Developer Tools for JSON, Code, Requests, and Reference Tasks

Choose a developer tool by its input and required output. FindUtils provides formatters, converters, reference tools, and network checks. This article groups them by workflow so you can select a tool and verify its result.

JSON Tools: Format, Validate, Convert, and Transform

FindUtils groups JSON tools by formatting, inspection, generation, and conversion. Choose the operation that matches your input.

Format and Validate

The JSON Formatter pretty-prints minified JSON with syntax highlighting, error detection, and configurable indentation (2 or 4 spaces). It handles files up to 10MB — larger than most online formatters. The JSON Minifier does the reverse, stripping whitespace for production payloads.

The JSON Schema Validator checks JSON documents against a schema definition, and the JSON Schema Generator creates schemas from sample JSON — saving hours of manual schema writing.

Compare and Inspect

The JSON Diff highlights differences between two JSON documents with a side-by-side diff view. The JSON Comparer does structural comparison. The JSON Visualizer renders JSON as an interactive tree, and the JSON Path Finder lets you click any node to get its JSONPath expression — far faster than manually tracing nested objects.

The jq Playground provides an in-browser filter playground. Check its supported syntax before using a filter with a full jq installation.

Generate and Mock

The JSON Faker generates realistic fake data matching your schema — names, emails, addresses, dates, UUIDs. The Mock JSON Generator creates structured sample data for frontend development and API prototyping. Both eliminate the need for third-party fake data APIs.

Convert JSON to Code

FindUtils converts JSON to typed code for every major language:

Tool	Output
JSON to TypeScript	TypeScript interfaces
JSON to Zod Schema	Zod validation schemas
JSON to Go Struct	Go struct definitions
JSON to Java Class	Java POJOs
JSON to Python Class	Python dataclasses
JSON to XML	XML documents
JSON to CSV	CSV spreadsheet data
JSON to URL Params	Query string parameters

Treat generated types as a starting point. Include samples with nulls, missing keys, and arrays, then review the inferred structure.

Convert to JSON

Tool	Input
CSV to JSON	CSV files
URL Params to JSON	Query strings
HTML Table to JSON	HTML tables
YAML to JSON	YAML files
XML to JSON	XML documents

JSON Form Builders

For frontend developers, FindUtils converts JSON schemas into working form components:

JSON to React Form — React components with validation
JSON to Tailwind Form — Tailwind CSS styled forms
JSON to Bootstrap Form — Bootstrap form components
JSON to HTML Form — Plain HTML forms
Form to JSON Schema — Reverse: form definition to schema

Code Formatters and Minifiers

Messy code from API responses, minified production bundles, or legacy codebases — these formatters clean it up instantly:

HTML Formatter — Indent and beautify HTML with configurable options
XML Formatter — Format XML with proper indentation
SQL Formatter — Beautify SQL queries for readability and debugging
CSS Minifier — Strip whitespace and comments from CSS
Markdown Previewer — Live preview of Markdown with GitHub-flavored syntax
YAML Validator — Validate YAML syntax and structure

Encoding, Decoding, and Conversion

Every developer needs these utilities multiple times per week:

Base64 Encoder — Encode and decode Base64 strings
URL Encoder/Decoder — Handle percent-encoding for URLs
Unix Timestamp Converter — Convert between epoch timestamps and human-readable dates
UUID Generator — Generate v4 UUIDs in bulk
JSON Escaper — Escape and unescape JSON strings
Number Base Converter — Convert between binary, octal, decimal, and hex
Image to Base64 — Convert images to data URIs for embedding

Regex Testing

The Regex Tester evaluates JavaScript regular expressions. Regex syntax differs between runtimes. Test the final pattern in the runtime that will use it.

The Glob Pattern Tester validates file matching patterns — useful for .gitignore files, build configs, and CI/CD pipelines.

API and Web Development

API Tools

The cURL to Code converter transforms cURL commands into working code for Python, JavaScript, Go, PHP, and more. The Postman to cURL and HAR to cURL converters go the other direction — extract cURL commands from Postman collections or browser network captures.

The API Docs Generator creates documentation from your API definitions. The OpenAPI Validator checks your OpenAPI/Swagger specs for errors, and Swagger to OpenAPI converts Swagger 2.0 to OpenAPI 3.0.

For GraphQL developers: the GraphQL Schema Validator validates schema definitions, and GraphQL to TypeScript generates TypeScript types from GraphQL schemas.

