{"id":1034,"date":"2026-03-04T08:32:06","date_gmt":"2026-03-04T08:32:06","guid":{"rendered":"https:\/\/www.julianreed.net\/?page_id=1034"},"modified":"2026-03-04T08:32:07","modified_gmt":"2026-03-04T08:32:07","slug":"openapi-specification-viewer","status":"publish","type":"page","link":"https:\/\/www.julianreed.net\/?page_id=1034","title":{"rendered":"OpenAPI Specification Viewer"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">A Clean, Client-Side Tool for Exploring API Documentation<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What It Does<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API&#8217;s structure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Supports all OAS versions<\/strong>\u00a0\u2014 2.0 (Swagger), 3.0, and 3.1<\/li>\n\n\n\n<li><strong>Works with both formats<\/strong>\u00a0\u2014 YAML and JSON parsed automatically<\/li>\n\n\n\n<li><strong>No data leaves your browser<\/strong>\u00a0\u2014 everything processes client-side<\/li>\n\n\n\n<li><strong>Expandable sections<\/strong>\u00a0\u2014 click to reveal parameters, schemas, and response details<\/li>\n\n\n\n<li><strong>Visual method badges<\/strong>\u00a0\u2014 color-coded GET, POST, PUT, DELETE indicators<\/li>\n\n\n\n<li><strong>Quick navigation<\/strong>\u00a0\u2014 sidebar tree for instant access to any endpoint or schema<\/li>\n\n\n\n<li><strong>Works offline<\/strong>\u00a0\u2014 after first load, no internet required<\/li>\n\n\n\n<li><strong>Mobile-friendly<\/strong>\u00a0\u2014 responsive design works on any device<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">How to Use<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Upload a File:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Go to\u00a0<a href=\"https:\/\/www.julianreed.net\/oas-viewer.html\">julianreed.net\/oas-viewer.html<\/a><\/li>\n\n\n\n<li>Click\u00a0<strong>Upload File<\/strong>\u00a0tab<\/li>\n\n\n\n<li>Choose your\u00a0<code>.yaml<\/code>,\u00a0<code>.yml<\/code>, or\u00a0<code>.json<\/code>\u00a0OAS file<\/li>\n\n\n\n<li>Navigate using the sidebar or scroll through endpoints<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Paste Content:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Go to\u00a0<a href=\"https:\/\/www.julianreed.net\/oas-viewer.html\">julianreed.net\/oas-viewer.html<\/a><\/li>\n\n\n\n<li>Click\u00a0<strong>Paste Content<\/strong>\u00a0tab<\/li>\n\n\n\n<li>Paste your OpenAPI specification<\/li>\n\n\n\n<li>Click\u00a0<strong>Parse Specification<\/strong><\/li>\n\n\n\n<li>Explore your API structure<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Navigation:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sidebar<\/strong>\u00a0\u2014 click any endpoint or schema to jump directly to it<\/li>\n\n\n\n<li><strong>Expandable sections<\/strong>\u00a0\u2014 click &#8220;Parameters&#8221;, &#8220;Request Body&#8221;, or &#8220;Responses&#8221; to reveal details<\/li>\n\n\n\n<li><strong>Method badges<\/strong>\u00a0\u2014 color-coded for quick identification<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Use Cases<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reviewing ISO 20022 payment schemas (pain.001, pacs.008, camt.054)<\/li>\n\n\n\n<li>Quick API specification inspection during development<\/li>\n\n\n\n<li>Client-facing API documentation without complex hosting<\/li>\n\n\n\n<li>Offline API spec viewing for sensitive projects<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API&#8217;s structure. Benefits How to Use Upload a File: Paste Content: Navigation: Use Cases<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","footnotes":""},"class_list":["post-1034","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API&#039;s structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.julianreed.net\/?page_id=1034\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_GB\" \/>\n\t\t<meta property=\"og:site_name\" content=\"changing my mind -\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"OpenAPI Specification Viewer - changing my mind\" \/>\n\t\t<meta property=\"og:description\" content=\"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API&#039;s structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/www.julianreed.net\/?page_id=1034\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-03-04T08:32:06+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-03-04T08:32:07+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary\" \/>\n\t\t<meta name=\"twitter:title\" content=\"OpenAPI Specification Viewer - changing my mind\" \/>\n\t\t<meta name=\"twitter:description\" content=\"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API&#039;s structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/?page_id=1034#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.julianreed.net#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.julianreed.net\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/?page_id=1034#listItem\",\"name\":\"OpenAPI Specification Viewer\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/?page_id=1034#listItem\",\"position\":2,\"name\":\"OpenAPI Specification Viewer\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.julianreed.net#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/#organization\",\"name\":\"julianreed.net\",\"url\":\"https:\\\/\\\/www.julianreed.net\\\/\",\"sameAs\":[\"https:\\\/\\\/www.pinterest.co.uk\\\/julianpreed\\\/\"]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/?page_id=1034#webpage\",\"url\":\"https:\\\/\\\/www.julianreed.net\\\/?page_id=1034\",\"name\":\"OpenAPI