diff --git a/core/base-service/service-definitions.js b/core/base-service/service-definitions.js
index 597414a3aa..b38b04efae 100644
--- a/core/base-service/service-definitions.js
+++ b/core/base-service/service-definitions.js
@@ -2,6 +2,9 @@
 
 const Joi = require('joi')
 
+// This should be kept in sync with the schema in
+// `frontend/lib/service-definitions/service-definition-prop-types.js`.
+
 const arrayOfStrings = Joi.array()
   .items(Joi.string())
   .allow([])
diff --git a/frontend/components/badge-examples.js b/frontend/components/badge-examples.js
index 929a7f1f24..d6e9efd353 100644
--- a/frontend/components/badge-examples.js
+++ b/frontend/components/badge-examples.js
@@ -5,6 +5,7 @@ import {
   badgeUrlFromPath,
   staticBadgeUrl,
 } from '../../core/badge-urls/make-badge-url'
+import { serviceDefinitionPropType } from '../lib/service-definitions/service-definition-prop-types'
 import { Badge } from './common'
 import { StyledCode } from './snippet'
 
@@ -28,7 +29,7 @@ const ClickableCode = styled(StyledCode)`
 
 export default class BadgeExamples extends React.Component {
   static propTypes = {
-    definitions: PropTypes.array.isRequired,
+    definitions: PropTypes.arrayOf(serviceDefinitionPropType).isRequired,
     baseUrl: PropTypes.string,
     onClick: PropTypes.func.isRequired,
   }
diff --git a/frontend/components/customizer/customizer.js b/frontend/components/customizer/customizer.js
index b3e35540f6..dd533d5e41 100644
--- a/frontend/components/customizer/customizer.js
+++ b/frontend/components/customizer/customizer.js
@@ -3,6 +3,7 @@ import PropTypes from 'prop-types'
 import clipboardCopy from 'clipboard-copy'
 import { staticBadgeUrl } from '../../../core/badge-urls/make-badge-url'
 import { generateMarkup } from '../../lib/generate-image-markup'
+import { objectOfKeyValuesPropType } from '../../lib/service-definitions/service-definition-prop-types'
 import { Badge } from '../common'
 import PathBuilder from './path-builder'
 import QueryStringBuilder from './query-string-builder'
@@ -11,14 +12,11 @@ import CopiedContentIndicator from './copied-content-indicator'
 
 export default class Customizer extends React.Component {
   static propTypes = {
-    // This is an item from the `examples` array within the
-    // `serviceDefinition` schema.
-    // https://github.com/badges/shields/blob/master/services/service-definitions.js
     baseUrl: PropTypes.string.isRequired,
     title: PropTypes.string.isRequired,
     pattern: PropTypes.string.isRequired,
-    exampleNamedParams: PropTypes.object.isRequired,
-    exampleQueryParams: PropTypes.object.isRequired,
+    exampleNamedParams: objectOfKeyValuesPropType,
+    exampleQueryParams: objectOfKeyValuesPropType,
     initialStyle: PropTypes.string,
   }
 
diff --git a/frontend/components/customizer/path-builder.js b/frontend/components/customizer/path-builder.js
index 878dc4fd63..a27011a99c 100644
--- a/frontend/components/customizer/path-builder.js
+++ b/frontend/components/customizer/path-builder.js
@@ -3,6 +3,7 @@ import PropTypes from 'prop-types'
 import styled, { css } from 'styled-components'
 import pathToRegexp from 'path-to-regexp'
 import humanizeString from 'humanize-string'
+import { objectOfKeyValuesPropType } from '../../lib/service-definitions/service-definition-prop-types'
 import { patternToOptions } from '../../lib/pattern-helpers'
 import { noAutocorrect, StyledInput } from '../common'
 import {
@@ -70,7 +71,7 @@ const NamedParamCaption = styled(BuilderCaption)`
 export default class PathBuilder extends React.Component {
   static propTypes = {
     pattern: PropTypes.string.isRequired,
-    exampleParams: PropTypes.object.isRequired,
+    exampleParams: objectOfKeyValuesPropType,
     onChange: PropTypes.func,
   }
 
