Free tools

Lightweight utilities
for everyday workflows.

Helpful browser-based tools from MainStem. No signup required, just quick utilities for cleaning up data, converting files, and moving faster.

Open JSON viewer →
Available now

Free tools

Clean up JSON, inspect nested data, and convert between JSON and CSV in your browser.

JSON viewer

Paste JSON, format it, and inspect nested objects or arrays in a collapsible tree view.

  • Format and validate JSON
  • Browse nested values
  • Runs locally in your browser
Open JSON viewer →

JSON to CSV

Paste or upload JSON and export arrays or objects into spreadsheet-ready CSV.

  • Upload or paste JSON
  • Escapes CSV values automatically
  • Download the converted CSV
Convert JSON to CSV →

CSV to JSON

Paste or upload CSV and turn rows into formatted JSON objects using the header row.

  • Handles quoted CSV fields
  • Formats readable JSON output
  • Download the converted JSON
Convert CSV to JSON →