The fastest way to create an HTML app
This report summarizes scanner evidence for AnswerDotAI/fasthtml, a Jupyter Notebook project with 7,052 GitHub stars. SynthScan examined 21,110 lines of code across 77 source files, recording 203 pattern matches distributed across 13 syntactic categories. The legacy adjusted pattern signal is 10.6 (Moderate pattern signal); it is not an authorship estimate.
Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.
Use each vector to guide manual verification of the underlying findings.
Can maintainers explain intent, assumptions, and trade-offs? 19 finding(s).
Are imports declared and package/API names verified? 164 finding(s).
Are wrappers, guards, and repeated structures necessary? 29 finding(s).
Which changes need focused human review? 203 finding(s).
This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.
Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.
This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.
The scanner identified 203 distinct pattern matches across 13 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | demo/main.py | 1 | CODE | |
| LOW | tools/mk_pyi.py | 2 | CODE | |
| LOW | htmxv4_migration/hx_multipart_timelapse.py | 1 | CODE | |
| LOW | htmxv4_migration/hx_multipart_timelapse.py | 5 | CODE | |
| LOW | …migration/compat_hx_tests/v2_incompatible_v4_events.py | 1 | CODE | |
| LOW | …_migration/compat_hx_tests/v4_incompatible_v2_attrs.py | 1 | CODE | |
| LOW | htmxv4_migration/compat_hx_tests/v2_compatible.py | 1 | CODE | |
| LOW | …migration/compat_hx_tests/v4_incompatible_v2_events.py | 1 | CODE | |
| LOW | htmxv4_migration/compat_hx_tests/v4_compatible.py | 1 | CODE | |
| LOW | …_migration/compat_hx_tests/v2_incompatible_v4_attrs.py | 1 | CODE | |
| LOW | nbs/explains/stripe_otp.py | 9 | CODE | |
| LOW | nbs/tutorials/01_quickdraw.py | 1 | CODE | |
| LOW | nbs/tutorials/hello_world.py | 1 | CODE | |
| LOW | nbs/tutorials/02_quickdraw.py | 1 | CODE | |
| LOW | nbs/tutorials/03_quickdraw.py | 1 | CODE | |
| LOW | tests/test_toaster.py | 1 | CODE | |
| LOW | examples/todos2.py | 1 | CODE | |
| LOW | examples/adv_app_strip.py | 1 | CODE | |
| LOW | examples/adv_app_strip.py | 2 | CODE | |
| LOW | examples/adv_app_strip.py | 3 | CODE | |
| LOW | examples/user_app.py | 3 | CODE | |
| LOW | examples/user_app.py | 4 | CODE | |
| LOW | examples/basic_ws.py | 2 | CODE | |
| LOW | examples/todos3.py | 2 | CODE | |
| LOW | examples/adv_app.py | 6 | CODE | |
| LOW | examples/adv_app.py | 7 | CODE | |
| LOW | examples/adv_app.py | 8 | CODE | |
| LOW | examples/chat_ws.py | 1 | CODE | |
| LOW | examples/minimal.py | 2 | CODE | |
| LOW | examples/minimal.py | 3 | CODE | |
| LOW | examples/todos4.py | 1 | CODE | |
| LOW | examples/todos4.py | 2 | CODE | |
| LOW | examples/todos1.py | 1 | CODE | |
| LOW | fasthtml/starlette.py | 1 | CODE | |
| LOW | fasthtml/starlette.py | 2 | CODE | |
| LOW | fasthtml/starlette.py | 3 | CODE | |
| LOW | fasthtml/starlette.py | 4 | CODE | |
| LOW | fasthtml/starlette.py | 5 | CODE | |
| LOW | fasthtml/starlette.py | 6 | CODE | |
| LOW | fasthtml/starlette.py | 6 | CODE | |
| LOW | fasthtml/starlette.py | 6 | CODE | |
| LOW | fasthtml/starlette.py | 6 | CODE | |
