diff --git a/packages/uniconfig-core/src/config.js b/packages/uniconfig-core/src/config.js
index 98213308..d4298e4d 100644
--- a/packages/uniconfig-core/src/config.js
+++ b/packages/uniconfig-core/src/config.js
@@ -105,7 +105,7 @@ export default class Config {
   evaluate () {
     const data = this.data = {}
     each(this.input.data, (value, key)=> {
-      if (/^\$.+:.+/.test(value)) {
+      if (/^\$.+:.*/.test(value)) {
         const [sourceName, path] = value.slice(1).split(':')
         const source = this.context.source.get(sourceName)
 
diff --git a/packages/uniconfig-core/src/interface.js b/packages/uniconfig-core/src/interface.js
index d317c187..7cd64cc4 100644
--- a/packages/uniconfig-core/src/interface.js
+++ b/packages/uniconfig-core/src/interface.js
@@ -102,7 +102,7 @@ export interface ISource {
   on(event: string, listener: IEventListener): ISource,
   emit(event: string, data?: IAny): boolean,
 
-  get(path: string): IAny,
+  get(path?: string): IAny,
   has(path: string): boolean,
 }
 
diff --git a/packages/uniconfig-core/src/source/source.js b/packages/uniconfig-core/src/source/source.js
index ffca06d9..868abcdb 100644
--- a/packages/uniconfig-core/src/source/source.js
+++ b/packages/uniconfig-core/src/source/source.js
@@ -97,10 +97,12 @@ export default class Source implements ISource {
     return this
   }
 
-  get (path: string): IAny {
+  get (path?: string): IAny {
     this.constructor.assertReady(this)
 
-    return get(this.data, path)
+    return path
+      ? get(this.data, path)
+      : this.data
   }
 
