diff --git a/README.md b/README.md
index 8caf49d81..f69634fd4 100644
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ hems:
 
 to the configuration. The EVCC loadpoints can then be added to the SHM configuration. When SHM is used, the ratio of Grid to PV Power for the **Min+PV** mode can be adjusted in
 Sunny-Portal via the "Optional energy demand" slider. When the amount of configured PV is not available, charging suspends like in **PV** mode. So, pushing the slider completely
-to the left makes **Min+PV** behave as described above. Pushing completely to the right makes **Min+PV** mode behave like **PV** mode. 
+to the left makes **Min+PV** behave as described above. Pushing completely to the right makes **Min+PV** mode behave like **PV** mode.
 
 ## Plugins
 
@@ -265,9 +265,20 @@ add:
 
 The `calc` plugin is useful e.g. to combine power values if import and export power are separate like with S0 meters. Use `scale` on one of the elements to implement a subtraction.
 
+### Javascript (read only)
+
+The `js` plugin is able to execute Javascript code from the `script` tag. Useful for quick prototyping:
+
+```yaml
+type: js
+script: |
+  var res = 500;
+  2 * res; // returns 1000
+```
+
 ### Modbus (read only)
 
-The `modbus` plugins is able to read data from any Modbus meter or SunSpec-compatible solar inverter. Many meters are already pre-configured (see [MBMD Supported Devices](https://github.com/volkszaehler/mbmd#supported-devices)).
+The `modbus` plugin is able to read data from any Modbus meter or SunSpec-compatible solar inverter. Many meters are already pre-configured (see [MBMD Supported Devices](https://github.com/volkszaehler/mbmd#supported-devices)).
 
 The meter configuration consists of the actual physical connection and the value to be read.
 
diff --git a/go.mod b/go.mod
index 16287c561..dd3965805 100644
--- a/go.mod
+++ b/go.mod
@@ -43,6 +43,7 @@ require (
 	github.com/mxschmitt/golang-combinations v1.1.0
 	github.com/nirasan/go-oauth-pkce-code-verifier v0.0.0-20170819232839-0fbfe93532da
 	github.com/olekukonko/tablewriter v0.0.4
+	github.com/robertkrimen/otto v0.0.0-20200922221731-ef014fd054ac
 	github.com/spf13/cobra v1.1.1
 	github.com/spf13/jwalterweatherman v1.1.0
 	github.com/spf13/pflag v1.0.5
@@ -53,6 +54,7 @@ require (
 	github.com/volkszaehler/mbmd v0.0.0-20201205173745-5106cb0b334e
 	golang.org/x/net v0.0.0-20200904194848-62affa334b73
 	gopkg.in/ini.v1 v1.62.0
+	gopkg.in/sourcemap.v1 v1.0.5 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
 )
 
