added flux JSON package, resolves #393

content/v2.0/reference/flux/functions/json/_index.md

@@ -0,0 +1,22 @@
+---
+title: Flux JSON package
+list_title: JSON package
+description: >
+  The Flux JSON package provides functions for working with JSON.
+  Import the `json` package.
+menu:
+  v2_0_ref:
+    name: JSON
+    parent: Flux packages and functions
+weight: 202
+v2.0/tags: [functions, json, package]
+---
+
+JSON Flux functions provide tools for working with JSON.
+Import the `json` package:
+
+```js
+import "json"
+```
+
+{{< children type="functions" show="pages" >}}

content/v2.0/reference/flux/functions/json/encode.md

@@ -0,0 +1,47 @@
+---
+title: json.encode() function
+description: The `json.encode()` function converts a value into JSON bytes
+menu:
+  v2_0_ref:
+    name: json.encode
+    parent: JSON
+weight: 202
+---
+
+The `json.encode()` function converts a value into JSON bytes.
+
+_**Function type:** Type conversion_
+
+```js
+import "json"
+
+json.encode(v: "some value")
+```
+
+The function encodes [Flux types](/v2.0/reference/flux/language/types/) in the following manner:
+
+- It encodes `time` values using [RFC3339](https://tools.ietf.org/html/rfc3339).
+- It encodes `duration` values in number of milliseconds since the epoch.
+- It encodes `regexp` values as their string representation.
+- It encodes `bytes` values as base64-encoded strings.
+- It cannot encode `function` values and will produce an error.
+
+## Parameters
+
+### v
+The value to convert.
+
+_**Data type:** Boolean | Duration | Float | Integer | String | Time | UInteger_
+
+## Examples
+
+### Encode all values in a column in JSON bytes
+```js
+import "json"
+
+from(bucket: "example-bucket")
+  |> range(start: -1h)
+  |> map(fn: (r) => ({
+      r with _value: json.encode(v: r._value)
+  }))
+```