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node-red/packages/node_modules/@node-red/nodes/locales/en-US/parsers/70-JSON.html

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<script type="text/x-red" data-help-name="json">
<p>Converts between a JSON string and its JavaScript object representation, in either direction.</p>
<h3>Inputs</h3>
<dl class="message-properties">
<dt>payload<span class="property-type">object | string</span></dt>
<dd>A JavaScript object or JSON string.</dd>
<dt>schema<span class="property-type">object</span></dt>
<dd>An optional JSON Schema object to validate the payload against.
The property will be deleted before the <code>msg</code> is sent to the next node.</dd>
</dl>
<h3>Outputs</h3>
<dl class="message-properties">
<dt>payload<span class="property-type">object | string</span></dt>
<dd>
<ul>
<li>If the input is a JSON string it tries to parse it to a JavaScript object.</li>
<li>If the input is a JavaScript object it creates a JSON string. The string can optionally be well-formatted.</li>
</ul>
</dd>
<dt>schemaError<span class="property-type">array</span></dt>
<dd>If JSON schema validation fails, the catch node will have a <code>schemaError</code> property
containing an array of errors.</dd>
</dl>
<h3>Details</h3>
<p>By default, the node operates on <code>msg.payload</code>, but can be configured
to convert any message property.</p>
<p>The node can also be configured to ensure a particular encoding instead of toggling
between the two. This can be used, for example, with the <code>HTTP In</code>
node to ensure the payload is a parsed object even if an incoming request
did not set its content-type correctly for the HTTP In node to do the conversion.</p>
<p>If the node is configured to ensure the property is encoded as a String and it
receives a String, no further checks will be made of the property. It will
not check the String is valid JSON nor will it reformat it if the format option
is selected.</p>
<p>For more details about JSON Schema you can consult the specification
<a href="http://json-schema.org/latest/json-schema-validation.html">here</a>.</p>
</script>