diff --git a/go.sum b/go.sum
index 00c7201dd..5c77e93b8 100644
--- a/go.sum
+++ b/go.sum
@@ -244,6 +244,8 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/robertkrimen/otto v0.0.0-20200922221731-ef014fd054ac h1:kYPjbEN6YPYWWHI6ky1J813KzIq/8+Wg4TO4xU7A/KU=
+github.com/robertkrimen/otto v0.0.0-20200922221731-ef014fd054ac/go.mod h1:xvqspoSXJTIpemEonrMDFq6XzwHYYgToXWj5eRX1OtY=
 github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
@@ -412,6 +414,8 @@ gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
 gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
 gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/sourcemap.v1 v1.0.5 h1:inv58fC9f9J3TK2Y2R1NPntXEn3/wjWHkonhIUODNTI=
+gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb78=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/provider/config.go b/provider/config.go
index 7329d9cd0..d7fbc5739 100644
--- a/provider/config.go
+++ b/provider/config.go
@@ -72,6 +72,11 @@ func NewFloatGetterFromConfig(config Config) (res func() (float64, error), err e
 		if prov, err = NewHTTPProviderFromConfig(config.Other); err == nil {
 			res = prov.FloatGetter
 		}
+	case "js":
+		var prov *Javascript
+		if prov, err = NewJavascriptProviderFromConfig(config.Other); err == nil {
+			res = prov.FloatGetter
+		}
 	case "websocket", "ws":
 		var prov *Socket
 		if prov, err = NewSocketProviderFromConfig(config.Other); err == nil {
@@ -115,6 +120,11 @@ func NewIntGetterFromConfig(config Config) (res func() (int64, error), err error
 		if prov, err = NewHTTPProviderFromConfig(config.Other); err == nil {
 			res = prov.IntGetter
 		}
+	case "js":
+		var prov *Javascript
+		if prov, err = NewJavascriptProviderFromConfig(config.Other); err == nil {
+			res = prov.IntGetter
+		}
 	case "websocket", "ws":
 		var prov *Socket
 		if prov, err = NewSocketProviderFromConfig(config.Other); err == nil {
@@ -159,6 +169,11 @@ func NewStringGetterFromConfig(config Config) (res func() (string, error), err e
 		if prov, err = NewHTTPProviderFromConfig(config.Other); err == nil {
 			res = prov.StringGetter
 		}
+	case "js":
+		var prov *Javascript
+		if prov, err = NewJavascriptProviderFromConfig(config.Other); err == nil {
+			res = prov.StringGetter
+		}
 	case "websocket", "ws":
 		var prov *Socket
 		if prov, err = NewSocketProviderFromConfig(config.Other); err == nil {
@@ -200,6 +215,11 @@ func NewBoolGetterFromConfig(config Config) (res func() (bool, error), err error
 		if prov, err = NewHTTPProviderFromConfig(config.Other); err == nil {
 			res = prov.BoolGetter
 		}
+	case "js":
+		var prov *Javascript
+		if prov, err = NewJavascriptProviderFromConfig(config.Other); err == nil {
+			res = prov.BoolGetter
+		}
 	case "websocket", "ws":
 		var prov *Socket
 		if prov, err = NewSocketProviderFromConfig(config.Other); err == nil {
diff --git a/provider/http.go b/provider/http.go
index 07fc36a2f..173138174 100644
--- a/provider/http.go
+++ b/provider/http.go
@@ -51,7 +51,9 @@ func NewHTTPProviderFromConfig(other map[string]interface{}) (*HTTP, error) {
 		Scale       float64
 		Insecure    bool
 		Auth        Auth
-	}{Headers: make(map[string]string)}
+	}{
+		Headers: make(map[string]string),
+	}
 
 	if err := util.DecodeOther(other, &cc); err != nil {
 		return nil, err
diff --git a/provider/javascript.go b/provider/javascript.go
new file mode 100644
index 000000000..4f61242ea
--- /dev/null
+++ b/provider/javascript.go
@@ -0,0 +1,95 @@
+package provider
+
+import (
+	"github.com/andig/evcc/util"
+	"github.com/robertkrimen/otto"
+)
+
+// Javascript implements Javascript request provider
+type Javascript struct {
+	log    *util.Logger
+	vm     *otto.Otto
+	script string
+}
+
+// NewJavascriptProviderFromConfig creates a HTTP provider
+func NewJavascriptProviderFromConfig(other map[string]interface{}) (*Javascript, error) {
+	cc := struct {
+		Script string
+	}{}
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	log := util.NewLogger("js")
+
+	p := &Javascript{
+		log:    log,
+		vm:     otto.New(),
+		script: cc.Script,
+	}
+
+	return p, nil
+}
+
+// FloatGetter parses float from request
+func (p *Javascript) FloatGetter() (res float64, err error) {
+	v, err := p.vm.Eval(p.script)
+	if err == nil {
+		res, err = v.ToFloat()
+	}
+
+	return res, err
+}
+
+// IntGetter parses int64 from request
+func (p *Javascript) IntGetter() (res int64, err error) {
+	v, err := p.vm.Eval(p.script)
+	if err == nil {
+		res, err = v.ToInteger()
+	}
+
+	return res, err
+}
+
+// StringGetter sends string request
+func (p *Javascript) StringGetter() (res string, err error) {
+	v, err := p.vm.Eval(p.script)
+	if err == nil {
+		res, err = v.ToString()
+	}
+
+	return res, err
+}
+
+// BoolGetter parses bool from request
+func (p *Javascript) BoolGetter() (res bool, err error) {
+	v, err := p.vm.Eval(p.script)
+	if err == nil {
+		res, err = v.ToBoolean()
+	}
+
+	return res, err
+}
+
+// // IntSetter sends int request
+// func (p *Javascript) IntSetter(param int64) error {
+// 	body := util.FormatValue(p.body, param)
+// 	_, err := p.request(body)
+// 	return err
+// }
+
+// // StringSetter sends string request
+// func (p *Javascript) StringSetter(param string) error {
+// 	body := util.FormatValue(p.body, param)
+// 	_, err := p.request(body)
+// 	return err
+// }
+
+// // BoolSetter sends bool request
+// func (p *Javascript) BoolSetter(param bool) error {
+// 	body := util.FormatValue(p.body, param)
+// 	_, err := p.request(body)
+// 	return err
+// }