Specification Viewer - changing my mind\",\"description\":\"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \\u2014 no uploads, no servers, just instant visualization of your API's structure. Benefits Supports all OAS versions \\u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \\u2014 YAML and\",\"inLanguage\":\"en-GB\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/?page_id=1034#breadcrumblist\"},\"datePublished\":\"2026-03-04T08:32:06+00:00\",\"dateModified\":\"2026-03-04T08:32:07+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/#website\",\"url\":\"https:\\\/\\\/www.julianreed.net\\\/\",\"name\":\"JulianReed.net\",\"inLanguage\":\"en-GB\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.julianreed.net\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"OpenAPI Specification Viewer - changing my mind","description":"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API's structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and","canonical_url":"https:\/\/www.julianreed.net\/?page_id=1034","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/www.julianreed.net\/?page_id=1034#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/www.julianreed.net#listItem","position":1,"name":"Home","item":"https:\/\/www.julianreed.net","nextItem":{"@type":"ListItem","@id":"https:\/\/www.julianreed.net\/?page_id=1034#listItem","name":"OpenAPI Specification Viewer"}},{"@type":"ListItem","@id":"https:\/\/www.julianreed.net\/?page_id=1034#listItem","position":2,"name":"OpenAPI Specification Viewer","previousItem":{"@type":"ListItem","@id":"https:\/\/www.julianreed.net#listItem","name":"Home"}}]},{"@type":"Organization","@id":"https:\/\/www.julianreed.net\/#organization","name":"julianreed.net","url":"https:\/\/www.julianreed.net\/","sameAs":["https:\/\/www.pinterest.co.uk\/julianpreed\/"]},{"@type":"WebPage","@id":"https:\/\/www.julianreed.net\/?page_id=1034#webpage","url":"https:\/\/www.julianreed.net\/?page_id=1034","name":"OpenAPI Specification Viewer - changing my mind","description":"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API's structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and","inLanguage":"en-GB","isPartOf":{"@id":"https:\/\/www.julianreed.net\/#website"},"breadcrumb":{"@id":"https:\/\/www.julianreed.net\/?page_id=1034#breadcrumblist"},"datePublished":"2026-03-04T08:32:06+00:00","dateModified":"2026-03-04T08:32:07+00:00"},{"@type":"WebSite","@id":"https:\/\/www.julianreed.net\/#website","url":"https:\/\/www.julianreed.net\/","name":"JulianReed.net","inLanguage":"en-GB","publisher":{"@id":"https:\/\/www.julianreed.net\/#organization"}}]},"og:locale":"en_GB","og:site_name":"changing my mind -","og:type":"article","og:title":"OpenAPI Specification Viewer - changing my mind","og:description":"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API's structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and","og:url":"https:\/\/www.julianreed.net\/?page_id=1034","article:published_time":"2026-03-04T08:32:06+00:00","article:modified_time":"2026-03-04T08:32:07+00:00","twitter:card":"summary","twitter:title":"OpenAPI Specification Viewer - changing my mind","twitter:description":"A Clean, Client-Side Tool for Exploring API Documentation What It Does A lightweight viewer that lets you inspect OpenAPI specifications (YAML or JSON) directly in your browser \u2014 no uploads, no servers, just instant visualization of your API's structure. Benefits Supports all OAS versions \u2014 2.0 (Swagger), 3.0, and 3.1 Works with both formats \u2014 YAML and"},"aioseo_meta_data":{"post_id":"1034","title":null,"description":null,"keywords":null,"keyphrases":{"focus":{"keyphrase":"","score":0,"analysis":{"keyphraseInTitle":{"score":0,"maxScore":9,"error":1}}},"additional":[]},"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":"","og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"WebPage","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":"-1","robots_max_videopreview":"-1","robots_max_imagepreview":"large","priority":null,"frequency":"default","local_seo":null,"breadcrumb_settings":null,"limit_modified_date":false,"ai":{"faqs":[],"keyPoints":[],"titles":[],"descriptions":[],"socialPosts":{"email":[],"linkedin":[],"twitter":[],"facebook":[],"instagram":[]}},"created":"2026-03-04 08:32:07","updated":"2026-03-04 08:40:46","seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.julianreed.net\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">\u00bb<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tOpenAPI Specification Viewer\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/www.julianreed.net"},{"label":"OpenAPI Specification Viewer","link":"https:\/\/www.julianreed.net\/?page_id=1034"}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.julianreed.net\/index.php?rest_route=\/wp\/v2\/pages\/1034","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.julianreed.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.julianreed.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.julianreed.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.julianreed.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1034"}],"version-history":[{"count":1,"href":"https:\/\/www.julianreed.net\/index.php?rest_route=\/wp\/v2\/pages\/1034\/revisions"}],"predecessor-version":[{"id":1035,"href":"https:\/\/www.julianreed.net\/index.php?rest_route=\/wp\/v2\/pages\/1034\/revisions\/1035"}],"wp:attachment":[{"href":"https:\/\/www.julianreed.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}