diff --git a/packages/@contentlayer/cli/package.json b/packages/@contentlayer/cli/package.json
index 216bb0d0..576a0107 100644
--- a/packages/@contentlayer/cli/package.json
+++ b/packages/@contentlayer/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/cli",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/packages/@contentlayer/client/package.json b/packages/@contentlayer/client/package.json
index 9cd81bf1..d3a483de 100644
--- a/packages/@contentlayer/client/package.json
+++ b/packages/@contentlayer/client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/client",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/packages/@contentlayer/core/package.json b/packages/@contentlayer/core/package.json
index e8ae7080..16ce7131 100644
--- a/packages/@contentlayer/core/package.json
+++ b/packages/@contentlayer/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/core",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/packages/@contentlayer/source-contentful/package.json b/packages/@contentlayer/source-contentful/package.json
index f23976d9..79a208fd 100644
--- a/packages/@contentlayer/source-contentful/package.json
+++ b/packages/@contentlayer/source-contentful/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/source-contentful",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/packages/@contentlayer/source-files/package.json b/packages/@contentlayer/source-files/package.json
index 3db90f3a..3ae6ade2 100644
--- a/packages/@contentlayer/source-files/package.json
+++ b/packages/@contentlayer/source-files/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/source-files",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": {
     ".": {
diff --git a/packages/@contentlayer/source-files/src/errors/index.ts b/packages/@contentlayer/source-files/src/errors/index.ts
index 6acd66f0..ff52355e 100644
--- a/packages/@contentlayer/source-files/src/errors/index.ts
+++ b/packages/@contentlayer/source-files/src/errors/index.ts
@@ -6,6 +6,10 @@ import { handleFetchDataErrors } from './aggregate.js'
 
 export namespace FetchDataError {
   export type FetchDataError =
+    | InvalidFrontmatterError
+    | InvalidMarkdownFileError
+    | InvalidYamlFileError
+    | InvalidJsonFileError
     | ComputedValueError
     | UnsupportedFileExtension
     | NoSuchDocumentTypeError
@@ -26,6 +30,63 @@ export namespace FetchDataError {
 
   type InvalidDataErrorKind = 'UnknownDocument' | 'ExtraFieldData' | 'MissingOrIncompatibleData' | 'Unexpected'
 
+  export class InvalidFrontmatterError
+    extends Tagged('InvalidFrontmatterError')<{
+      readonly error: unknown
+      readonly documentFilePath: string
+    }>
+    implements AggregatableError
+  {
+    kind: InvalidDataErrorKind = 'MissingOrIncompatibleData'
+
+    renderHeadline: RenderHeadline = ({ documentCount }) =>
+      `Invalid frontmatter data found for ${documentCount} documents.`
+
+    renderLine = () => `"${this.documentFilePath}" failed with ${errorToString(this.error)}`
+  }
+
+  export class InvalidMarkdownFileError
+    extends Tagged('InvalidMarkdownFileError')<{
+      readonly error: unknown
+      readonly documentFilePath: string
+    }>
+    implements AggregatableError
+  {
+    kind: InvalidDataErrorKind = 'MissingOrIncompatibleData'
+
+    renderHeadline: RenderHeadline = ({ documentCount }) => `Invalid markdown in ${documentCount} documents.`
+
+    renderLine = () => `"${this.documentFilePath}" failed with ${errorToString(this.error)}`
+  }
+
+  export class InvalidYamlFileError
+    extends Tagged('InvalidYamlFileError')<{
+      readonly error: unknown
+      readonly documentFilePath: string
+    }>
+    implements AggregatableError
+  {
+    kind: InvalidDataErrorKind = 'MissingOrIncompatibleData'
+
+    renderHeadline: RenderHeadline = ({ documentCount }) => `Invalid YAML data in ${documentCount} documents.`
+
+    renderLine = () => `"${this.documentFilePath}" failed with ${errorToString(this.error)}`
+  }
+
+  export class InvalidJsonFileError
+    extends Tagged('InvalidJsonFileError')<{
+      readonly error: unknown
+      readonly documentFilePath: string
+    }>
+    implements AggregatableError
+  {
+    kind: InvalidDataErrorKind = 'MissingOrIncompatibleData'
+
+    renderHeadline: RenderHeadline = ({ documentCount }) => `Invalid JSON data in ${documentCount} documents.`
+
+    renderLine = () => `"${this.documentFilePath}" failed with ${errorToString(this.error)}`
+  }
+
   export class ComputedValueError
     extends Tagged('ComputedValueError')<{
       readonly error: unknown
diff --git a/packages/@contentlayer/source-files/src/fetchData/fetchAllDocuments.ts b/packages/@contentlayer/source-files/src/fetchData/fetchAllDocuments.ts
index c6ff2236..3cbe6e44 100644
--- a/packages/@contentlayer/source-files/src/fetchData/fetchAllDocuments.ts
+++ b/packages/@contentlayer/source-files/src/fetchData/fetchAllDocuments.ts
@@ -110,9 +110,7 @@ export const makeCacheItemFromFilePath = ({
 
       const rawContent = yield* $(processRawContent({ fullFilePath, relativeFilePath }))
 
-      const {
-        tuple: [{ documentTypeDef }, warnings],
-      } = yield* $(
+      const [{ documentTypeDef }, warnings] = yield* $(
         pipe(
           validateDocumentData({
             rawContent,
@@ -122,6 +120,7 @@ export const makeCacheItemFromFilePath = ({
             options,
           }),
           These.toEffect,
+          T.map((_) => _.tuple),
         ),
       )
 
