jsonweaver
Version:
A simple utility to transform JSON data into CSV, XML, YAML, JSONLines and Markdown table formats.
64 lines (63 loc) • 2.11 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.toCSV = exports.customCSVFieldGenerator = void 0;
const defaultCSVFieldGenerator = (Json) => {
const allKeys = Array.from(new Set(Json.flatMap(item => Object.keys(item))));
return allKeys.map(key => ({
label: key,
value: key
}));
};
const customCSVFieldGenerator = (headerMapping) => {
return () => {
return Object.keys(headerMapping).map(key => ({
label: headerMapping[key],
value: key
}));
};
};
exports.customCSVFieldGenerator = customCSVFieldGenerator;
const flattenObject = (obj, prefix = '') => {
return Object.entries(obj).reduce((acc, [key, value]) => {
const newKey = prefix ? `${prefix}.${key}` : key;
if (value && typeof value === 'object' && !Array.isArray(value)) {
Object.assign(acc, flattenObject(value, newKey));
}
else {
acc[newKey] = value;
}
return acc;
}, {});
};
const flattenJson = (Json) => {
return Json.map((item) => flattenObject(item));
};
const toCSV = (Json, fieldGenerator = defaultCSVFieldGenerator) => {
if (Json.length === 0)
return '';
const flattenedJson = flattenJson(Json);
const allObjectsEmpty = flattenedJson.every(item => Object.keys(item).length === 0);
if (allObjectsEmpty)
return '';
const fields = fieldGenerator(flattenedJson);
const headers = fields.map(field => `"${field.label}"`).join(',');
const rows = flattenedJson.map((row) => fields
.map((field) => {
const value = row[field.value];
if (value === null || value === undefined) {
return '';
}
else if (typeof value === 'string') {
return `"${value.replace(/"/g, '""')}"`;
}
else if (typeof value === 'number') {
return `${value}`;
}
else {
return `"${String(value).replace(/"/g, '""')}"`;
}
})
.join(','));
return [headers, ...rows].join('\n');
};
exports.toCSV = toCSV;