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<!doctype html>
<html>
<head>
<link rel="stylesheet" href="../api_static/tomorrow-night.css">
<link rel="stylesheet" href="../api_static/style.css" type="text/css">
<script src="../api_static//highlight.pack.js"></script>
<script src="../api_static//script.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
<meta charset="utf8">
<link rel="previous" href="Js_int64.html"><link rel="next" href="Js_list.html">
<title> Js_json </title></head>
<body>
<nav class="module-index"><ul><li><a href="Bs.html">Bs</a></li>
<li><a href="Bs_dyn.html">Bs_dyn</a></li>
<li><a href="Bs_dyn_lib.html">Bs_dyn_lib</a></li>
<li><a href="Dom.html">Dom</a></li>
<li><a href="Js.html">Js</a></li>
<li><a href="Js_array.html">Js_array</a></li>
<li><a href="Js_boolean.html">Js_boolean</a></li>
<li><a href="Js_cast.html">Js_cast</a></li>
<li><a href="Js_date.html">Js_date</a></li>
<li><a href="Js_dict.html">Js_dict</a></li>
<li><a href="Js_exn.html">Js_exn</a></li>
<li><a href="Js_float.html">Js_float</a></li>
<li><a href="Js_global.html">Js_global</a></li>
<li><a href="Js_int.html">Js_int</a></li>
<li><a href="Js_int64.html">Js_int64</a></li>
<li><a href="Js_json.html">Js_json</a></li>
<li><a href="Js_list.html">Js_list</a></li>
<li><a href="Js_math.html">Js_math</a></li>
<li><a href="Js_nativeint.html">Js_nativeint</a></li>
<li><a href="Js_null.html">Js_null</a></li>
<li><a href="Js_null_undefined.html">Js_null_undefined</a></li>
<li><a href="Js_obj.html">Js_obj</a></li>
<li><a href="Js_option.html">Js_option</a></li>
<li><a href="Js_primitive.html">Js_primitive</a></li>
<li><a href="Js_promise.html">Js_promise</a></li>
<li><a href="Js_re.html">Js_re</a></li>
<li><a href="Js_result.html">Js_result</a></li>
<li><a href="Js_string.html">Js_string</a></li>
<li><a href="Js_typed_array.html">Js_typed_array</a></li>
<li><a href="Js_types.html">Js_types</a></li>
<li><a href="Js_undefined.html">Js_undefined</a></li>
<li><a href="Js_unsafe.html">Js_unsafe</a></li>
<li><a href="Js_vector.html">Js_vector</a></li>
<li><a href="Node.html">Node</a></li>
<li><a href="Node_buffer.html">Node_buffer</a></li>
<li><a href="Node_child_process.html">Node_child_process</a></li>
<li><a href="Node_fs.html">Node_fs</a></li>
<li><a href="Node_module.html">Node_module</a></li>
<li><a href="Node_path.html">Node_path</a></li>
<li><a href="Node_process.html">Node_process</a></li></ul></nav>
<div class="navbar"><a class="pre" href="Js_int64.html" title="Js_int64">Previous</a>
<a class="up" href="index.html" title="Index">Up</a>
<a class="post" href="Js_list.html" title="Js_list">Next</a>
</div>
<h1>Module <a href="type_Js_json.html">Js_json</a></h1>
<pre><span class="keyword">module</span> Js_json: <code class="code">sig</code> <a href="Js_json.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="not-examples">
Efficient JSON encoding using JavaScript API<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON">MDN</a><br>
</div>
</div>
</div>
<hr width="100%">
<div class="type-declaration">
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
</div>
<div class="info ">
<div class="not-examples">
The JSON data structure<br>
</div>
</div>
<div class="type-declaration">
<pre><code><span id="TYPEkind"><span class="keyword">type</span> <code class="type">'_</code> kind</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkind.String"><span class="constructor">String</span></span></td><td><span class="keyword">:</span></td><td><code class="type"><a href="Js_string.html#TYPEt">Js_string.t</a> <a href="Js_json.html#TYPEkind">kind</a></code></code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkind.Number"><span class="constructor">Number</span></span></td><td><span class="keyword">:</span></td><td><code class="type">float <a href="Js_json.html#TYPEkind">kind</a></code></code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkind.Object"><span class="constructor">Object</span></span></td><td><span class="keyword">:</span></td><td><code class="type"><a href="Js_json.html#TYPEt">t</a> <a href="Js_dict.html#TYPEt">Js_dict.t</a> <a href="Js_json.html#TYPEkind">kind</a></code></code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkind.Array"><span class="constructor">Array</span></span></td><td><span class="keyword">:</span></td><td><code class="type"><a href="Js_json.html#TYPEt">t</a> array <a href="Js_json.html#TYPEkind">kind</a></code></code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkind.Boolean"><span class="constructor">Boolean</span></span></td><td><span class="keyword">:</span></td><td><code class="type"><a href="Js.html#TYPEboolean">Js.boolean</a> <a href="Js_json.html#TYPEkind">kind</a></code></code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkind.Null"><span class="constructor">Null</span></span></td><td><span class="keyword">:</span></td><td><code class="type"><a href="Js_types.html#TYPEnull_val">Js_types.null_val</a> <a href="Js_json.html#TYPEkind">kind</a></code></code></td>
