diff --git a/datasette/app.py b/datasette/app.py
index f80d3792..c3d802a4 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -33,6 +33,7 @@ from .views.special import (
     JsonDataView,
     PatternPortfolioView,
     AuthTokenView,
+    ApiExplorerView,
     CreateTokenView,
     LogoutView,
     AllowDebugView,
@@ -1235,6 +1236,10 @@ class Datasette:
             CreateTokenView.as_view(self),
             r"/-/create-token$",
         )
+        add_route(
+            ApiExplorerView.as_view(self),
+            r"/-/api$",
+        )
         add_route(
             LogoutView.as_view(self),
             r"/-/logout$",
diff --git a/datasette/templates/api_explorer.html b/datasette/templates/api_explorer.html
new file mode 100644
index 00000000..034bee60
--- /dev/null
+++ b/datasette/templates/api_explorer.html
@@ -0,0 +1,73 @@
+{% extends "base.html" %}
+
+{% block title %}API Explorer{% endblock %}
+
+{% block content %}
+
+<h1>API Explorer</h1>
+
+<p>Use this tool to try out the Datasette write API.</p>
+
+{% if errors %}
+  {% for error in errors %}
+    <p class="message-error">{{ error }}</p>
+  {% endfor %}
+{% endif %}
+
+<form method="post" id="api-explorer">
+  <div>
+    <label for="auth-token">API token:</label>
+    <input type="text" id="auth-token" name="token" value="" style="width: 40%">
+  </div>
+  <div>
+    <label for="path">API path:</label>
+    <input type="text" id="path" name="path" value="/fixtures/searchable/-/insert" style="width: 40%">
+  </div>
+  <div>
+    <textarea name="json" style="width: 60%; height: 200px; font-family: monospace; font-size: 0.8em;"></textarea>
+  </div>
+  <p><button id="json-format" type="button">Format JSON</button> <input type="submit" value="POST"></p>
+</form>
+
+<script>
+document.querySelector('#json-format').addEventListener('click', (ev) => {
+  ev.preventDefault();
+  const json = document.querySelector('textarea[name="json"]').value;
+  try {
+    const parsed = JSON.parse(json);
+    document.querySelector('textarea[name="json"]').value = JSON.stringify(parsed, null, 2);
+  } catch (e) {
+    alert("Error parsing JSON: " + e);
+  }
+});
+var form = document.getElementById('api-explorer');
+form.addEventListener("submit", (ev) => {
+  ev.preventDefault();
+  var formData = new FormData(form);
+  var json = formData.get('json');
+  var path = formData.get('path');
+  var token = formData.get('token');
+  // Validate JSON
+  try {
+    var data = JSON.parse(json);
+  } catch (err) {
+    alert("Invalid JSON: " + err);
+    return;
+  }
+  // POST JSON to path with content-type application/json
+  fetch(path, {
+    method: 'POST',
+    body: json,
+    headers: {
+      'Content-Type': 'application/json',
+      'Authorization': `Bearer ${token}`
+    }
+  }).then(r => r.json()).then(r => {
+    alert(JSON.stringify(r, null, 2));
+  }).catch(err => {
+    alert("Error: " + err);
+  });
+});
+</script>
+
+{% endblock %}
diff --git a/datasette/views/special.py b/datasette/views/special.py
index b754a2f0..9922a621 100644
--- a/datasette/views/special.py
+++ b/datasette/views/special.py
@@ -235,3 +235,11 @@ class CreateTokenView(BaseView):
                 "token_bits": token_bits,
             },
         )
+
+
+class ApiExplorerView(BaseView):
+    name = "api_explorer"
+    has_json_alternate = False
+
+    async def get(self, request):
+        return await self.render(["api_explorer.html"], request)
diff --git a/tests/test_docs.py b/tests/test_docs.py
index cd5a6c13..e9b813fe 100644
--- a/tests/test_docs.py
+++ b/tests/test_docs.py
@@ -62,7 +62,7 @@ def documented_views():
             if first_word.endswith("View"):
                 view_labels.add(first_word)
     # We deliberately don't document these:
-    view_labels.update(("PatternPortfolioView", "AuthTokenView"))
+    view_labels.update(("PatternPortfolioView", "AuthTokenView", "ApiExplorerView"))
     return view_labels