diff --git a/swh/indexer/codemeta.py b/swh/indexer/codemeta.py
--- a/swh/indexer/codemeta.py
+++ b/swh/indexer/codemeta.py
@@ -71,7 +71,6 @@
         raise ValueError("empty file")
 
     data_sources = set(header) - {"Parent Type", "Property", "Type", "Description"}
-    assert "codemeta-V1" in data_sources
 
     codemeta_translation = {data_source: {} for data_source in data_sources}
     terms = set()
diff --git a/swh/indexer/data/composer.csv b/swh/indexer/data/composer.csv
new file mode 100644
--- /dev/null
+++ b/swh/indexer/data/composer.csv
@@ -0,0 +1,68 @@
+Property,Composer
+codeRepository,support.source
+programmingLanguage,
+runtimePlatform,
+targetProduct,
+applicationCategory,
+applicationSubCategory,
+downloadUrl,
+fileSize,
+installUrl,
+memoryRequirements,
+operatingSystem,
+permissions,
+processorRequirements,
+releaseNotes,
+softwareHelp,
+softwareRequirements,require
+softwareVersion,version
+storageRequirements,
+supportingData,
+author,authors
+citation,
+contributor,
+copyrightHolder,
+copyrightYear,
+dateCreated,
+dateModified,
+datePublished,
+editor,
+encoding,
+fileFormat,
+funder,
+keywords,keywords
+license,license
+producer,
+provider,
+publisher,
+sponsor,
+version,version
+isAccessibleForFree,
+isPartOf,
+hasPart,
+position,
+description,description
+identifier,name
+name,name
+sameAs,
+url,homepage
+relatedLink,
+givenName,
+familyName,
+email,author.email
+affiliation,
+identifier,
+name,author.name
+address,
+type,
+id,
+softwareSuggestions,suggest
+maintainer,
+contIntegration,
+buildInstructions,
+developmentStatus,
+embargoDate,
+funding,
+issueTracker,support.issues
+referencePublication,
+readme,
\ No newline at end of file
diff --git a/swh/indexer/metadata_dictionary/__init__.py b/swh/indexer/metadata_dictionary/__init__.py
--- a/swh/indexer/metadata_dictionary/__init__.py
+++ b/swh/indexer/metadata_dictionary/__init__.py
@@ -7,7 +7,7 @@
 
 import click
 
-from . import cff, codemeta, github, maven, npm, python, ruby
+from . import cff, codemeta, composer, github, maven, npm, python, ruby
 
 MAPPINGS = {
     "CffMapping": cff.CffMapping,
@@ -17,6 +17,7 @@
     "MavenMapping": maven.MavenMapping,
     "NpmMapping": npm.NpmMapping,
     "PythonPkginfoMapping": python.PythonPkginfoMapping,
+    "ComposerMapping": composer.ComposerMapping,
 }
 
 
diff --git a/swh/indexer/metadata_dictionary/composer.py b/swh/indexer/metadata_dictionary/composer.py
new file mode 100644
--- /dev/null
+++ b/swh/indexer/metadata_dictionary/composer.py
@@ -0,0 +1,56 @@
+# Copyright (C) 2022  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+import os.path
+
+from swh.indexer.codemeta import _DATA_DIR, SCHEMA_URI, _read_crosstable
+
+from .base import JsonMapping
+
+COMPOSER_TABLE_PATH = os.path.join(_DATA_DIR, "composer.csv")
+
+with open(COMPOSER_TABLE_PATH) as fd:
+    (CODEMETA_TERMS, COMPOSER_TABLE) = _read_crosstable(fd)
+
+
+class ComposerMapping(JsonMapping):
+    """Dedicated class for Packagist(composer.json) mapping and translation"""
+
+    name = "composer"
+    mapping = COMPOSER_TABLE["Composer"]
+    filename = b"composer.json"
+    string_fields = [
+        "name",
+        "description",
+        "version",
+        "keywords",
+        "homepage",
+        "license",
+        "author",
+        "authors",
+    ]
+
+    def normalize_homepage(self, s):
+        if isinstance(s, str):
+            return {"@id": s}
+
+    def normalize_license(self, s):
+        if isinstance(s, str):
+            return {"@id": "https://spdx.org/licenses/" + s}
+
+    def normalize_authors(self, author_list):
+        authors = []
+        for author in author_list:
+            author_obj = {"@type": SCHEMA_URI + "Person"}
+
+            if isinstance(author, dict):
+                if isinstance(author.get("name", None), str):
+                    author_obj[SCHEMA_URI + "name"] = author.get("name", None)
+                if isinstance(author.get("email", None), str):
+                    author_obj[SCHEMA_URI + "email"] = author.get("email", None)
+
+                authors.append(author_obj)
+
+        return {"@list": authors}
diff --git a/swh/indexer/tests/metadata_dictionary/test_composer.py b/swh/indexer/tests/metadata_dictionary/test_composer.py
new file mode 100644
--- /dev/null
+++ b/swh/indexer/tests/metadata_dictionary/test_composer.py
@@ -0,0 +1,84 @@
+# Copyright (C) 2017-2022  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+from swh.indexer.metadata_dictionary import MAPPINGS
+
+
+def test_compute_metadata_composer(self):
+    raw_content = """{
+"name": "symfony/polyfill-mbstring",
+"type": "library",
+"description": "Symfony polyfill for the Mbstring extension",
+"keywords": [
+    "polyfill",
+    "shim",
+    "compatibility",
+    "portable"
+],
+"homepage": "https://symfony.com",
+"license": "MIT",
+"authors": [
+    {
+        "name": "Nicolas Grekas",
+        "email": "p@tchwork.com"
+    },
+    {
+        "name": "Symfony Community",
+        "homepage": "https://symfony.com/contributors"
+    }
+],
+"require": {
+    "php": ">=7.1"
+},
+"provide": {
+    "ext-mbstring": "*"
+},
+"autoload": {
+    "files": [
+        "bootstrap.php"
+    ]
+},
+"suggest": {
+    "ext-mbstring": "For best performance"
+},
+"minimum-stability": "dev",
+"extra": {
+    "branch-alias": {
+        "dev-main": "1.26-dev"
+    },
+    "thanks": {
+        "name": "symfony/polyfill",
+        "url": "https://github.com/symfony/polyfill"
+    }
+}
+}
+    """.encode(
+        "utf-8"
+    )
+
+    result = MAPPINGS["ComposerMapping"]().translate(raw_content)
+
+    expected = {
+        "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
+        "type": "SoftwareSourceCode",
+        "name": "symfony/polyfill-mbstring",
+        "keywords": ["polyfill", "shim", "compatibility", "portable"],
+        "description": "Symfony polyfill for the Mbstring extension",
+        "url": "https://symfony.com",
+        "license": "https://spdx.org/licenses/MIT",
+        "author": [
+            {
+                "type": "Person",
+                "name": "Nicolas Grekas",
+                "email": "p@tchwork.com",
+            },
+            {
+                "type": "Person",
+                "name": "Symfony Community",
+            },
+        ],
+    }
+
+    assert result == expected
diff --git a/swh/indexer/tests/test_cli.py b/swh/indexer/tests/test_cli.py
--- a/swh/indexer/tests/test_cli.py
+++ b/swh/indexer/tests/test_cli.py
@@ -95,6 +95,7 @@
         [
             "cff",
             "codemeta",
+            "composer",
             "gemspec",
             "github",
             "maven",