5 files changed, 197 insertions, 0 deletions
diff --git a/src/tools/json-to-csv/index.ts b/src/tools/json-to-csv/index.ts
new file mode 100644
index 0000000..acfef02
--- /dev/null
+++ b/src/tools/json-to-csv/index.ts
@@ -0,0 +1,12 @@
+import { List } from '@vicons/tabler';
+import { defineTool } from '../tool';
+
+export const tool = defineTool({
+  name: 'JSON to CSV',
+  path: '/json-to-csv',
+  description: 'Convert JSON to CSV with automatic header detection.',
+  keywords: ['json', 'to', 'csv', 'convert'],
+  component: () => import('./json-to-csv.vue'),
+  icon: List,
+  createdAt: new Date('2023-06-18'),
+});
diff --git a/src/tools/json-to-csv/json-to-csv.e2e.spec.ts b/src/tools/json-to-csv/json-to-csv.e2e.spec.ts
new file mode 100644
index 0000000..840469c
--- /dev/null
+++ b/src/tools/json-to-csv/json-to-csv.e2e.spec.ts
@@ -0,0 +1,29 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('Tool - JSON to CSV', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/json-to-csv');
+  });
+
+  test('Has correct title', async ({ page }) => {
+    await expect(page).toHaveTitle('JSON to CSV - IT Tools');
+  });
+
+  test('Provided json is converted to csv', async ({ page }) => {
+    await page.getByTestId('input').fill(`
+[
+  {'Age': 18.0, 'Salary': 20000.0, 'Gender': 'Male', 'Country': 'Germany', 'Purchased': 'N'},
+  {'Age': 19.0, 'Salary': 22000.0, 'Gender': 'Female', 'Country': 'France', 'Purchased': 'N'},
+]
+    `);
+
+    const generatedJson = await page.getByTestId('area-content').innerText();
+
+    expect(generatedJson.trim()).toEqual(`
+Age,Salary,Gender,Country,Purchased
+18,20000,Male,Germany,N
+19,22000,Female,France,N
+   `.trim(),
+    );
+  });
+});
diff --git a/src/tools/json-to-csv/json-to-csv.service.test.ts b/src/tools/json-to-csv/json-to-csv.service.test.ts
new file mode 100644
index 0000000..c27bf9b
--- /dev/null
+++ b/src/tools/json-to-csv/json-to-csv.service.test.ts
@@ -0,0 +1,89 @@
+import { describe, expect, it } from 'vitest';
+import { convertArrayToCsv, getHeaders } from './json-to-csv.service';
+
+describe('json-to-csv service', () => {
+  describe('getHeaders', () => {
+    it('extracts all the keys from the array of objects', () => {
+      expect(getHeaders({ array: [{ a: 1, b: 2 }, { a: 3, c: 4 }] })).toEqual(['a', 'b', 'c']);
+    });
+
+    it('returns an empty array if the array is empty', () => {
+      expect(getHeaders({ array: [] })).toEqual([]);
+    });
+  });
+
+  describe('convertArrayToCsv', () => {
+    it('converts an array of objects to a CSV string', () => {
+      const array = [
+        { a: 1, b: 2 },
+        { a: 3, b: 4 },
+
+      ];
+
+      expect(convertArrayToCsv({ array })).toMatchInlineSnapshot(`
+        "a,b
+        1,2
+        3,4"
+      `);
+    });
+
+    it('converts an array of objects with different keys to a CSV string', () => {
+      const array = [
+        { a: 1, b: 2 },
+        { a: 3, c: 4 },
+      ];
+
+      expect(convertArrayToCsv({ array })).toMatchInlineSnapshot(`
+        "a,b,c
+        1,2,
+        3,,4"
+      `);
+    });
+
+    it('when a value is null, it is converted to the string "null"', () => {
+      const array = [
+        { a: null, b: 2 },
+      ];
+
+      expect(convertArrayToCsv({ array })).toMatchInlineSnapshot(`
+        "a,b
+        null,2"
+      `);
+    });
+
+    it('when a value is undefined, it is converted to an empty string', () => {
+      const array = [
+        { a: undefined, b: 2 },
+        { b: 3 },
+      ];
+
+      expect(convertArrayToCsv({ array })).toMatchInlineSnapshot(`
+        "a,b
+        ,2
+        ,3"
+      `);
+    });
+
+    it('when a value contains a comma, it is wrapped in double quotes', () => {
+      const array = [
+        { a: 'hello, world', b: 2 },
+      ];
+
+      expect(convertArrayToCsv({ array })).toMatchInlineSnapshot(`
+        "a,b
+        \\"hello, world\\",2"
+      `);
+    });
+
+    it('when a value contains a double quote, it is escaped with another double quote', () => {
+      const array = [
+        { a: 'hello "world"', b: 2 },
+      ];
+
+      expect(convertArrayToCsv({ array })).toMatchInlineSnapshot(`
+        "a,b
+        hello \\\\\\"world\\\\\\",2"
+      `);
+    });
+  });
+});
diff --git a/src/tools/json-to-csv/json-to-csv.service.ts b/src/tools/json-to-csv/json-to-csv.service.ts
new file mode 100644
index 0000000..ab3c04e
--- /dev/null
+++ b/src/tools/json-to-csv/json-to-csv.service.ts
@@ -0,0 +1,35 @@
+export { getHeaders, convertArrayToCsv };
+
+function getHeaders({ array }: { array: Record<string, unknown>[] }): string[] {
+  const headers = new Set<string>();
+
+  array.forEach(item => Object.keys(item).forEach(key => headers.add(key)));
+
+  return Array.from(headers);
+}
+
+function serializeValue(value: unknown): string {
+  if (value === null) {
+    return 'null';
+  }
+
+  if (value === undefined) {
+    return '';
+  }
+
+  const valueAsString = String(value).replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/"/g, '\\"');
+
+  if (valueAsString.includes(',')) {
+    return `"${valueAsString}"`;
+  }
+
+  return valueAsString;
+}
+
+function convertArrayToCsv({ array }: { array: Record<string, unknown>[] }): string {
+  const headers = getHeaders({ array });
+
+  const rows = array.map(item => headers.map(header => serializeValue(item[header])));
+
+  return [headers.join(','), ...rows].join('\n');
+}
diff --git a/src/tools/json-to-csv/json-to-csv.vue b/src/tools/json-to-csv/json-to-csv.vue
new file mode 100644
index 0000000..cf15400
--- /dev/null
+++ b/src/tools/json-to-csv/json-to-csv.vue
@@ -0,0 +1,32 @@
+<script setup lang="ts">
+import JSON5 from 'json5';
+import { convertArrayToCsv } from './json-to-csv.service';
+import type { UseValidationRule } from '@/composable/validation';
+import { withDefaultOnError } from '@/utils/defaults';
+
+function transformer(value: string) {
+  return withDefaultOnError(() => {
+    if (value === '') {
+      return '';
+    }
+    return convertArrayToCsv({ array: JSON5.parse(value) });
+  }, '');
+}
+
+const rules: UseValidationRule<string>[] = [
+  {
+    validator: (v: string) => v === '' || JSON5.parse(v),
+    message: 'Provided JSON is not valid.',
+  },
+];
+</script>
+
+<template>
+  <format-transformer
+    input-label="Your raw json"
+    input-placeholder="Paste your raw json here..."
+    output-label="CSV version of your JSON"
+    :input-validation-rules="rules"
+    :transformer="transformer"
+  />
+</template>