@@ -169,7 +168,13 @@ const processRawContent = ({
   relativeFilePath: string
 }): T.Effect<
   OT.HasTracer,
-  FetchDataError.UnsupportedFileExtension | fs.FileNotFoundError | fs.ReadFileError,
+  | FetchDataError.UnsupportedFileExtension
+  | FetchDataError.InvalidFrontmatterError
+  | FetchDataError.InvalidMarkdownFileError
+  | FetchDataError.InvalidJsonFileError
+  | FetchDataError.InvalidYamlFileError
+  | fs.FileNotFoundError
+  | fs.ReadFileError,
   RawContent
 > =>
   pipe(
@@ -179,18 +184,22 @@ const processRawContent = ({
 
       switch (filePathExtension) {
         case 'md': {
-          const markdown = matter(fileContent)
+          const markdown = yield* $(parseMarkdown({ markdownString: fileContent, documentFilePath: relativeFilePath }))
           return { kind: 'markdown' as const, fields: markdown.data, body: markdown.content }
         }
         case 'mdx': {
-          const markdown = matter(fileContent)
+          const markdown = yield* $(parseMarkdown({ markdownString: fileContent, documentFilePath: relativeFilePath }))
           return { kind: 'mdx' as const, fields: markdown.data, body: markdown.content }
         }
-        case 'json':
-          return { kind: 'json' as const, fields: JSON.parse(fileContent) }
+        case 'json': {
+          const fields = yield* $(parseJson({ jsonString: fileContent, documentFilePath: relativeFilePath }))
+          return { kind: 'json' as const, fields }
+        }
         case 'yaml':
-        case 'yml':
-          return { kind: 'yaml' as const, fields: yaml.parse(fileContent) }
+        case 'yml': {
+          const fields = yield* $(parseYaml({ yamlString: fileContent, documentFilePath: relativeFilePath }))
+          return { kind: 'yaml' as const, fields }
+        }
         default:
           return yield* $(
             T.fail(
@@ -239,3 +248,49 @@ const getAllRelativeFilePaths = ({
     (error) => new fs.UnknownFSError({ error }),
   )
 }
+
+const parseMarkdown = ({
+  markdownString,
+  documentFilePath,
+}: {
+  markdownString: string
+  documentFilePath: string
+}): T.Effect<
+  unknown,
+  FetchDataError.InvalidMarkdownFileError | FetchDataError.InvalidFrontmatterError,
+  matter.GrayMatterFile<string>
+> =>
+  T.tryCatch(
+    () => matter(markdownString),
+    (error: any) => {
+      if (error.name === 'YAMLException') {
+        return new FetchDataError.InvalidFrontmatterError({ error, documentFilePath })
+      } else {
+        return new FetchDataError.InvalidMarkdownFileError({ error, documentFilePath })
+      }
+    },
+  )
+
+const parseJson = ({
+  jsonString,
+  documentFilePath,
+}: {
+  jsonString: string
+  documentFilePath: string
+}): T.Effect<unknown, FetchDataError.InvalidJsonFileError, Record<string, any>> =>
+  T.tryCatch(
+    () => JSON.parse(jsonString),
+    (error) => new FetchDataError.InvalidJsonFileError({ error, documentFilePath }),
+  )
+
+const parseYaml = ({
+  yamlString,
+  documentFilePath,
+}: {
+  yamlString: string
+  documentFilePath: string
+}): T.Effect<unknown, FetchDataError.InvalidYamlFileError, Record<string, any>> =>
+  T.tryCatch(
+    () => yaml.parse(yamlString),
+    (error) => new FetchDataError.InvalidYamlFileError({ error, documentFilePath }),
+  )
diff --git a/packages/@contentlayer/source-sanity/package.json b/packages/@contentlayer/source-sanity/package.json
index ab380eae..36f81bd1 100644
--- a/packages/@contentlayer/source-sanity/package.json
+++ b/packages/@contentlayer/source-sanity/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/source-sanity",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/packages/@contentlayer/utils/package.json b/packages/@contentlayer/utils/package.json
index b25dce92..71a3bb0f 100644
--- a/packages/@contentlayer/utils/package.json
+++ b/packages/@contentlayer/utils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentlayer/utils",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "exports": {
     "./package.json": {
diff --git a/packages/contentlayer-stackbit-yaml-generator/package.json b/packages/contentlayer-stackbit-yaml-generator/package.json
index 07db7afd..422a33ca 100644
--- a/packages/contentlayer-stackbit-yaml-generator/package.json
+++ b/packages/contentlayer-stackbit-yaml-generator/package.json
@@ -1,6 +1,6 @@
 {
   "name": "contentlayer-stackbit-yaml-generator",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "bin": "./dist/cli/index.js",
   "exports": "./dist/lib/index.js",
diff --git a/packages/contentlayer/package.json b/packages/contentlayer/package.json
index ce0c9782..f229cc1b 100644
--- a/packages/contentlayer/package.json
+++ b/packages/contentlayer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "contentlayer",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "bin": "./bin/cli.cjs",
   "type": "module",
   "exports": {
diff --git a/packages/next-contentlayer/package.json b/packages/next-contentlayer/package.json
index 43140108..1a123922 100644
--- a/packages/next-contentlayer/package.json
+++ b/packages/next-contentlayer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "next-contentlayer",
-  "version": "0.0.26",
+  "version": "0.0.27",
   "type": "module",
   "main": "./dist/cjs/index.cjs",
   "exports": {