---
type: Guide
title: "Quick developer utilities"
description: "Format JSON, clean CSV, hash text, make QR codes and diagrams — in the browser."
resource: https://localpapa.com/
tags: [guide, developer, json, csv, hash, qr]
timestamp: 2026-06-21T00:00:00Z
---

# Quick developer utilities

Small, everyday helpers that run locally — handy when you don't want to paste data into a
random online service.

## By goal

- **Pretty-print / validate JSON** → [JSON Formatter](../tools/json-formatter.md)
- **Clean, convert or inspect CSV** → [CSV Helper](../tools/csv-helper.md)
- **Compute MD5 / SHA hashes** → [Hash Generator](../tools/hash-generator.md)
- **Generate a QR code** → [QR Generator](../tools/qr-generator.md) (and [scan one](../tools/qr-scanner.md))
- **Draw flowcharts from text** → [Mermaid Editor](../tools/mermaid-editor.md)

## Why local matters here

Config files, tokens and customer CSVs are exactly the data you should not paste into an
unknown server. These tools keep everything in the browser tab.

## Related guides

- [Share files without leaking private data](./protect-privacy.md)
- [Work with PDF files](./work-with-pdfs.md)

---
*[All task guides](./index.md) · [Developer tools category](../categories/developer.md) · [Knowledge pack root](../index.md)*