
warn
info-contact-required
Contact information should be provided.
$.info
warn
openapi-version
OpenAPI version should be 3.0.x.
$
error
servers-defined
Servers array must be defined.
$
warn
servers-https
Server URLs should use HTTPS.
$.servers[*].url
error
paths-no-trailing-slash
Paths should not have trailing slashes.
$.paths
error
operation-operationid-required
Every operation must have an operationId.
$.paths[*][get,post,put,patch,delete]
error
operation-summary-required
Every operation must have a summary.
$.paths[*][get,post,put,patch,delete]
warn
operation-summary-prefix
Operation summaries should start with Facebook.
$.paths[*][get,post,put,patch,delete].summary
warn
operation-description-required
Every operation must have a description.
$.paths[*][get,post,put,patch,delete]
warn
operation-tags-required
Every operation must have tags.
$.paths[*][get,post,put,patch,delete]
warn
operation-operationid-camelcase
OperationId should be camelCase.
$.paths[*][get,post,put,patch,delete].operationId
warn
parameter-description-required
Every parameter must have a description.
$.paths[*][get,post,put,patch,delete].parameters[*]
info
parameter-snake-case
Parameter names should use snake_case or kebab-case.
$.paths[*][get,post,put,patch,delete].parameters[*].name
error
response-success-required
Operations must have a success response (2xx).
$.paths[*][get,post,put,patch,delete].responses
warn
response-description-required
Every response must have a description.
$.paths[*][get,post,put,patch,delete].responses[*]
info
schema-properties-snake-case
Schema property names should use snake_case.
$.components.schemas[*].properties
warn
schema-description-required
Top-level schemas should have descriptions.
$.components.schemas[*]
error
schema-type-required
Schemas must have a type defined.
$.components.schemas[*]
error
security-defined
Global security must be defined.
$
error
security-schemes-defined
Security schemes must be defined in components.
$.components
info
security-bearer-scheme
Bearer authentication should be used.
$.components.securitySchemes[*]
error
get-no-request-body
GET operations should not have a request body.
$.paths[*].get
warn
delete-no-request-body
DELETE operations should not have a request body.
$.paths[*].delete
error
no-empty-descriptions
Descriptions must not be empty strings.
$..description
info
examples-encouraged
Schema properties should include example values.
$.components.schemas[*].properties[*]
info
pagination-cursor-pattern
Pagination should use cursor-based pagination with before/after.
$.components.schemas.Paging
warn
servers-expected-domain
Server URLs should be on the facebook.com domain.
$.servers[*].url
warn
query-params-casing
Query parameters should be snake_case (the dominant convention in this API).
$.paths[*][get,post,put,patch,delete].parameters[?(@.in=='query')]
warn
schema-names-casing
Component schema names should be PascalCase (the dominant convention in this API).
$.components.schemas

