{"id":899,"date":"2026-07-02T09:03:07","date_gmt":"2026-07-02T09:03:07","guid":{"rendered":"https:\/\/www.vpascode.com\/de\/docs\/uncategorized\/mermaid-js-playbook\/mermaid-js-venn-diagram-syntax-layout-guide\/"},"modified":"2026-07-29T08:34:31","modified_gmt":"2026-07-29T08:34:31","slug":"mermaid-js-venn-diagram-syntax-layout-guide","status":"publish","type":"ld_docs","link":"https:\/\/www.vpascode.com\/de\/docs\/vpascode-docs\/mermaid-js-playbook\/mermaid-js-venn-diagram-syntax-layout-guide\/","title":{"rendered":"Mermaid.js Venn Diagram Syntax &#038; Layout Guide"},"content":{"rendered":"<p>Venn diagrams show logical relationships between different sets or groups of data using overlapping circles. This text-based approach allows you to quickly illustrate concepts that live at the intersection of multiple categories without messing with manual graphic design tools.<\/p>\n<h2>Basic Syntax Structure<\/h2>\n<p>Every Venn diagram starts with the <code>venn-beta<\/code> declaration, followed by defining individual groups using the <code>set<\/code> keyword. You then define how those groups overlap using the <code>union<\/code> keyword.<\/p>\n            <div class=\"vpascode-viewer-container vpascode-fancy-active\">\r\n                                <div class=\"vpascode-header\">\r\n                    <span class=\"vpascode-lang-label\">Mermaid<\/span>\r\n                    <a href=\"https:\/\/www.vpascode.com\/#mermaid:eNorS83L001KLUnk5SpOLVFwL8ovLXBUiFbySUxKzVFwVIpFEneCizuBxEvzMvPzoDp0ECo880pSi4pTk0tAsmDlSrEAk6shOw==\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 8px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                <div class=\"vpascode-code-wrapper\">\r\n                    <pre class=\"lang-mermaid\"><code data-language=\"mermaid\" class=\"language-mermaid\">venn-beta\r\nset GroupA [\"Label A\"]\r\nset GroupB [\"Label B\"]\r\nunion GroupA, GroupB [\"Intersection Label\"]<\/code><\/pre>                <\/div>\r\n                <div class=\"vpascode-actions\">\r\n                    <a href=\"https:\/\/www.vpascode.com\/#mermaid:eNorS83L001KLUnk5SpOLVFwL8ovLXBUiFbySUxKzVFwVIpFEneCizuBxEvzMvPzoDp0ECo880pSi4pTk0tAsmDlSrEAk6shOw==\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 6px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n<p id=\"vECsuep\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-901 \" src=\"https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a46298fd9cf8.png\" alt=\"\" srcset=\"https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a46298fd9cf8.png 800w, https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a46298fd9cf8-300x169.png 300w, https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a46298fd9cf8-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Syntax Reference<\/h2>\n<p>The table below breaks down the primary elements used to construct a Venn diagram in Mermaid.js.<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"5\">\n<thead>\n<tr>\n<th>Component<\/th>\n<th>Description<\/th>\n<th>Syntax Example<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Declaration<\/strong><\/td>\n<td>Initializes the Venn diagram renderer (currently in beta).<\/td>\n<td><code>venn-beta<\/code><\/td>\n<\/tr>\n<tr>\n<td><strong>Set<\/strong><\/td>\n<td>Defines a standalone data category or circle. Always supply an identifier and a display label.<\/td>\n<td><code>set A [\"Marketing Team\"]<\/code><\/td>\n<\/tr>\n<tr>\n<td><strong>Union<\/strong><\/td>\n<td>Defines an overlapping area between two or more sets. Separate identifiers with a comma.<\/td>\n<td><code>union A,B [\"Shared Goals\"]<\/code><\/td>\n<\/tr>\n<tr>\n<td><strong>Size Modifier<\/strong><\/td>\n<td>An optional <code>:N<\/code> suffix that scales the circle or intersection size relatively.