creditkarma-1099b-fill.js

/*
Make sure your csv has these headers:
description,dateAcquired,dateSold,salesPrice,cost

Convert csv to json.

Paste the following code into the console.

Run fillAll with the json as an argument.
*/

function fill(n, obj){
    const baseSel = `capitalGains[${n}]`
    for (const key in obj) {
        const sel = `${baseSel}.${key}`;
        const el = document.getElementsByName(sel)[0];
        el.value = obj[key];
    }
}

function fillAll(objs) {
    for (const [i, obj] of objs.entries()) {
        fill(i, obj);
    }
}