diff --git a/.changeset/lemon-bottles-act.md b/.changeset/lemon-bottles-act.md
new file mode 100644
index 0000000..7e2a9e5
--- /dev/null
+++ b/.changeset/lemon-bottles-act.md
@@ -0,0 +1,5 @@
+---
+'@chialab/plasma': minor
+---
+
+Do not require a package.json anymore.
diff --git a/README.md b/README.md
index 6187d16..216f985 100644
--- a/README.md
+++ b/README.md
@@ -18,10 +18,7 @@ Generate Custom Elements wrappers for Angular, React, Svelte and Vue.
 
 Plasma transformations are based on [Custom Element Manifest](https://github.com/webcomponents/custom-elements-manifest) (CEM) specifications. The CEM is a JSON files that describes a Custom Element, its properties, events and slots. Plasma uses the CEM to generate wrappers for the supported frameworks.
 
-In order to run the `plasma` cli you need:
-
--   a `package.json` file. Plasma uses the `name` field to import the Custom Element definition and the `customElements` field to detect the CEM file;
--   a CEM file. You can generate the CEM for most of the Web Components library using this [Analyzer](https://github.com/open-wc/custom-elements-manifest/tree/master/packages/analyzer).
+You can generate the CEM for most of the Web Components library using this [Analyzer](https://github.com/open-wc/custom-elements-manifest/tree/master/packages/analyzer).
 
 ## Installation
 
@@ -40,19 +37,18 @@ npm run plasma
 ### Options
 
 ```
-npm run plasma --help
-
 Usage: plasma [options] <input>
 
 Generate Custom Elements wrappers for Angular, React, Svelte and Vue.
 
 Arguments:
-  input                             source directory
+  input                             custom elements manifest path
 
 Options:
   -V, --version                     output the version number
-  -f, --frameworks <frameworks...>  the framework to convert to
+  -e, --entrypoint <path>           entrypoint to the package
   -o, --outdir <outdir>             output directory
+  -f, --frameworks <frameworks...>  the framework to convert to
   -y, --yes                         convert all candidates to all available frameworks
   -h, --help                        display help for command
 ```
diff --git a/package.json b/package.json
index c115c3d..082bf0a 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "build": "yarn clear && tsc --project tsconfig.build.json && node scripts/build.js",
     "lint": "prettier --check . && eslint .",
     "test:manifest": "custom-elements-manifest analyze --config ./test/cem.config.mjs --outdir test",
-    "test:generate": "./dist/cli.js test --outdir 'test/src/[framework]' -y",
+    "test:generate": "./dist/cli.js test --entrypoint 'plasma-test' --outdir 'test/src/[framework]' -y",
     "test": "vitest",
     "prepack": "yarn build && publint"
   },
@@ -65,7 +65,6 @@
     "eslint": "^8.0.0",
     "jsdom": "^23.0.0",
     "listr2": "^7.0.2",
-    "package-up": "^5.0.0",
     "preact": "^10.19.2",
     "prettier": "^3.0.0",
     "prompts": "^2.4.0",
diff --git a/src/cli.ts b/src/cli.ts
index cc18155..145fb52 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -5,10 +5,9 @@ import { fileURLToPath } from 'node:url';
 import chalk from 'chalk';
 import { program } from 'commander';
 import { Listr } from 'listr2';
-import { packageUp } from 'package-up';
 import prompts from 'prompts';
 import { candidates, SUPPORTED, transform, UNSUPPORTED, type Frameworks } from './index';
-import { parseManifestFromPackage, parsePackageJson } from './parser';
+import { findManifest } from './utils';
 
 const colorFramework = (framework: string) => {
     switch (framework) {
@@ -35,9 +34,10 @@ program
     .description(json.description)
     .version(json.version)
 
-    .argument('[input]', 'source directory')
-    .option('-f, --frameworks <frameworks...>', 'the framework to convert to')
+    .argument('[input]', 'custom elements manifest path')
+    .requiredOption('-e, --entrypoint <path>', 'entrypoint to the package')
     .requiredOption('-o, --outdir <outdir>', 'output directory')
+    .option('-f, --frameworks <frameworks...>', 'the framework to convert to')
     .option('-y, --yes', 'convert all candidates to all available frameworks')
 
