Dev Blog: Data Converters Every Developer Needs

Data format conversion is one of the most common tasks in software development. Whether you're working with APIs, configuration files, database exports, or scheduled tasks, you'll constantly need to transform data between formats like JSON, YAML, XML, CSV, and various numeric representations.

This guide covers the essential data converters that solve real problems in development workflows — from parsing cron expressions to converting Unix timestamps, transforming JSON to YAML, and working with different number bases.

JSON ↔ YAML Conversion

JSON and YAML are the two most common configuration formats in modern development. JSON is the default for APIs and JavaScript ecosystems, while YAML dominates in DevOps tools like Kubernetes, Docker Compose, Ansible, and GitHub Actions.

When You Need JSON to YAML

• Converting API responses to Kubernetes manifests or Helm values
• Migrating configuration from Node.js projects to Ansible playbooks
• Creating readable config files from JSON Schema definitions
• Transforming package.json data for CI/CD pipeline configs

When You Need YAML to JSON

• Sending YAML configs to REST APIs that expect JSON payloads
• Parsing Kubernetes manifests in JavaScript/TypeScript applications
• Converting GitHub Actions workflows for programmatic analysis
• Importing YAML data into JSON-based databases like MongoDB

The JSON ↔ YAML Converter handles bidirectional conversion with proper type preservation for strings, numbers, booleans, nulls, and nested structures.

XML ↔ JSON Conversion

XML remains prevalent in enterprise systems, SOAP APIs, RSS/Atom feeds, and legacy integrations. Converting between XML and JSON is essential when bridging modern and legacy systems.

Common XML to JSON Scenarios

• Consuming SOAP web services in modern REST-based applications
• Parsing RSS/Atom feeds for content aggregation
• Processing XML exports from enterprise systems (SAP, Oracle)
• Converting Maven pom.xml or .csproj files for tooling
• Transforming SVG metadata for programmatic manipulation

JSON to XML Use Cases

• Sending data to legacy SOAP services
• Generating XML sitemaps from JSON data sources
• Creating XML-based configuration files from JSON schemas
• Building XHTML content from JSON CMS data

The XML ↔ JSON Converter handles attribute mapping, text nodes, and nested element structures correctly.

JSON Array to CSV/TSV Export

When you need to analyze API data in a spreadsheet or import JSON records into a database, converting JSON to CSV is the standard approach.

Typical Use Cases

• Exporting API query results to Excel or Google Sheets for analysis
• Preparing JSON data for SQL COPY or LOAD DATA imports
• Converting MongoDB exports to CSV for data warehousing
• Transforming log aggregation results for reporting
• Creating TSV files for machine learning data pipelines

Structure Requirements

The input must be a JSON array of objects with consistent keys. The JSON Array to Table tool automatically detects columns and handles nested values by flattening or stringifying them.

// Input: JSON Array
[
  { "id": 1, "name": "Alice", "role": "admin" },
  { "id": 2, "name": "Bob", "role": "user" }
]

// Output: CSV
id,name,role
1,Alice,admin
2,Bob,user

Cron Expression Parser & Generator

Cron expressions define scheduled task timing in Unix-like systems, Kubernetes CronJobs, AWS CloudWatch Events, GitHub Actions, and countless other scheduling systems. Writing and debugging cron syntax without a cron expression generator or cron expression translator is error-prone.

Cron Expression Format

# Standard 5-field cron format
┌───────────── minute (0-59)
│ ┌───────────── hour (0-23)
│ │ ┌───────────── day of month (1-31)
│ │ │ ┌───────────── month (1-12)
│ │ │ │ ┌───────────── day of week (0-6, Sunday=0)
│ │ │ │ │
* * * * *

Common Cron Patterns

• 0 0 * * * — Daily at midnight
• */15 * * * * — Every 15 minutes
• 0 9 * * 1-5 — Weekdays at 9 AM
• 0 0 1 * * — First day of every month
• 0 */6 * * * — Every 6 hours

What the Parser Does

The Cron Expression Parser takes a cron expression and shows you the next scheduled execution dates. This helps you verify that your cron schedule behaves as expected before deploying to production — acting as both a cron validator and a cron to human readable translator.

Timestamp & Date Conversion

Working with timestamps is a constant in backend development. APIs return Unix timestamps, databases store different time formats, and debugging requires converting between epoch time and human-readable dates.

Unix Timestamp Formats

• Seconds (10 digits): 1734789600 — Standard Unix timestamp
• Milliseconds (13 digits): 1734789600000 — JavaScript Date.now()
• Microseconds (16 digits): 1734789600000000 — PostgreSQL, Python
• Nanoseconds (19 digits): 1734789600000000000 — Go, InfluxDB

Common Conversion Tasks

• Converting API timestamps to display dates in UI
• Debugging JWT exp and iat claims
• Comparing database timestamps across different systems
• Calculating time differences for logging and monitoring
• Converting between timezones for distributed systems

The Date Converter handles bidirectional conversion between Unix timestamps (seconds, milliseconds) and human-readable ISO 8601 dates.

Number Base Converter

Low-level programming, networking, and security work often requires converting between decimal, hexadecimal, binary, and octal number representations.

When You Need Base Conversion

• Hex to decimal: Reading memory addresses, color codes (#FF5733), MAC addresses
• Binary to decimal: Analyzing bit flags, permissions (chmod 755), IP subnets
• Decimal to hex: Writing byte sequences, debugging network protocols
• Octal to decimal: Unix file permissions (0644, 0755)

Practical Examples

# Color codes
#FF5733 → RGB(255, 87, 51)
Hex FF = Decimal 255

# File permissions
chmod 755 → Binary: 111 101 101
  Owner: rwx (7)
  Group: r-x (5)
  Other: r-x (5)

# IP networking
255.255.255.0 → Binary: 11111111.11111111.11111111.00000000
Subnet: /24 (24 ones)

The Number Base Converter supports conversion between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16).

Choosing the Right Converter

All Converters in DevToys Web Pro

These converters are part of the Converters collection in DevToys Web Pro. Each tool runs directly in your browser — no data is sent to external servers.

Open Converters →