| LOW | fasthtml/starlette.py | 6 | CODE | |
| LOW | fasthtml/starlette.py | 7 | CODE | |
| LOW | fasthtml/starlette.py | 8 | CODE | |
| LOW | fasthtml/starlette.py | 9 | CODE | |
| LOW | fasthtml/starlette.py | 9 | CODE | |
| LOW | fasthtml/starlette.py | 9 | CODE | |
| LOW | fasthtml/starlette.py | 9 | CODE | |
| LOW | fasthtml/starlette.py | 9 | CODE | |
| LOW | fasthtml/starlette.py | 9 | CODE | |
| LOW | fasthtml/starlette.py | 10 | CODE | |
| LOW | fasthtml/starlette.py | 10 | CODE | |
| LOW | fasthtml/starlette.py | 10 | CODE | |
| LOW | fasthtml/starlette.py | 10 | CODE | |
| LOW | fasthtml/starlette.py | 11 | CODE | |
| LOW | fasthtml/starlette.py | 12 | CODE | |
| LOW | fasthtml/starlette.py | 13 | CODE | |
| LOW | fasthtml/starlette.py | 14 | CODE | |
| LOW | fasthtml/starlette.py | 14 | CODE | |
| 97 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | nbs/tutorials/03_quickdraw.py | 41 | if (data && Object.keys(data).length > 0) {{ | CODE |
| HIGH | fasthtml/xtend.py | 126 | const p = _p ? me(_p) : null; | CODE |
| HIGH | fasthtml/pico.py | 90 | elt = "(event.detail.ctx?.sourceElement || event.detail.elt)" | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | fasthtml/live_reload.py | 31 | except WebSocketDisconnect: pass | CODE |
| HIGH | fasthtml/core.py | 663 | except StopAsyncIteration: pass | CODE |
| HIGH | fasthtml/jupyter.py | 20 | except ImportError: pass | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | nbs/llms-ctx-full.txt | 0 | import { marked } from "https://cdn.jsdelivr.net/npm/marked/lib/marked.esm.js"; proc_htmx('.markdown', e => e.innerhtml | STRING |
| HIGH | nbs/llms-ctx.txt | 0 | import { marked } from "https://cdn.jsdelivr.net/npm/marked/lib/marked.esm.js"; proc_htmx('.markdown', e => e.innerhtml | STRING |
| HIGH | examples/adv_app.py | 0 | import { marked } from "https://cdn.jsdelivr.net/npm/marked/lib/marked.esm.js"; proc_htmx('.markdown', e => e.innerhtml | STRING |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | nbs/explains/stripe_otp.py | 4 | __all__ = ['DOMAIN_URL', 'app_nm', 'price_list', 'price', 'bware', 'app', 'rt', 'WEBHOOK_SECRET', 'db', 'payments', | CODE |
| LOW | fasthtml/live_reload.py | 5 | __all__ = ["FastHTMLWithLiveReload"] | CODE |
| LOW | fasthtml/js.py | 8 | __all__ = ['marked_imp', 'npmcdn', 'light_media', 'dark_media', 'MarkdownJS', 'KatexMarkdownJS', 'HighlightJS', 'Sortabl | CODE |
| LOW | fasthtml/xtend.py | 8 | __all__ = ['sid_scr', 'A', 'AX', 'Form', 'Hidden', 'CheckboxX', 'Script', 'Style', 'double_braces', 'undouble_braces', | CODE |
| LOW | fasthtml/core.py | 48 | __all__ = ['empty', 'htmx_hdrs', 'fh_cfg', 'htmx_resps', 'DEF_MAXPART', 'htmx_exts', 'htmxsrc', 'htmx4src', 'fhjsscr', ' | CODE |
| LOW | fasthtml/fastapp.py | 8 | __all__ = ['fast_app'] | CODE |
| LOW | fasthtml/cli.py | 4 | __all__ = ['railway_link', 'railway_deploy'] | CODE |
| LOW | fasthtml/pico.py | 8 | __all__ = ['picocss', 'picolink', 'picocondcss', 'picocondlink', 'set_pico_cls', 'Card', 'Group', 'Search', 'Grid', 'Dia | CODE |
| LOW | fasthtml/svg.py | 8 | __all__ = ['g', 'svg_inb', 'Svg', 'ft_svg', 'Rect', 'Circle', 'Ellipse', 'transformd', 'Line', 'Polyline', 'Polygon', 'T | CODE |
