diff --git a/datasette/static/json-format-highlight-1.0.1.js b/datasette/static/json-format-highlight-1.0.1.js
deleted file mode 100644
index 0e6e2c29..00000000
--- a/datasette/static/json-format-highlight-1.0.1.js
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
-https://github.com/luyilin/json-format-highlight
-From https://unpkg.com/json-format-highlight@1.0.1/dist/json-format-highlight.js
-MIT Licensed
-*/
-(function (global, factory) {
-  typeof exports === "object" && typeof module !== "undefined"
-    ? (module.exports = factory())
-    : typeof define === "function" && define.amd
-      ? define(factory)
-      : (global.jsonFormatHighlight = factory());
-})(this, function () {
-  "use strict";
-
-  var defaultColors = {
-    keyColor: "dimgray",
-    numberColor: "lightskyblue",
-    stringColor: "lightcoral",
-    trueColor: "lightseagreen",
-    falseColor: "#f66578",
-    nullColor: "cornflowerblue",
-  };
-
-  function index(json, colorOptions) {
-    if (colorOptions === void 0) colorOptions = {};
-
-    if (!json) {
-      return;
-    }
-    if (typeof json !== "string") {
-      json = JSON.stringify(json, null, 2);
-    }
-    var colors = Object.assign({}, defaultColors, colorOptions);
-    json = json.replace(/&/g, "&").replace(/</g, "<").replace(/>/g, ">");
-    return json.replace(
-      /("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+]?\d+)?)/g,
-      function (match) {
-        var color = colors.numberColor;
-        if (/^"/.test(match)) {
-          color = /:$/.test(match) ? colors.keyColor : colors.stringColor;
-        } else {
-          color = /true/.test(match)
-            ? colors.trueColor
-            : /false/.test(match)
-              ? colors.falseColor
-              : /null/.test(match)
-                ? colors.nullColor
-                : color;
-        }
-        return '<span style="color: ' + color + '">' + match + "</span>";
-      },
-    );
-  }
-
-  return index;
-});
diff --git a/datasette/templates/api_explorer.html b/datasette/templates/api_explorer.html
index 4927cb8d..32686af1 100644
--- a/datasette/templates/api_explorer.html
+++ b/datasette/templates/api_explorer.html
@@ -3,7 +3,6 @@
 {% block title %}API Explorer{% endblock %}
 
 {% block extra_head %}
-<script src="{{ static('json-format-highlight-1.0.1.js') }}"></script>
 {% endblock %}
 
 {% block content %}
@@ -126,7 +125,7 @@ getForm.addEventListener("submit", (ev) => {
     document.getElementById('response-status').textContent = response.status;
     return response.json();
   }).then((data) => {
-    output.querySelector('pre').innerHTML = jsonFormatHighlight(data);
+    output.querySelector('pre').textContent = JSON.stringify(data, null, 2);
     errorList.style.display = 'none';
   }).catch((error) => {
     alert(error);
@@ -174,7 +173,7 @@ postForm.addEventListener("submit", (ev) => {
     } else {
       errorList.style.display = 'none';
     }
-    output.querySelector('pre').innerHTML = jsonFormatHighlight(data);
+    output.querySelector('pre').textContent = JSON.stringify(data, null, 2);
     output.style.display = 'block';
   }).catch(err => {
     alert("Error: " + err);
diff --git a/datasette/templates/debug_allowed.html b/datasette/templates/debug_allowed.html
index 80249d9c..c73cdfb7 100644
--- a/datasette/templates/debug_allowed.html
+++ b/datasette/templates/debug_allowed.html
@@ -3,7 +3,6 @@
 {% block title %}Allowed Resources{% endblock %}
 
 {% block extra_head %}
-<script src="{{ static('json-format-highlight-1.0.1.js') }}"></script>
 {% include "_permission_ui_styles.html" %}
 {% include "_debug_common_functions.html" %}
 {% endblock %}
@@ -198,7 +197,7 @@ function displayResults(data) {
     }
 
     // Update raw JSON
-    document.getElementById('raw-json').innerHTML = jsonFormatHighlight(data);
+    document.getElementById('raw-json').textContent = JSON.stringify(data, null, 2);
 }
 
 function displayError(data) {
@@ -208,7 +207,7 @@ function displayError(data) {
 
     resultsContent.innerHTML = `<div class="error-message">Error: ${escapeHtml(data.error || 'Unknown error')}</div>`;
 
-    document.getElementById('raw-json').innerHTML = jsonFormatHighlight(data);
+    document.getElementById('raw-json').textContent = JSON.stringify(data, null, 2);
 }
 
 // Disable child input if parent is empty
diff --git a/datasette/templates/debug_check.html b/datasette/templates/debug_check.html
index b9fc636a..c0081c66 100644
--- a/datasette/templates/debug_check.html
+++ b/datasette/templates/debug_check.html
@@ -3,7 +3,6 @@
 {% block title %}Explain a permission decision{% endblock %}
 
 {% block extra_head %}
-<script src="{{ static('json-format-highlight-1.0.1.js') }}"></script>
 {% include "_permission_ui_styles.html" %}
 {% include "_debug_common_functions.html" %}
 <style>
@@ -238,7 +237,7 @@ function displayResult(data) {
     displayRules(data.explanation);
     displayRestrictions(data.explanation.restrictions);
     displayRequirements(data.explanation.required_actions);
-    document.getElementById('raw-json').innerHTML = jsonFormatHighlight(data);
+    document.getElementById('raw-json').textContent = JSON.stringify(data, null, 2);
 }
 
 function displayRules(explanation) {
@@ -298,7 +297,7 @@ function displayError(data) {
     document.getElementById('matching-rules').innerHTML = '';
     document.getElementById('restrictions-section').style.display = 'none';
     document.getElementById('requirements-section').style.display = 'none';
-    document.getElementById('raw-json').innerHTML = jsonFormatHighlight(data);
+    document.getElementById('raw-json').textContent = JSON.stringify(data, null, 2);
 }
 
 form.addEventListener('submit', event => {
diff --git a/datasette/templates/debug_rules.html b/datasette/templates/debug_rules.html
index 233c0e94..a74c18f7 100644
--- a/datasette/templates/debug_rules.html
+++ b/datasette/templates/debug_rules.html
@@ -3,7 +3,6 @@
 {% block title %}Permission Rules{% endblock %}
 
 {% block extra_head %}
-<script src="{{ static('json-format-highlight-1.0.1.js') }}"></script>
 {% include "_permission_ui_styles.html" %}
 {% include "_debug_common_functions.html" %}
 {% endblock %}
@@ -185,7 +184,7 @@ function displayResults(data) {
     }
 
     // Update raw JSON
-    document.getElementById('raw-json').innerHTML = jsonFormatHighlight(data);
+    document.getElementById('raw-json').textContent = JSON.stringify(data, null, 2);
 }
 
 function displayError(data) {
@@ -195,7 +194,7 @@ function displayError(data) {
 
     resultsContent.innerHTML = `<div class="error-message">Error: ${escapeHtml(data.error || 'Unknown error')}</div>`;
 
-    document.getElementById('raw-json').innerHTML = jsonFormatHighlight(data);
+    document.getElementById('raw-json').textContent = JSON.stringify(data, null, 2);
 }
 
 </script>