<\/td>\n<td><code>set A [\"Large Group\"]:15<\/code><\/td>\n<\/tr>\n<tr>\n<td><strong>Text Node<\/strong><\/td>\n<td>An indented block used to list specific points directly inside a set or an intersection area.<\/td>\n<td><code>text ItemId [\"Specific Bullet\"]<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Real-World Blueprint: Product Opportunity Analysis<\/h2>\n<p>This blueprint showcases a classic product development strategy framework mapping out user pain points, business goals, and technical feasibility to pinpoint the ideal feature release.<\/p>\n            <div class=\"vpascode-viewer-container vpascode-fancy-active\">\r\n                                <div class=\"vpascode-header\">\r\n                    <span class=\"vpascode-lang-label\">Mermaid<\/span>\r\n                    <a href=\"https:\/\/www.vpascode.com\/#mermaid:eNqFkEEKwjAQRfeF3iF0rYdQQXEjhVpdSBfT+tGBOpFkoujpTRWLtAt3mfDe\/5PcIDKtoZQmHmpKD7cBjuaQdUeTE4vJLYv6rPog8+BZ4P3KUhux72h21Ab01BbNeQnyXLeIVDcKN9FY0JVqblkfHZomQdhK3zsZxhfqSHHixuxZ3ulDYdBUysUKlJ\/xEfFag8OP9ps+UteicBJrZ0HthTQK\/3ccpWzPMLmzx9CoKe6If1FcrWbVC4eNfW8=\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 8px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                <div class=\"vpascode-code-wrapper\">\r\n                    <pre class=\"lang-mermaid\"><code data-language=\"mermaid\" class=\"language-mermaid\">venn-beta\r\nset UserNeed [\"User Pain Points\"]\r\nset BusinessGoal [\"Business Values\"]\r\nset TechFeasible [\"Technical Capability\"]\r\n\r\nunion UserNeed, BusinessGoal [\"Strategic Wins\"]\r\nunion UserNeed, TechFeasible [\"Unmonetized Features\"]\r\nunion BusinessGoal, TechFeasible [\"Internal Automation\"]\r\n\r\nunion UserNeed, BusinessGoal, TechFeasible [\"The Product Sweet Spot\"]<\/code><\/pre>                <\/div>\r\n                <div class=\"vpascode-actions\">\r\n                    <a href=\"https:\/\/www.vpascode.com\/#mermaid:eNqFkEEKwjAQRfeF3iF0rYdQQXEjhVpdSBfT+tGBOpFkoujpTRWLtAt3mfDe\/5PcIDKtoZQmHmpKD7cBjuaQdUeTE4vJLYv6rPog8+BZ4P3KUhux72h21Ab01BbNeQnyXLeIVDcKN9FY0JVqblkfHZomQdhK3zsZxhfqSHHixuxZ3ulDYdBUysUKlJ\/xEfFag8OP9ps+UteicBJrZ0HthTQK\/3ccpWzPMLmzx9CoKe6If1FcrWbVC4eNfW8=\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 6px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n<p id=\"CAQxabW\"><img decoding=\"async\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-902 \" src=\"https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629b4d8f03.png\" alt=\"\" srcset=\"https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629b4d8f03.png 800w, https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629b4d8f03-300x169.png 300w, https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629b4d8f03-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<hr \/>\n<p><em><strong>Syntax Tip:<\/strong> When using three or more categories, Mermaid automatically maps the nested intersections for you. Simply declare the final 3-way <code>union<\/code> with all three identifiers separated by commas, and the engine will place the label perfectly in the center overlap.<\/em><\/p>\n<hr \/>\n<h2>Advanced Concept: Bullet Points &amp; Sizing<\/h2>\n<p>For more technical documentation, you can insert specific text bullets directly into your circles and adjust circle scaling to represent real proportions (like database sizes or team headcounts).