Free & Open

FindUtils Tool API

A free, open REST API giving programmatic access to 50+ developer utilities. No API keys. No sign-up. Just HTTP.

View OpenAPI Spec Try the MCP Server

Tools

Free

No cost

Auth steps

Base URL

https://api.findutils.com/api

Quick Start

Make your first request in seconds. No setup required.

bash

# Encode text to Base64
curl -X POST https://api.findutils.com/api/tools/base64/execute \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello, World!", "action": "encode"}'

Available Tools

50 utilities available via the API, all free with no authentication.

Tool	Description	Endpoint
Base64 Encode / Decode	Encode or decode Base64 strings	`/api/tools/base64`
URL Encode / Decode	Percent-encode or decode URL components	`/api/tools/url-encode`
Morse Code	Encode/decode Morse code	`/api/tools/morse-code`
String Escape	Escape/unescape JSON, HTML, URL, regex	`/api/tools/string-escape`
Roman Numeral	Convert Roman numerals to/from Arabic	`/api/tools/roman-numeral`
Hash Generator	MD5, SHA-1, SHA-256, SHA-512	`/api/tools/hash`
HMAC Generator	HMAC with SHA-256, SHA-512	`/api/tools/hmac`
Password Generator	Cryptographically secure passwords	`/api/tools/password-generate`
Credit Card Validator	Luhn check + card type detection	`/api/tools/credit-card-validate`
JSON Formatter	Pretty-print or minify JSON	`/api/tools/json-format`
JSON Validator	Validate JSON and get error details	`/api/tools/json-validate`
JSON Flatten	Flatten nested JSON to dot-notation	`/api/tools/json-flatten`
JSON Unflatten	Unflatten dot-notation to nested JSON	`/api/tools/json-unflatten`
JSON Query	Query JSON with dot-notation paths	`/api/tools/json-query`
CSV to JSON	Convert CSV data to JSON array	`/api/tools/csv-to-json`
JSON to CSV	Convert JSON array to CSV format	`/api/tools/json-to-csv`
XML to JSON	Convert XML to JSON	`/api/tools/xml-to-json`
Word Counter	Words, characters, sentences, paragraphs	`/api/tools/word-count`
Case Converter	camelCase, snake_case, kebab-case, etc.	`/api/tools/case-convert`
Text Reverse	Reverse characters, words, or lines	`/api/tools/text-reverse`
Text Truncate	Truncate text with ellipsis	`/api/tools/text-truncate`
Text Repeat	Repeat text N times	`/api/tools/text-repeat`
Whitespace Cleaner	Trim, collapse spaces, remove blank lines	`/api/tools/whitespace-clean`
Line Sorter	Sort lines alphabetically or by length	`/api/tools/line-sort`
Line Deduplicator	Remove duplicate lines	`/api/tools/line-dedupe`
Slug Generator	Generate URL slugs from text	`/api/tools/slug-generate`
HTML Stripper	Strip HTML tags, return plain text	`/api/tools/html-strip`
Lorem Ipsum Generator	Generate placeholder text	`/api/tools/lorem-ipsum`
YAML to JSON	Convert YAML to JSON	`/api/tools/yaml-to-json`
Markdown to HTML	Convert Markdown to HTML	`/api/tools/markdown-to-html`
Cron Describe	Human-readable cron descriptions	`/api/tools/cron-describe`
Regex Tester	Test regular expressions against strings	`/api/tools/regex-test`
JWT Decoder	Decode and inspect JWT tokens	`/api/tools/jwt-decode`
IP Validator	Validate IPv4/IPv6, detect type	`/api/tools/ip-validate`
Email Validator	Validate email format	`/api/tools/email-validate`
Chmod Calculator	Numeric/symbolic chmod conversion	`/api/tools/chmod-calculate`
UUID Generator	Generate v4 UUIDs	`/api/tools/uuid`
Random Number	Secure random number generator	`/api/tools/random-number`
Random String	Random strings with configurable charset	`/api/tools/random-string`
QR Code (ASCII)	Generate QR code as ASCII art	`/api/tools/qr-text`
Percentage Calculator	Calculate percentage, increase, decrease	`/api/tools/percentage`
Unit Converter	Length, weight, temperature, and more	`/api/tools/unit-convert`
Color Converter	HEX, RGB, HSL conversions	`/api/tools/color-convert`
Number Base Converter	Binary, octal, decimal, hexadecimal	`/api/tools/number-base`
Date Difference	Calculate difference between two dates	`/api/tools/date-diff`
Unix Timestamp	Convert dates to/from Unix timestamps	`/api/tools/unix-timestamp`
CIDR Calculator	Network, broadcast, host range from CIDR	`/api/tools/cidr-calculate`
BMI Calculator	Calculate BMI from height and weight	`/api/tools/bmi-calculate`
Tip Calculator	Calculate tip and split between people	`/api/tools/tip-calculate`
Aspect Ratio	Calculate ratio and resize dimensions	`/api/tools/aspect-ratio`