     .action(
@@ -45,26 +45,20 @@ program
             sourceDir,
             options: {
                 outdir: string;
-                entrypoint?: string;
+                entrypoint: string;
                 frameworks?: Frameworks[];
                 yes?: boolean;
             }
         ) => {
             sourceDir = sourceDir ? resolve(sourceDir) : process.cwd();
 
-            const input = await packageUp({ cwd: sourceDir });
-            if (!input) {
-                throw new Error('No package.json found');
-            }
-
-            const json = await parsePackageJson(input);
-            const manifest = await parseManifestFromPackage(input, json);
+            const manifest = await findManifest(sourceDir);
             if (!manifest) {
                 throw new Error('No custom elements manifest found');
             }
 
             const yes = options.yes || !process.stdout.isTTY;
-            const data = Array.from(candidates(json, manifest));
+            const data = Array.from(candidates(manifest));
             if (data.length === 0) {
                 throw new Error('No components found');
             }
@@ -135,6 +129,7 @@ program
 
                                     const outDir = options.outdir.replace(/\[framework\]/g, framework);
                                     const outFile = await transform(entry, framework, {
+                                        entrypoint: options.entrypoint,
                                         outdir: outDir,
                                     });
                                     task.title = `Converted ${chalk.whiteBright(component)} to ${colorFramework(
diff --git a/src/parser.ts b/src/parser.ts
deleted file mode 100644
index 8386d69..0000000
--- a/src/parser.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import { readFile } from 'node:fs/promises';
-import { dirname, resolve } from 'node:path';
-import type { Package } from 'custom-elements-manifest';
-import type { PackageJson as PackageJsonBase } from 'type-fest';
-
-export type PackageJson = PackageJsonBase & {
-    customElements?: string;
-};
-
-export async function parseJson(fileName: string) {
-    const contents = await readFile(fileName, 'utf-8');
-    const json = JSON.parse(contents);
-
-    return json;
-}
-
-export async function parsePackageJson(fileName: string) {
-    return JSON.parse(await readFile(fileName, 'utf-8')) as PackageJson;
-}
-
-export async function parseManifestFromPackage(fileName: string, data: PackageJson) {
-    if (!data.customElements) {
-        return null;
-    }
-
-    return parseJson(resolve(dirname(fileName), data.customElements)) as Promise<Package>;
-}
diff --git a/src/preact.ts b/src/preact.ts
index 5288958..d4ca022 100644
--- a/src/preact.ts
+++ b/src/preact.ts
@@ -4,14 +4,19 @@ import { capitalize, filterPublicMemebers } from './utils';
 import type { Entry } from './walker';
 
 export interface PreactTransformOptions {
+    /**
+     * The entrypoint to the package.
+     */
+    entrypoint: string;
+
     /**
      * The output directory to write the converted components to.
      */
     outdir: string;
 }
 
-export function generatePreactComponent(entry: Entry) {
-    const { packageJson, definition, declaration } = entry;
+export function generatePreactComponent(entry: Entry, options: PreactTransformOptions) {
+    const { definition, declaration } = entry;
 
     const props = filterPublicMemebers(declaration).map((member) => member.name);
     const eventProps =
@@ -25,7 +30,7 @@ export function generatePreactComponent(entry: Entry) {
 
     return `import { h } from 'preact';
 import { useRef, useEffect } from 'preact/hooks';
-import '${packageJson.name}';
+import '${options.entrypoint}';
 
 const properties = ${JSON.stringify(props)};
 const events = ${JSON.stringify(eventProps)};
@@ -62,11 +67,11 @@ export const ${declaration.name} = ({ children, ...props }) => {
 };`;
 }
 
