How to Convert JSON to CSV for Excel and Spreadsheet Analysis

REST APIs, NoSQL databases, and webhook logs almost universally exchange data in JSON (JavaScript Object Notation). Finance teams, operations managers, and spreadsheet analysts, however, need flat rows and columns in CSV (Comma-Separated Values) to build pivot tables in Microsoft Excel or Google Sheets.

Because JSON is hierarchical (supporting nested objects and arrays) while CSV is strictly two-dimensional, converting JSON to CSV cleanly requires key flattening and proper delimiter escaping.

How Nested JSON Keys Are Flattened Into CSV Columns

Consider an array of customer records returned by an API:

[
  {
    "id": 101,
    "user": { "name": "Alice Verma", "role": "Admin" },
    "billing": { "city": "Mumbai, MH", "plan": "Pro" },
    "active": true
  },
  {
    "id": 102,
    "user": { "name": "Bob Nair", "role": "Editor" },
    "billing": { "city": "Bengaluru, KA", "plan": "Free" },
    "active": false
  }
]

If a naive script simply calls Object.values() on each top-level object, the user and billing columns end up containing useless [object Object] strings. A proper JSON-to-CSV converter traverses nested objects recursively and joins parent and child property names using dot notation:

RFC 4180 Escaping Rules That Prevent Broken Columns

Notice that billing.city in the example above contains a literal comma (Mumbai, MH). Under RFC 4180 (the standard specification for CSV files):

1. Fields Containing Commas or Newlines: Any string value containing the active delimiter (,) or a line break (\n) must be wrapped in double quotes: "Mumbai, MH".
2. Fields Containing Double Quotes: If a string value itself contains a double quote (e.g., 15" Laptop), the internal quote is escaped by doubling it ("15"" Laptop").
3. Heterogeneous Schemas: In NoSQL exports, Object #2 might include an optional key (couponCode) that was absent on Object #1. The converter must scan all records in the array first to build a complete superset of column headers so columns never shift out of alignment.

Step-by-Step: Converting JSON to CSV in EverySolve

1. Open the EverySolve JSON to CSV Converter. (If your JSON has syntax errors, validate it first in the JSON Formatter).
2. Paste your JSON array (or an object containing a records array) into the input editor, or upload a .json file.
3. Choose your preferred field delimiter (Comma , for standard US/UK spreadsheets, Semicolon ; for European regional Excel settings, or Tab \t for TSV).
4. Click Convert to preview the generated CSV and download the .csv file directly from browser memory. After exporting, you can also deduplicate or trim rows using the CSV Cleaner.