Authentication

No authentication required.

The FindUtils API is free and open. No API key, no sign-up, no credit card. Just make HTTP requests and get results.

Rate Limits

Free tier: 60 requests per minute

Rate limits are per IP address. For higher limits, contact us.

Response Format

All endpoints return JSON with a consistent structure.

json

{
  "success": true,
  "result": {
    "result": "SGVsbG8sIFdvcmxkIQ=="
  },
  "meta": {
    "tool": "base64",
    "executionMs": 0
  }
}

More Examples

Copy and paste these into your terminal to try them out.

bash

# Generate a UUID
curl -X POST https://api.findutils.com/api/tools/uuid/execute \
  -H "Content-Type: application/json" -d '{}'

# SHA-256 hash
curl -X POST https://api.findutils.com/api/tools/hash/execute \
  -H "Content-Type: application/json" \
  -d '{"text": "hello world", "algorithm": "sha-256"}'

# Format JSON
curl -X POST https://api.findutils.com/api/tools/json-format/execute \
  -H "Content-Type: application/json" \
  -d '{"json": "{\"a\":1,\"b\":2}", "action": "format"}'

# Convert units
curl -X POST https://api.findutils.com/api/tools/unit-convert/execute \
  -H "Content-Type: application/json" \
  -d '{"value": 100, "from": "km", "to": "miles"}'

# List all available tools
curl https://api.findutils.com/api/tools

# Get OpenAPI spec
curl https://api.findutils.com/api/openapi.json

Error Handling

When a request fails, the API returns a structured error with an error code and message.

json

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Missing required field: text"
  }
}

HTTP Status	Error Code	Meaning
400	VALIDATION_ERROR	Invalid input (missing field, wrong type)
404	NOT_FOUND	Tool or endpoint not found
429	RATE_LIMITED	Too many requests (60/min limit)
500	INTERNAL_ERROR	Server error (try again)

API Endpoints

Five endpoints are available.

Method	Path	Description
GET	/api/health	Health check
GET	/api/tools	List all tools with schemas
GET	/api/tools/:id	Get single tool info + schema
POST	/api/tools/:id/execute	Execute a tool
GET	/api/openapi.json	OpenAPI 3.1 specification

OpenAPI Specification

The full API is documented as an OpenAPI 3.1 spec. Import it into Postman, Insomnia, or any compatible client.

Download openapi.json View in Swagger UI

Use Cases

What developers are building with the FindUtils API.

Build AI Agents

Give your LLM tool-use superpowers. Encode data, validate inputs, and transform formats directly from your agent loop.

Automate Workflows

Script repetitive tasks in CI/CD pipelines, shell scripts, or cron jobs. curl is all you need.

Integrate Into Apps

Embed developer utilities into your own product. Hash passwords on the fly, generate UUIDs, convert formats.

More Ways to Connect

FindUtils MCP Server

Connect all 52 tools directly to Claude, ChatGPT, or any MCP-compatible client. No HTTP calls needed.

Learn about MCP →

Use the Web UI

Prefer a visual interface? Every tool is also available as a free web app with no sign-in required.

Browse all tools →