SEO and Web Standards

Meta Tag Generator — Generate complete meta tags for SEO
Schema.org Generator API — Create structured data markup (JSON-LD)
JSON-LD Generator — Build JSON-LD structured data
Robots.txt Generator — Create and validate robots.txt files

Reference Tools

HTTP Status Code Lookup — Searchable reference for all HTTP status codes
MIME Type Finder — Look up MIME types by file extension
HTML Entity Finder — Search 248 HTML entities with copy-to-clipboard
Cron Expression Generator — Build and validate cron schedules visually
chmod Calculator — Calculate Unix file permissions

Security and Authentication Tools

Security testing and token debugging without installing specialized software:

JWT (JSON Web Tokens)

The JWT Decoder parses JWT tokens and displays the header, payload, and signature. The JWT Generator creates signed tokens for testing. The JWT Security Validator checks tokens for common vulnerabilities — weak algorithms, missing expiration, insecure claims.

Hashing and Encryption

SHA-256 Hash Generator — Generate SHA-256 hashes
HMAC Generator — Create HMAC signatures for API authentication
File Hash Calculator — Verify file integrity with MD5, SHA-1, SHA-256
Random Key Generator — Generate cryptographic keys and secrets
Text Encryption — AES encrypt/decrypt text
PGP Encryption Tool — PGP encrypt and decrypt messages

Password Security

Password Generator — Generate strong random passwords
Password Strength Checker — Evaluate password strength with entropy calculation
Password Breach Checker — Check if a password appears in known data breaches (using k-anonymity — only a hash prefix is sent, never the full password)

Infrastructure Security

SSL Certificate Checker — Inspect SSL/TLS certificates for expiration and configuration
Security Headers Analyzer — Audit HTTP security headers (CSP, HSTS, X-Frame-Options)
DNS Lookup — Query DNS records (A, AAAA, MX, CNAME, TXT)
DNS Security Scanner — Check DNSSEC and DNS security configuration
IP Address Lookup — Geolocation and ISP information

Validation

Email Validator — Verify email format and domain
Phone Number Validator — Validate international phone numbers
URL Safety Checker — Check URLs against known threat databases

When a browser utility fits

Task	Tool role	Review before use
Format a sample	JSON or code formatter	Syntax, dialect, and supported size
Generate types	Schema or type converter	Optional fields, unions, and unseen values
Convert a request	cURL or collection converter	Headers, body, variables, and secrets
Inspect a token	JWT decoder	Decoding differs from signature verification
Check a domain	Network lookup	The operation sends a target to a remote service

Project Management Tools for Dev Teams

FindUtils includes tools built specifically for agile development workflows:

Sprint Capacity Calculator — Plan sprint capacity based on team availability
Story Point Poker — Estimate story points collaboratively
Dev Request Prioritizer — Prioritize feature requests and bug reports
Scoping Creep Tracker — Monitor scope changes during a project
Tech Debt Register — Track and prioritize technical debt
Retro Meeting — Run sprint retrospectives with structured templates

Text Processing for Developers

Diff Checker — Compare two text blocks with highlighted differences
Duplicate Line Remover — Remove duplicate lines from logs, configs, or data
Text Line Sorter — Sort lines alphabetically, numerically, or reverse
Data Sanitizer — Clean and normalize messy data
HTML to Markdown — Convert HTML pages to clean Markdown

Tools Used in This Guide

JSON Formatter — Pretty-print and validate JSON with syntax highlighting
Regex Tester — Test JavaScript regex patterns with real-time highlighting
JWT Decoder — Parse and inspect JWT token headers and payloads
Base64 Encoder — Encode and decode Base64 strings
SQL Formatter — Beautify SQL queries for readability
cURL to Code — Convert cURL commands to Python, JavaScript, Go, PHP
JSON to TypeScript — Generate TypeScript interfaces from JSON
Password Generator — Generate cryptographically strong passwords
SSL Certificate Checker — Inspect SSL/TLS certificate configuration
Code Screenshot Generator — Create beautiful code screenshots

FAQ

Q1: Can a converter replace an API client? A: It can translate a request. Collections, scripts, environments, authentication, and repeated tests need their own workflow.

Q2: Can a JWT decoder prove that a token is valid? A: No. Verify the signature and required claims with the receiving application’s rules.

Q3: Does generated TypeScript validate runtime data? A: No. Types describe expected structure. Use runtime validation where the data crosses an untrusted boundary.

Q4: Should I paste a production token? A: Use a redacted or expired example. Use approved local tools when real credentials are necessary.

Q5: Does every tool operate offline? A: No. Network checks need remote access, and browser tools may load supporting resources.

Q6: Does the jq playground implement every jq feature? A: Check the playground’s supported subset. Test production filters with the jq version that will run them.