-export function generatePreactTypings(entry: Entry) {
-    const { packageJson, declaration } = entry;
+export function generatePreactTypings(entry: Entry, options: PreactTransformOptions) {
+    const { declaration } = entry;
 
     const imports = `import { FunctionComponent, JSX } from 'preact';
-import { ${declaration.name} as Base${declaration.name} } from '${packageJson.name}';
+import { ${declaration.name} as Base${declaration.name} } from '${options.entrypoint}';
 `;
 
     const propertiesTypings = filterPublicMemebers(declaration).map(
@@ -95,8 +100,8 @@ export async function transformPreact(entry: Entry, options: PreactTransformOpti
         recursive: true,
     });
     await Promise.all([
-        writeFile(outFile, generatePreactComponent(entry)),
-        writeFile(declFile, generatePreactTypings(entry)),
+        writeFile(outFile, generatePreactComponent(entry, options)),
+        writeFile(declFile, generatePreactTypings(entry, options)),
     ]);
 
     return outFile;
diff --git a/src/react.ts b/src/react.ts
index d84cd93..263b4a8 100644
--- a/src/react.ts
+++ b/src/react.ts
@@ -4,6 +4,11 @@ import { capitalize, filterPublicMemebers } from './utils';
 import type { Entry } from './walker';
 
 export interface ReactTransformOptions {
+    /**
+     * The entrypoint to the package.
+     */
+    entrypoint: string;
+
     /**
      * The output directory to write the converted components to.
      */
@@ -163,8 +168,8 @@ function getAttributes(tagName: string) {
     }
 }
 
-export function generateReactComponent(entry: Entry) {
-    const { packageJson, definition, declaration } = entry;
+export function generateReactComponent(entry: Entry, options: ReactTransformOptions) {
+    const { definition, declaration } = entry;
 
     const props = filterPublicMemebers(declaration).map((member) => member.name);
     const eventProps =
@@ -177,7 +182,7 @@ export function generateReactComponent(entry: Entry) {
         ) ?? {};
 
     return `import React, { useRef, useEffect } from 'react';
-import '${packageJson.name}';
+import '${options.entrypoint}';
 
 const properties = ${JSON.stringify(props)};
 const events = ${JSON.stringify(eventProps)};
@@ -214,11 +219,11 @@ export const ${declaration.name} = ({ children, ...props }) => {
 };`;
 }
 
-export function generateReactTypings(entry: Entry) {
-    const { packageJson, definition, declaration } = entry;
+export function generateReactTypings(entry: Entry, options: ReactTransformOptions) {
+    const { definition, declaration } = entry;
 
     const imports = `import React from 'react';
-import { ${declaration.name} as Base${declaration.name} } from '${packageJson.name}';
+import { ${declaration.name} as Base${declaration.name} } from '${options.entrypoint}';
 `;
 
     const propertiesTypings = filterPublicMemebers(declaration).map(
@@ -250,8 +255,8 @@ export async function transformReact(entry: Entry, options: ReactTransformOption
         recursive: true,
     });
     await Promise.all([
-        writeFile(outFile, generateReactComponent(entry)),
-        writeFile(declFile, generateReactTypings(entry)),
+        writeFile(outFile, generateReactComponent(entry, options)),
+        writeFile(declFile, generateReactTypings(entry, options)),
     ]);
 
     return outFile;
diff --git a/src/svelte.ts b/src/svelte.ts
index c4239ec..db0400a 100644
--- a/src/svelte.ts
+++ b/src/svelte.ts
@@ -4,6 +4,11 @@ import { filterPublicMemebers } from './utils';
 import type { Entry } from './walker';
 
 export interface SvelteTransformOptions {
+    /**
+     * The entrypoint to the package.
+     */
+    entrypoint: string;
+
     /**
      * The output directory to write the converted components to.
      */
@@ -163,8 +168,8 @@ function getAttributes(tagName: string) {
     }
 }
 
-export function generateSvelteComponent(entry: Entry) {
-    const { packageJson, definition, declaration } = entry;
+export function generateSvelteComponent(entry: Entry, options: SvelteTransformOptions) {
+    const { definition, declaration } = entry;
 
     const props: string[] = [];
     const setters: string[] = [];
@@ -196,7 +201,7 @@ export function generateSvelteComponent(entry: Entry) {
 
     return `<script>
     import { onMount, bubble, listen, get_current_component } from 'svelte/internal';
-    import '${packageJson.name}';
+    import '${options.entrypoint}';
 
     let __ref;
     let __mounted = false;
@@ -245,10 +250,10 @@ export function generateSvelteComponent(entry: Entry) {
 ${markup}`;
 }
 