   has (path: string): boolean {
diff --git a/packages/uniconfig-plugin-api-file/.babelrc b/packages/uniconfig-plugin-api-file/.babelrc
new file mode 100644
index 00000000..33a624a3
--- /dev/null
+++ b/packages/uniconfig-plugin-api-file/.babelrc
@@ -0,0 +1,35 @@
+{
+  "comments": false,
+  "ignore": [
+    "interface.js"
+  ],
+  "presets": [
+    "@babel/preset-flow"
+  ],
+  "env": {
+    "production": {
+      "presets": [
+        "@babel/preset-flow",
+        ["@babel/preset-env", {
+          "modules": false
+        }]
+      ],
+      "plugins": [
+        "@babel/plugin-transform-modules-commonjs",
+        "@babel/plugin-proposal-class-properties",
+        "@babel/plugin-proposal-object-rest-spread"
+      ]
+    },
+    "test": {
+      "presets": [
+        "@babel/preset-flow",
+        "@babel/preset-env"
+      ],
+      "plugins": [
+        "@babel/plugin-transform-modules-commonjs",
+        "@babel/plugin-proposal-class-properties",
+        "@babel/plugin-proposal-object-rest-spread"
+      ]
+    }
+  }
+}
diff --git a/packages/uniconfig-plugin-api-file/README.md b/packages/uniconfig-plugin-api-file/README.md
new file mode 100644
index 00000000..81865667
--- /dev/null
+++ b/packages/uniconfig-plugin-api-file/README.md
@@ -0,0 +1,44 @@
+# @qiwi/uniconfig-plugin-api-file
+
+Uniconfig File API plugin
+
+## Install
+```bash
+  npm i @qiwi/uniconfig-plugin-api-file
+  yarn add @qiwi/uniconfig-plugin-api-fil
+```
+
+
+## Usage
+```javascript
+import uniconfig, {rollupPlugin} from '@qiwi/uniconfig-core'
+import uniconfigFileApiPlugin from '@qiwi/uniconfig-plugin-api-file'
+import uniconfigJsonParserPlugin from '@qiwi/uniconfig-plugin-parser-json'
+    
+rollupPlugin(uniconfigFileApiPlugin)
+rollupPlugin(uniconfigJsonParserPlugin)
+
+const target = './foo.json'
+/** foo.json content:
+{
+  "foo": "bar"
+}
+*/
+
+const config = uniconfig({
+  data: {
+    someParam: '$fromFile:foo'
+  },
+  source: {
+    fromFile: {
+      target,
+      api: 'file',
+      parser: 'json'
+    }
+  }
+}, {
+  mode: 'sync'
+})    
+
+config.get('someParam') // "bar"
+```
diff --git a/packages/uniconfig-plugin-api-file/package.json b/packages/uniconfig-plugin-api-file/package.json
new file mode 100644
index 00000000..29f97958
--- /dev/null
+++ b/packages/uniconfig-plugin-api-file/package.json
@@ -0,0 +1,38 @@
+{
+  "name": "@qiwi/uniconfig-plugin-api-file",
+  "version": "1.16.0",
+  "description": "Uniconfig file api (fs api) plugin",
+  "main": "dist/es6/index.js",
+  "scripts": {
+    "jest": "BABEL_ENV=test NODE_ENV=test jest -w 1 --detectOpenHandles --config jest.config.json",
+    "build_es6": "flow-remove-types src/ --out-dir dist/es6/",
+    "build_es5": "BABEL_ENV=production babel src --out-dir dist/es5/",
+    "build_bundle": "parcel build dist/es6/index.js --out-dir dist/bundle --experimental-scope-hoisting",
+    "build": "rm -rf dist && npm run build_es6 && npm run build_es5 && npm run build_bundle"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/qiwi/uniconfig.git"
+  },
+  "keywords": [
+    "universal config",
+    "unified config"
+  ],
+  "author": "Qiwi <opensource@qiwi.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/qiwi/uniconfig/issues"
+  },
+  "homepage": "https://github.com/qiwi/uniconfig#readme",
+  "dependencies": {
+    "@qiwi/uniconfig-core": "^1.0.0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.1.2"
+  },
+  "files": [
+    "README.md",
+    "CHANGELOG.md",
+    "dist/"
+  ]
+}
diff --git a/packages/uniconfig-plugin-api-file/src/index.js b/packages/uniconfig-plugin-api-file/src/index.js
new file mode 100644
index 00000000..18e7f0bb
--- /dev/null
+++ b/packages/uniconfig-plugin-api-file/src/index.js
@@ -0,0 +1,48 @@
+// @flow
+
+import type {IApi, IAny, IResolve, IReject, IContext, IPlugin} from '../../uniconfig-core/src/interface'
+export type IFsOpts = {
+  encoding: string,
+  flag?: string
+}
+
+export interface IFileApi extends IApi {
+  readSync (target: string, opts?: ?IFsOpts): IAny,
+  read (target: string, opts?: ?IFsOpts): Promise<IAny>
+}
+
+export const DEFAULT_OPTS: IFsOpts = {
+  encoding: 'utf8'
+}
+
+export const type = 'file'
+
+export const api: IFileApi = {
+  readSync (target: string, opts?: ?IFsOpts): IAny {
+    return require('fs').readFileSync(target, processOpts(opts))
+  },
+  read (target: string, opts?: ?IFsOpts): Promise<IAny> {
+    return new Promise((resolve: IResolve, reject: IReject): void => {
+      require('fs').readFile(target, processOpts(opts), (err: IAny | null, data: IAny) => {
+        if (err) {
+          reject(err)
+        } else {
+          resolve(data)
+        }
+      })
+    })
+  }
+}
+
+export default ({
+  rollup(context: IContext): void {
+    context.api.add(type, api)
+  },
+  rollback(context: IContext): void {
+    context.api.remove(type)
+  },
+}: IPlugin)
+
+export function processOpts (opts?: ?IFsOpts): IFsOpts {
+  return { ...DEFAULT_OPTS, ...opts }
+}
diff --git a/packages/uniconfig-plugin-api-file/test/foobar.json b/packages/uniconfig-plugin-api-file/test/foobar.json
new file mode 100644
index 00000000..9f5dd4e3
--- /dev/null
+++ b/packages/uniconfig-plugin-api-file/test/foobar.json
@@ -0,0 +1 @@
+{"foo":"bar"}
\ No newline at end of file
diff --git a/packages/uniconfig-plugin-api-file/test/index.js b/packages/uniconfig-plugin-api-file/test/index.js
new file mode 100644
index 00000000..f52b6f86
--- /dev/null
+++ b/packages/uniconfig-plugin-api-file/test/index.js
@@ -0,0 +1,71 @@
+import plugin, {api} from '../src'
+import path from 'path'
+import {ASYNC, SYNC} from '@qiwi/uniconfig-core/src/source/source'
+import {Config, rollupPlugin, rollbackPlugin} from '@qiwi/uniconfig-core/src'
+
+describe('uniconfig-plugin-api-file', () => {
+  const target = path.resolve(__dirname, './foobar.json')
+
+  describe('#readSync', () => {
+    it('gets file data as string', () => {
+      expect(api.readSync(target)).toEqual(JSON.stringify({ foo: 'bar' }))
+    })
+
+    it('gets err as result', () => {
+      expect(() => api.readSync('bazqux')).toThrow('ENOENT: no such file or directory, open \'bazqux\'')
+    })
+  })
+
+  describe('#read', () => {
+    it('resolves promise with string', () => {
+      return expect(api.read(target)).resolves.toEqual(JSON.stringify({ foo: 'bar' }))
+    })
+
+    it('rejects promise with err', () => {
+      return expect(api.read('bazqux')).rejects.toThrow('ENOENT: no such file or directory, open \'bazqux\'')
+    })
+  })
+
+  describe('integration', () => {
+    beforeAll(() => {
+      rollupPlugin(plugin)
+    })
+
+    afterAll(() => {
+      rollbackPlugin(plugin)
+    })
+
+    const input = {
+      data: {
+        someParam: '$fromFile:'
+      },
+      source: {
+        fromFile: {
+          target,
+          api: 'file'
+        }
+      }
+    }
+
+    it('sync', () => {
+      const mode = SYNC
+      const opts = {mode}
+      const config = new Config(input, opts)
+
+      expect(config.context.source.get('fromFile').get()).toBe('{"foo":"bar"}')
+      expect(config.get('someParam')).toBe('{"foo":"bar"}')
+    })
+
+    it('async', done => {
+      const mode = ASYNC
+      const opts = {mode}
+      const config = new Config(input, opts)
+
+      config.on('CONFIG_READY', () => {
+        expect(config.context.source.get('fromFile').get()).toBe('{"foo":"bar"}')
+        expect(config.get('someParam')).toBe('{"foo":"bar"}')
+        done()
+      })
+    })
+  })
+})
\ No newline at end of file
diff --git a/packages/uniconfig-plugin-json/src/index.js b/packages/uniconfig-plugin-json/src/index.js
index 6fbda432..61ebfc76 100644
--- a/packages/uniconfig-plugin-json/src/index.js
+++ b/packages/uniconfig-plugin-json/src/index.js
@@ -2,11 +2,11 @@
 
 import type {IContext, IPlugin, IAny, IParser, IParse} from '../../uniconfig-core/src/interface'
 
-const type = 'json'
+export const type = 'json'
 
 export const parse: IParse = (data: string): IAny => JSON.parse(data)
 
-const parser: IParser = {parse}
+export const parser: IParser = {parse}
 
 export default ({
   rollup(context: IContext): void {