diff --git a/frontend/components/customizer/query-string-builder.js b/frontend/components/customizer/query-string-builder.js
index 15583c22d9..d27e925da4 100644
--- a/frontend/components/customizer/query-string-builder.js
+++ b/frontend/components/customizer/query-string-builder.js
@@ -4,6 +4,7 @@ import styled from 'styled-components'
 import humanizeString from 'humanize-string'
 import { stringify as stringifyQueryString } from 'query-string'
 import { advertisedStyles } from '../../../supported-features.json'
+import { objectOfKeyValuesPropType } from '../../lib/service-definitions/service-definition-prop-types'
 import { noAutocorrect, StyledInput } from '../common'
 import {
   BuilderContainer,
@@ -280,7 +281,7 @@ export default class QueryStringBuilder extends React.Component {
   }
 }
 QueryStringBuilder.propTypes = {
-  exampleParams: PropTypes.object.isRequired,
+  exampleParams: objectOfKeyValuesPropType,
   initialStyle: PropTypes.string,
   onChange: PropTypes.func,
 }
diff --git a/frontend/components/markup-modal/index.js b/frontend/components/markup-modal/index.js
index 246d5e555e..1375cebeee 100644
--- a/frontend/components/markup-modal/index.js
+++ b/frontend/components/markup-modal/index.js
@@ -2,6 +2,7 @@ import React from 'react'
 import PropTypes from 'prop-types'
 import Modal from 'react-modal'
 import styled from 'styled-components'
+import { examplePropType } from '../../lib/service-definitions/service-definition-prop-types'
 import { BaseFont } from '../common'
 import MarkupModalContent from './markup-modal-content'
 
@@ -11,10 +12,7 @@ const ContentContainer = styled(BaseFont)`
 
 export default class MarkupModal extends React.Component {
   static propTypes = {
-    // This is an item from the `examples` array within the
-    // `serviceDefinition` schema.
-    // https://github.com/badges/shields/blob/master/services/service-definitions.js
-    example: PropTypes.object,
+    example: examplePropType,
     baseUrl: PropTypes.string.isRequired,
     onRequestClose: PropTypes.func.isRequired,
   }
diff --git a/frontend/components/markup-modal/markup-modal-content.js b/frontend/components/markup-modal/markup-modal-content.js
index 89d4ff7423..c6b5265009 100644
--- a/frontend/components/markup-modal/markup-modal-content.js
+++ b/frontend/components/markup-modal/markup-modal-content.js
@@ -1,6 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import styled from 'styled-components'
+import { examplePropType } from '../../lib/service-definitions/service-definition-prop-types'
 import { H3 } from '../common'
 import Customizer from '../customizer/customizer'
 
@@ -11,10 +12,7 @@ const Documentation = styled.div`
 
 export default class MarkupModalContent extends React.Component {
   static propTypes = {
-    // This is an item from the `examples` array within the
-    // `serviceDefinition` schema.
-    // https://github.com/badges/shields/blob/master/services/service-definitions.js
-    example: PropTypes.object,
+    example: examplePropType,
     baseUrl: PropTypes.string.isRequired,
   }
 
diff --git a/frontend/lib/service-definitions/service-definition-prop-types.js b/frontend/lib/service-definitions/service-definition-prop-types.js
new file mode 100644
index 0000000000..02621beeb8
--- /dev/null
+++ b/frontend/lib/service-definitions/service-definition-prop-types.js
@@ -0,0 +1,54 @@
+import PropTypes from 'prop-types'
+
+// This should be kept in sync with the schema in
+// `core/base-service/service-definitions.js`.
+
+const arrayOfStringsPropType = PropTypes.arrayOf(PropTypes.string.isRequired)
+  .isRequired
+const objectOfKeyValuesPropType = PropTypes.objectOf(PropTypes.string)
+  .isRequired
+
+const examplePropType = PropTypes.exact({
+  title: PropTypes.string.isRequired,
+  example: PropTypes.exact({
+    pattern: PropTypes.string.isRequired,
+    namedParams: objectOfKeyValuesPropType,
+    queryParams: objectOfKeyValuesPropType,
+  }).isRequired,
+  preview: PropTypes.exact({
+    label: PropTypes.string,
+    message: PropTypes.string.isRequired,
+    color: PropTypes.string.isRequired,
+    style: PropTypes.string,
+    namedLogo: PropTypes.string,
+  }).isRequired,
+  keywords: arrayOfStringsPropType,
+  documentation: PropTypes.exact({
+    __html: PropTypes.string.isRequired,
+  }),
+})
+
+const serviceDefinitionPropType = PropTypes.exact({
+  category: PropTypes.string.isRequired,
+  name: PropTypes.string.isRequired,
+  isDeprecated: PropTypes.bool.isRequired,
+  // Route is missing for e.g. Buildkite.
+  route: PropTypes.oneOfType([
+    PropTypes.exact({
+      pattern: PropTypes.string.isRequired,
+      queryParams: arrayOfStringsPropType,
+    }),
+    PropTypes.exact({
+      format: PropTypes.string.isRequired,
+      queryParams: arrayOfStringsPropType,
+    }),
+  ]),
+  examples: PropTypes.arrayOf(examplePropType).isRequired,
+}).isRequired
+
+export {
+  arrayOfStringsPropType,
+  objectOfKeyValuesPropType,
+  examplePropType,
+  serviceDefinitionPropType,
+}