-export function generateSvelteTypings(entry: Entry) {
-    const { packageJson, definition, declaration } = entry;
+export function generateSvelteTypings(entry: Entry, options: SvelteTransformOptions) {
+    const { definition, declaration } = entry;
     const imports = `import { SvelteComponent } from 'svelte';
-import { ${declaration.name} as Base${declaration.name} } from '${packageJson.name}';
+import { ${declaration.name} as Base${declaration.name} } from '${options.entrypoint}';
 import { ${getAttributes(definition.extend ?? definition.name).split('<')[0]} } from 'svelte/elements';
 `;
 
@@ -310,8 +315,8 @@ export async function transformSvelte(entry: Entry, options: SvelteTransformOpti
             outFile,
             `import ${declaration.name} from './${declaration.name}.svelte';\n\nexport { ${declaration.name} };`
         ),
-        writeFile(svelteFile, generateSvelteComponent(entry)),
-        writeFile(declFile, generateSvelteTypings(entry)),
+        writeFile(svelteFile, generateSvelteComponent(entry, options)),
+        writeFile(declFile, generateSvelteTypings(entry, options)),
     ]);
 
     return outFile;
diff --git a/src/utils.ts b/src/utils.ts
index 5091708..13875b4 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,4 +1,6 @@
-import type { ClassField, CustomElementDeclaration } from 'custom-elements-manifest';
+import { access, readFile } from 'node:fs/promises';
+import { dirname, extname, join } from 'node:path';
+import type { ClassField, CustomElementDeclaration, Package } from 'custom-elements-manifest';
 
 export function capitalize(str: string) {
     return str.charAt(0).toUpperCase() + str.slice(1);
@@ -28,3 +30,30 @@ export function isOptionalClassField(member: ClassField) {
             .includes('undefined') ?? true
     );
 }
+
+export async function parseJson(fileName: string) {
+    const contents = await readFile(fileName, 'utf-8');
+    const json = JSON.parse(contents);
+
+    return json;
+}
+
+export async function findManifest(from: string, name = 'custom-elements.json') {
+    if (extname(from) === '.json') {
+        return parseJson(from) as Promise<Package>;
+    }
+
+    const packageJsonFile = join(from, name);
+    try {
+        await access(packageJsonFile);
+
+        return parseJson(packageJsonFile) as Promise<Package>;
+    } catch {
+        const dir = dirname(from);
+        if (dir === from) {
+            throw new Error(`No ${name} found`);
+        }
+
+        return findManifest(dir, name);
+    }
+}
diff --git a/src/walker.ts b/src/walker.ts
index 2e34d04..faea0a4 100644
--- a/src/walker.ts
+++ b/src/walker.ts
@@ -5,10 +5,8 @@ import type {
     JavaScriptModule,
     Package,
 } from 'custom-elements-manifest';
-import type { PackageJson } from './parser';
 
 export interface Entry {
-    packageJson: PackageJson;
     manifest: Package;
     module: JavaScriptModule;
     definition: CustomElementExport & { extend?: string };
@@ -19,7 +17,7 @@ function isCustomElementDeclaration(declaration: Declaration): declaration is Cu
     return declaration.kind === 'class' && 'customElement' in declaration;
 }
 
-export function* candidates(packageJson: PackageJson, manifest: Package): Generator<Entry> {
+export function* candidates(manifest: Package): Generator<Entry> {
     for (const module of manifest.modules) {
         if (module.exports) {
             for (const export_ of module.exports) {
@@ -34,7 +32,7 @@ export function* candidates(packageJson: PackageJson, manifest: Package): Genera
                         if (declaration.tagName !== export_.name) {
                             continue;
                         }
-                        yield { packageJson, manifest, module, definition: export_, declaration };
+                        yield { manifest, module, definition: export_, declaration };
                     }
                 }
             }