</tr></table>
</div>
<div class="info ">
<div class="not-examples">
Underlying type of a JSON value<br>
</div>
</div>
<pre><span id="VALreifyType"><span class="keyword">val</span> reifyType</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> 'b <a href="Js_json.html#TYPEkind">kind</a> * 'b</code></pre><div class="info ">
<div class="not-examples">
<code class="code">reifyType v</code> returns both type and underlying value<br>
</div>
</div>
<pre><span id="VALtest"><span class="keyword">val</span> test</span> : <code class="type">'a -> 'b <a href="Js_json.html#TYPEkind">kind</a> -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">test v kind</code> returns true if <code class="code">v</code> is of <code class="code">kind</code><br>
</div>
</div>
<pre><span id="VALdecodeString"><span class="keyword">val</span> decodeString</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> <a href="Js_string.html#TYPEt">Js_string.t</a> option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">decodeString json</code> returns <code class="code">Some s</code> if <code class="code">json</code> is a string, <code class="code">None</code>
otherwise<br>
</div>
</div>
<pre><span id="VALdecodeNumber"><span class="keyword">val</span> decodeNumber</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> float option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">decodeNumber json</code> returns <code class="code">Some n</code> if <code class="code">json</code> is a number, <code class="code">None</code>
otherwise<br>
</div>
</div>
<pre><span id="VALdecodeObject"><span class="keyword">val</span> decodeObject</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> <a href="Js_json.html#TYPEt">t</a> <a href="Js_dict.html#TYPEt">Js_dict.t</a> option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">decodeObject json</code> returns <code class="code">Some o</code> if <code class="code">json</code> is an object, <code class="code">None</code>
otherwise<br>
</div>
</div>
<pre><span id="VALdecodeArray"><span class="keyword">val</span> decodeArray</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> <a href="Js_json.html#TYPEt">t</a> array option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">decodeArray json</code> returns <code class="code">Some a</code> if <code class="code">json</code> is an array, <code class="code">None</code>
otherwise<br>
</div>
</div>
<pre><span id="VALdecodeBoolean"><span class="keyword">val</span> decodeBoolean</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> <a href="Js.html#TYPEboolean">Js.boolean</a> option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">decodeBoolean json</code> returns <code class="code">Some b</code> if <code class="code">json</code> is a boolean, <code class="code">None</code>
otherwise<br>
</div>
</div>
<pre><span id="VALdecodeNull"><span class="keyword">val</span> decodeNull</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> 'a <a href="Js_null.html#TYPEt">Js_null.t</a> option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">decodeNull json</code> returns <code class="code">Some null</code> if <code class="code">json</code> is a null, <code class="code">None</code>
otherwise<br>
</div>
</div>
<pre><span id="VALnull"><span class="keyword">val</span> null</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">null</code> is the singleton null JSON value<br>
</div>
</div>
<pre><span id="VALstring"><span class="keyword">val</span> string</span> : <code class="type">string -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">string s</code> makes a JSON string of the <code class="code">string</code> <code class="code">s</code><br>
</div>
</div>
<pre><span id="VALnumber"><span class="keyword">val</span> number</span> : <code class="type">float -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">number n</code> makes a JSON number of the <code class="code">float</code> <code class="code">n</code><br>
</div>
</div>
<pre><span id="VALboolean"><span class="keyword">val</span> boolean</span> : <code class="type"><a href="Js.html#TYPEboolean">Js.boolean</a> -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">boolean b</code> makes a JSON boolean of the <code class="code">Js.boolean</code> <code class="code">b</code><br>
</div>
</div>
<pre><span id="VALobject_"><span class="keyword">val</span> object_</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> <a href="Js_dict.html#TYPEt">Js_dict.t</a> -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">object_ dict</code> makes a JSON objet of the <code class="code">Js.Dict.t</code> <code class="code">dict</code><br>
</div>
</div>
<pre><span id="VALarray_"><span class="keyword">val</span> array_</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> array -> <a href="Js_json.html#TYPEt">t</a></code></pre>
