Category

Code Tools

Format, validate, encode, decode, and inspect developer data without opening a heavy IDE or online account.

27 toolsNo signupBrowser-first

Format JSON, SQL, XML, GraphQL, HTML, and CSS

Use this category when you need a quick result without opening a heavy app or creating an account.

Decode JWTs, Base64, URLs, and HTML entities

Use this category when you need a quick result without opening a heavy app or creating an account.

Validate schemas and regex patterns while debugging

Use this category when you need a quick result without opening a heavy app or creating an account.

Recommended paths

Useful code workflows

Clean and validate structured data

Format JSON, YAML, TOML, and XML before pasting config or API payloads into another workflow.

JSON Formatter YAML Formatter / Validator TOML Formatter / Validator XML Formatter

Debug schemas, paths, and regular expressions

Validate JSON Schema rules, query JSON paths, and test regex patterns against real examples.

JSON Schema Validator JSON Path Tester Regex Tester Regex Generator

Convert data between transport formats

Move data between XML, JSON, YAML, CSV, TSV, and Markdown table formats without hand-editing.

XML to JSON Converter YAML to JSON Converter JSON to YAML Converter TSV to CSV Converter Markdown Table Generator

How to use this category

Start with one of the highlighted tools, paste or enter only the data needed for the task, then copy the result into your own workflow. Each tool page explains its assumptions and limits where they matter.

Privacy and quality note

Most tools in this category run in the browser and are designed for fast utility work without accounts, uploads, or dark patterns.

Start here

Popular code tools

Format, minify, and validate JSON. Catch errors instantly.

Decode JSON Web Tokens to inspect header, payload, and signature.

Directory

All code tools

Format, minify, and validate JSON. Catch errors instantly.

Decode JSON Web Tokens to inspect header, payload, and signature.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text.

URL Encoder / Decoder

Encode or decode URLs and query strings. Handle special characters.

HTML Entity Encoder

Encode or decode HTML entities. Prevent XSS, display special characters.

Test regular expressions with real-time matching and highlighting.

JSON Path Tester

Query JSON with simple dot/bracket paths and preview the extracted value.

String Escape / Unescape

Escape or unescape strings for JSON, JavaScript, HTML, URLs, and regex.

YAML to JSON Converter

Convert simple YAML into pretty-printed JSON in your browser.

JSON to YAML Converter

Convert JSON objects and arrays into readable YAML.

YAML Formatter / Validator

Format and lightly validate YAML configuration files in your browser.

TOML Formatter / Validator

Format and lightly validate TOML-style config files.

Config Format Converter

Convert JSON, YAML, and TOML config snippets on one browser-local page with subset warnings.

Format XML with indentation and basic parse-error detection.

XML to JSON Converter

Convert XML documents into readable JSON locally in your browser.

TSV to CSV Converter

Convert tab-separated values into properly quoted CSV.

CSV ↔ JSONL Converter

Convert CSV rows to JSONL records and JSONL back to CSV for agent datasets.

TypeScript to JSON Schema

Convert TypeScript interfaces into JSON Schema.

Schema Converter

Infer JSON Schema and convert JSON, YAML, and TypeScript schema shapes.

Markdown Table Generator

Generate clean Markdown tables from CSV, TSV, or pasted rows.

Format SQL queries with readable line breaks and indentation.

GraphQL Formatter

Format GraphQL queries, mutations, fragments, and selection sets.

Format HTML markup with indentation for nested tags.

Format CSS rules, declarations, media queries, and nested blocks.

JSON Schema Validator

Validate JSON data against a practical subset of JSON Schema.

Regex Generator

Generate regex patterns from positive and negative examples.

JWT Debugger + Editor

Decode JWT headers and claims, inspect expiry and issuer/audience signals, and copy a typed debug summary.

Code tools FAQ

Are code tools safe for secrets?

Most run locally in the browser, but avoid pasting secrets into any website unless you have verified the specific tool behavior.

Can agents use these tools too?

Many deterministic code transforms are good candidates for the Utilito API and MCP router.

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