<\/p>\n            <div class=\"vpascode-viewer-container vpascode-fancy-active\">\r\n                                <div class=\"vpascode-header\">\r\n                    <span class=\"vpascode-lang-label\">Mermaid<\/span>\r\n                    <a href=\"https:\/\/www.vpascode.com\/#mermaid:eNpNj80OgjAQhO8kvEMDVzXF\/3AToYmJQbRH4wFxNUjTGroafXtbUPG0uzOTr9MHSNk\/AuauowEJq5VEsveaCfLkHcKAug4hCE\/jBsbaQV6gd+jEoRGXnFvJIqK8qIxixwcw+WUjC0jVCQZX\/YeILCJTGi818O3aOq5zl6WSbaHeF8ruQvQ5msNwR12Fhru5gVxkK8JvUPzTWYNPzWpeJZzvWr7Gl4DPh8+lEKGfzNmYxT2isVYVhD6ls2EUfJNNhTbIYkaTeRdM6JRS+gbU\/WBa\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 8px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n                                <div class=\"vpascode-code-wrapper\">\r\n                    <pre class=\"lang-mermaid\"><code data-language=\"mermaid\" class=\"language-mermaid\">venn-beta\r\nset Front [\"Frontend\"]:10\r\n  text F1 [\"React\"]\r\n  text F2 [\"CSS\"]\r\nset Back [\"Backend\"]:15\r\n  text B1 [\"Node.js\"]\r\n  text B2 [\"PostgreSQL\"]\r\n\r\nunion Front, Back [\"Full-Stack\"]:3\r\n  text FB1 [\"OpenAPI Specs\"]\r\n  text FB2 [\"Next.js SSR\"]\r\n\r\nstyle Front fill:#E8F4FD, stroke:#0072B1\r\nstyle Back fill:#FDF0E8, stroke:#E06000<\/code><\/pre>                <\/div>\r\n                <div class=\"vpascode-actions\">\r\n                    <a href=\"https:\/\/www.vpascode.com\/#mermaid:eNpNj80OgjAQhO8kvEMDVzXF\/3AToYmJQbRH4wFxNUjTGroafXtbUPG0uzOTr9MHSNk\/AuauowEJq5VEsveaCfLkHcKAug4hCE\/jBsbaQV6gd+jEoRGXnFvJIqK8qIxixwcw+WUjC0jVCQZX\/YeILCJTGi818O3aOq5zl6WSbaHeF8ruQvQ5msNwR12Fhru5gVxkK8JvUPzTWYNPzWpeJZzvWr7Gl4DPh8+lEKGfzNmYxT2isVYVhD6ls2EUfJNNhTbIYkaTeRdM6JRS+gbU\/WBa\" \r\n                       target=\"_blank\" \r\n                       rel=\"noopener noreferrer\" \r\n                       class=\"vpascode-fancy-btn\">\r\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"margin-right: 6px;\"><path d=\"M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7\"><\/path><path d=\"M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z\"><\/path><\/svg>\r\n                        <span>Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n<p id=\"ssNvrzX\"><img decoding=\"async\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-903 \" src=\"https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629c718741.png\" alt=\"\" srcset=\"https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629c718741.png 800w, https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629c718741-300x169.png 300w, https:\/\/www.vpascode.com\/de\/wp-content\/uploads\/sites\/4\/2026\/07\/img_6a4629c718741-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Common Syntax Pitfalls<\/h2>\n<p>Venn diagrams are brand new to the Mermaid syntax core. Keep these three structural design rules in mind to make sure your graphics display smoothly:<\/p>\n<ul>\n<li><strong>Prioritize Order:<\/strong> You must completely declare your individual <code>set<\/code> lines before referencing them in any <code>union<\/code> block. Referencing an identifier that hasn&#8217;t been explicitly created will break the build.<\/li>\n<li><strong>Watch Union Commas:<\/strong> When building a <code>union<\/code> of multiple sets, make sure there are commas separating your identifiers, but no comma trailing right before the bracket label. <code>union A, B, C [\"Label\"]<\/code> is correct.<\/li>\n<li><strong>Beta Version Stability:<\/strong> Because this layout style uses the <code>venn-beta<\/code> flag, advanced element custom styling rules may adjust across versions. Stick to basic hex color codes for <code>fill<\/code> and <code>stroke<\/code> variables for maximum cross-compatibility.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Venn diagrams show logical relationships between different sets or groups of data using overlapping circles. This text-based approach allows you to quickly illustrate concepts that live at the intersection of multiple categories without messing with manual graphic design tools. Basic&#8230;<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":48,"menu_order":11,"template":"","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"ld_collection":[14],"class_list":["post-899","ld_docs","type-ld_docs","status-publish","hentry","ld_collection-vpascode-docs"],"yoast_head":"<!-- This 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