René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"How can I read a CSV file into a persistent DataFrame that can be used later in my script?","articleBody":"I am trying to read a CSV file into a DataFrame that I can use later in my code for a Leaflet map. Based on the Danfo.js documentation, here's what my code currently looks like:\n\n```\ndfd.readCSV(\"my_online_csv_file.csv\")\n.then(df =\u003e {\n    df.describe().print()\n\n}).catch(err =\u003e {\n    console.log(err);\n})\n```\n\nThis code does indeed output some descriptive stats within my console. However, if I then try to access this DataFrame outside this block via `df.head().print();`, I get the following error:\n\n`Uncaught ReferenceError: df is not defined`\n\nI also tried the following setup:\n\n```\ndf_data = dfd.readCSV(\"my_online_csv_file.csv\");\ndf.head().print()\n```\n\nHowever, this produced the following error:\n\n```\nUncaught TypeError: df.head is not a function\n```\n\nIs there an easy way for me to both read in a CSV file and access in later in the function? As a newcomer to both JavaScript and Danfo, I feel like I'm missing something very obvious.\n\n\n","author":{"url":"https://github.com/kburchfiel","@type":"Person","name":"kburchfiel"},"datePublished":"2026-01-07T22:54:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/686/danfojs/issues/686"}