| LOW | fasthtml/components.py | 8 | __all__ = ['named', 'html_attrs', 'hx_attrs', 'hx_attrs_4only', 'hx_evts', 'hx_evts_4only', 'js_evts', 'hx_attrs_annotat | CODE |
| LOW | fasthtml/oauth.py | 8 | __all__ = ['log', 'http_patterns', 'GoogleAppClient', 'GitHubAppClient', 'HuggingFaceClient', 'DiscordAppClient', | CODE |
| LOW | fasthtml/jupyter.py | 8 | __all__ = ['nb_serve', 'nb_serve_async', 'show', 'render_ft', 'htmx_config_port', 'JupyUvi', 'JupyUviAsync', 'HTMX', 'ws | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | fasthtml/xtend.py | 90 | CODE | |
| LOW | fasthtml/core.py | 1011 | CODE | |
| LOW | fasthtml/core.py | 687 | CODE | |
| LOW | fasthtml/fastapp.py | 27 | CODE | |
| LOW | fasthtml/svg.py | 105 | CODE | |
| LOW | fasthtml/oauth.py | 231 | CODE | |
| LOW | fasthtml/jupyter.py | 123 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | examples/pep8_app.py | 45 | # The `FastHTML` class is a subclass of `Starlette`, so you can use any parameters that `Starlette` accepts. | COMMENT |
| MEDIUM | examples/adv_app.py | 41 | # The `FastHTML` class is a subclass of `Starlette`, so you can use any parameters that `Starlette` accepts. In addition | STRING |
| MEDIUM | examples/adv_app.py | 67 | # fasttag objects are callable. Calling them adds children and attributes to the tag. Therefore you can use them lik | STRING |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | CHANGELOG.md | 361 | }); | COMMENT |
| LOW | nbs/llms-ctx-full.txt | 2521 | Input(id='pwd', type='password', placeholder='Password'), | COMMENT |
| LOW | nbs/llms-ctx.txt | 2501 | # You can also use plain HTML strings in handlers and headers, which will be auto-escaped, unless you use `Safe(...s | COMMENT |
| LOW | examples/adv_app.py | 61 | # This function handles GET and POST requests to the `/login` path, because the name of the function automatically becom | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | nbs/llms-ctx-full.txt | 256 | user_profile_path = profile.to(email="user@example.com") # '/profile?email=user%40example.com' | CODE |
| LOW | nbs/llms-ctx-full.txt | 3209 | username = "John Doe" | STRING |
| LOW | nbs/llms-ctx-full.txt | 3249 | app.state.ADMIN_EMAIL = 'admin@example.org' | STRING |
| LOW | nbs/llms-ctx.txt | 242 | user_profile_path = profile.to(email="user@example.com") # '/profile?email=user%40example.com' | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | examples/adv_app.py | 61 | # This function handles GET and POST requests to the `/login` path, because the name of the function automatically becom | STRING |
| MEDIUM | fasthtml/cli.py | 35 | mount:bool_arg=True # Create a mounted volume at /app/data? | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | nbs/explains/stripe_otp.py | 103 | except Exception as e: | CODE |
| LOW | nbs/explains/stripe_otp.py | 179 | except Exception as e: return P(f"Refund failed: {str(e)}") | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | tests/test_toaster.py | 48 | def test_get_toaster_with_typehint(): | CODE |
| LOW | tests/test_toaster.py | 55 | def test_toast_container_in_response(): | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | fasthtml/components.py | 148 | CODE |