Dev Tools for Backend Developers
Backend developers work with structured data, APIs, databases, authentication, and scheduled tasks across a wide range of languages and frameworks. Whether you are debugging a JWT token, formatting a complex SQL query, generating test data, parsing a cron expression, or validating JSON from an external API, having reliable browser-based tools at hand saves significant context-switching time. This collection is curated for the everyday backend development workflow.
Pretty-print and format JSON with proper indentation.
Check if your JSON is valid and find syntax errors.
Compare two JSON objects and highlight added, removed, and changed keys.
Convert JSON to YAML format with proper indentation.
Format and beautify YAML with consistent indentation (2 or 4 spaces).
Validate YAML syntax and preview the parsed JSON representation.
Format and beautify SQL queries with proper indentation and uppercase keywords.
Convert tab- or pipe-separated SQL CLI output into clean CSV format.
Convert CSV data to a JSON array of objects.
Test regular expressions against text with real-time match highlighting.
Generate SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic hashes from any text.
Generate HMAC-SHA-256/384/512 message authentication codes using a secret key.
Decode and inspect JSON Web Token header and payload.
Build and sign JWTs with HS256 using the Web Crypto API.
Parse cron expressions and see next execution times in plain English.
Convert Unix timestamps to human-readable dates and vice versa.
Generate random UUIDs (v4) for use as unique identifiers.
Generate rows of realistic fake data with configurable columns.
Encode text or binary data to Base64 format.
Decode Base64-encoded strings back to readable text.
Build cURL commands visually with URL, method, headers, body, and auth.
Searchable reference of all HTTP status codes with descriptions.
FAQ
- How do I quickly check what a JWT contains?
- Use the JWT Decoder to paste any JWT and instantly see the header algorithm, payload claims (user ID, roles, expiry), and verify the structure. The tool shows the decoded payload alongside the raw base64url components.
- What is the fastest way to generate realistic test data?
- The Fake Data Generator creates realistic user profiles, addresses, emails, and custom data sets that you can export as JSON or CSV. The JSON Data Generator lets you define a custom schema with types and constraints for more specific test fixtures.
- How do I convert a cron expression to human-readable form?
- Paste any cron expression into the Cron Parser and it translates it to plain English, shows the next 10 scheduled run times, and validates the expression. The Crontab Generator helps you build new expressions from natural language descriptions.