<pre><span id="VALarray"><span class="keyword">val</span> array</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> array -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">array_ a</code> makes a JSON array of the <code class="code">Js.Json.t array</code> <code class="code">a</code><br>
</div>
</div>
<pre><span id="VALstringArray"><span class="keyword">val</span> stringArray</span> : <code class="type">string array -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">stringArray a</code> makes a JSON array of the <code class="code">string array</code> <code class="code">a</code><br>
</div>
</div>
<pre><span id="VALnumberArray"><span class="keyword">val</span> numberArray</span> : <code class="type">float array -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">numberArray a</code> makes a JSON array of the <code class="code">float array</code> <code class="code">a</code><br>
</div>
</div>
<pre><span id="VALbooleanArray"><span class="keyword">val</span> booleanArray</span> : <code class="type"><a href="Js.html#TYPEboolean">Js.boolean</a> array -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">booleanArray</code> makes a JSON array of the <code class="code">Js.boolean array</code> <code class="code">a</code><br>
</div>
</div>
<pre><span id="VALobjectArray"><span class="keyword">val</span> objectArray</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> <a href="Js_dict.html#TYPEt">Js_dict.t</a> array -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">objectArray a</code> makes a JSON array of the <code class="code">JsDict.t array</code> <code class="code">a</code><br>
</div>
</div>
<pre><span id="VALparse"><span class="keyword">val</span> parse</span> : <code class="type">string -> <a href="Js_json.html#TYPEt">t</a></code></pre>
<pre><span id="VALparseExn"><span class="keyword">val</span> parseExn</span> : <code class="type">string -> <a href="Js_json.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">parse s</code> parses the string <code class="code">s</code> into a JSON data structure
<p>
<b>Returns</b> a JSON data structure<br>
<div class="tag"> <b>Raises</b> <code>SyntaxError</code> if given string is not a valid JSON. Note <code class="code">SyntaxError</code> is a JavaScript exception.<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* parse a simple JSON string *)
let json =
try
Js_json.parse {| "foo" |}
with
| _ -> failwith "Error parsing JSON string"
in
match Js.Json.reifyType json in
| (Js.Json.String, value) -> Js.log value
| _ -> failWith "Expected a string"
</code></pre> </pre><pre class="example"> <pre class="codepre"><code class="code">(* parse a complex JSON string *)
let getIds s =
let json =
try
Js.Json.parse s
with
| _ -> failwith "Error parsing JSON string"
in
match Js.Json.reifyType json with
| (Js.Json.Object, value) ->
(* In this branch, compiler infer value : Js.Json.t Js.Dict.t *)
begin match Js.Dict.get value "ids" with
| Some ids ->
begin match Js.Json.reifyType ids with
| (Js.Json.Array, ids) ->
(* In this branch compiler infer ids : Js.Json.t array *)
ids
| _ -> failWith "Expected an array"
end
| None -> failWith "Expected an `ids` property"
end
| _ -> failWith "Expected an object"
(* prints `1, 2, 3` *)
let _ =
Js.log @@ getIds {| { "ids" : [1, 2, 3 ] } |}
</code></pre> </pre>
</div>
</div>
<pre><span id="VALstringify"><span class="keyword">val</span> stringify</span> : <code class="type"><a href="Js_json.html#TYPEt">t</a> -> string</code></pre><div class="info ">
<div class="not-examples">
<code class="code">stringify json</code> formats the JSON data structure as a string
<p>
<b>Returns</b> the string representation of a given JSON data structure<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* Creates and stringifies a simple JS object *)
let dict = Js.Dict.empty () in
Js.Dict.set dict "name" (Js.Json.string "John Doe");
Js.Dict.set dict "age" (Js.Json.numberOfInt 30);
Js.Dict.set dict "likes"
(Js.Json.stringArray [|"bucklescript";"ocaml";"js"|]);
Js.log @@ Js.Json.stringify (Js.Json.object_ dict)
</code></pre> </pre>
</div>
</div>
<pre><span id="VALstringifyAny"><span class="keyword">val</span> stringifyAny</span> : <code class="type">'a -> string option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">stringifyAny value</code> formats any <code class="code">value</code> into a JSON string<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints `["foo", "bar"]` *)
Js.log @@ Js.Json.stringify [| "foo"; "bar" |]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALreify_type"><span class="keyword">val</span> reify_type</span> : <code class="type">'a -> 'b <a href="Js_json.html#TYPEkind">kind</a> * 'b</code></pre><div class="info ">
<div class="not-examples">
<div class="warning">
<span class="label">Deprecated.</span>
Please use <a href="Js_json.html#VALreifyType"><code class="code">Js_json.reifyType</code></a> instead
</div>
</div>
</div>
</body></html>