Spectral Ruleset

Raw ↑ 
# authorship: generated by API Evangelist tooling. Stamped 2026-08-18
# on the file's own generator header (roadmap#64). An unmarked file is
# NOT assumed to be ours -- absence of evidence was never stamped.
x-method: generated
# facebook — Spectral ruleset (strengthened)
# Plain Spectral. Existing hand-authored rules preserved; measured rules added
# from this provider's own OpenAPI conventions by strengthen_ruleset.py,
# then self-validated against the spec.
#
# Provenance:
#   - servers-https-only: 100% of servers already https (error)
#   - servers-expected-domain: 5/6 servers on facebook.com
#   - path-params-casing: kebab @ 100% (n=45)
#   - query-params-casing: snake @ 100% (n=19)
#   - operationid-casing: camel @ 100% (n=47)
#   - schema-names-casing: pascal @ 100% (n=55)
#   - schema-properties-casing: snake @ 100% (n=219)
#   - security: global (root) — NOT emitting operation-security-required
#   - pagination params observed: ['limit']
#   - merge: kept 30 existing, added 3 measured, upgraded 0
#   - added: servers-expected-domain, query-params-casing, schema-names-casing
extends:
  - spectral:oas
rules:
  info-title-required:
    description: Info title must be present.
    given: $.info
    severity: error
    then:
      field: title
      function: truthy
  info-title-prefix:
    description: Info title should start with Facebook.
    given: $.info.title
    severity: warn
    then:
      function: pattern
      functionOptions:
        match: '^Facebook '
  info-description-required:
    description: Info description must be present.
    given: $.info
    severity: error
    then:
      field: description
      function: truthy
  info-version-required:
    description: Info version must be present.
    given: $.info
    severity: error
    then:
      field: version
      function: truthy
  info-contact-required:
    description: Contact information should be provided.
    given: $.info
    severity: warn
    then:
      field: contact
      function: truthy
  openapi-version:
    description: OpenAPI version should be 3.0.x.
    given: $
    severity: warn
    then:
      field: openapi
      function: pattern
      functionOptions:
        match: ^3\.0\.
  servers-defined:
    description: Servers array must be defined.
    given: $
    severity: error
    then:
      field: servers
      function: truthy
  servers-https:
    description: Server URLs should use HTTPS.
    given: $.servers[*].url
    severity: warn
    then:
      function: pattern
      functionOptions:
        match: ^https://
  paths-no-trailing-slash:
    description: Paths should not have trailing slashes.
    given: $.paths
    severity: error
    then:
      field: '@key'
      function: pattern
      functionOptions:
        notMatch: /$
  operation-operationid-required:
    description: Every operation must have an operationId.
    given: $.paths[*][get,post,put,patch,delete]
    severity: error
    then:
      field: operationId
      function: truthy
  operation-summary-required:
    description: Every operation must have a summary.
    given: $.paths[*][get,post,put,patch,delete]
    severity: error
    then:
      field: summary
      function: truthy
  operation-summary-prefix:
    description: Operation summaries should start with Facebook.
    given: $.paths[*][get,post,put,patch,delete].summary
    severity: warn
    then:
      function: pattern
      functionOptions:
        match: '^Facebook '
  operation-description-required:
    description: Every operation must have a description.
    given: $.paths[*][get,post,put,patch,delete]
    severity: warn
    then:
      field: description
      function: truthy
  operation-tags-required:
    description: Every operation must have tags.
    given: $.paths[*][get,post,put,patch,delete]
    severity: warn
    then:
      field: tags
      function: truthy
  operation-operationid-camelcase:
    description: OperationId should be camelCase.
    given: $.paths[*][get,post,put,patch,delete].operationId
    severity: warn
    then:
      function: pattern
      functionOptions:
        match: ^[a-z][a-zA-Z0-9]*$
  parameter-description-required:
    description: Every parameter must have a description.
    given: $.paths[*][get,post,put,patch,delete].parameters[*]
    severity: warn
    then:
      field: description
      function: truthy
  parameter-snake-case:
    description: Parameter names should use snake_case or kebab-case.
    given: $.paths[*][get,post,put,patch,delete].parameters[*].name
    severity: info
    then:
      function: pattern
      functionOptions:
        match: ^[a-z][a-z0-9_\-]*$
  response-success-required:
    description: Operations must have a success response (2xx).
    given: $.paths[*][get,post,put,patch,delete].responses
    severity: error
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
          - required:
            - '200'
          - required:
            - '201'
          - required:
            - '204'
  response-description-required:
    description: Every response must have a description.
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    severity: warn
    then:
      field: description
      function: truthy
  schema-properties-snake-case:
    description: Schema property names should use snake_case.
    given: $.components.schemas[*].properties
    severity: info
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: ^[a-z][a-z0-9_]*$
  schema-description-required:
    description: Top-level schemas should have descriptions.
    given: $.components.schemas[*]
    severity: warn
    then:
      field: description
      function: truthy
  schema-type-required:
    description: Schemas must have a type defined.
    given: $.components.schemas[*]
    severity: error
    then:
      field: type
      function: truthy
  security-defined:
    description: Global security must be defined.
    given: $
    severity: error
    then:
      field: security
      function: truthy
  security-schemes-defined:
    description: Security schemes must be defined in components.
    given: $.components
    severity: error
    then:
      field: securitySchemes
      function: truthy
  security-bearer-scheme:
    description: Bearer authentication should be used.
    given: $.components.securitySchemes[*]
    severity: info
    then:
      field: scheme
      function: pattern
      functionOptions:
        match: ^bearer$
  get-no-request-body:
    description: GET operations should not have a request body.
    given: $.paths[*].get
    severity: error
    then:
      field: requestBody
      function: falsy
  delete-no-request-body:
    description: DELETE operations should not have a request body.
    given: $.paths[*].delete
    severity: warn
    then:
      field: requestBody
      function: falsy
  no-empty-descriptions:
    description: Descriptions must not be empty strings.
    given: $..description
    severity: error
    then:
      function: truthy
  examples-encouraged:
    description: Schema properties should include example values.
    given: $.components.schemas[*].properties[*]
    severity: info
    then:
      field: example
      function: truthy
  pagination-cursor-pattern:
    description: Pagination should use cursor-based pagination with before/after.
    given: $.components.schemas.Paging
    severity: info
    then:
      field: properties
      function: truthy
  servers-expected-domain:
    description: Server URLs should be on the facebook.com domain.
    severity: warn
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: facebook\.com
  query-params-casing:
    description: Query parameters should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[?(@.in=='query')]
    then:
      field: name
      function: casing
      functionOptions:
        type: snake
  schema-names-casing:
    description: Component schema names should be PascalCase (the dominant convention in this API).
    severity: warn
    given: $.components.schemas
    then:
      field: '@key'
      function: casing
      functionOptions:
        type: pascal

Work with this as data

Every ruleset here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for spectral rules

4 MCP tools reach this
  • find_rulesBrowse and filter every ruleset in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This ruleset 
curl "https://apis.io/api/v1/rules/facebook-spectral-rules"
All spectral rules 
curl "https://apis.io/api/v1/rules?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.