Choose a focused tool from this category, test representative input, and review the generated result before continuing your workflow.
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Developer
ONLINE
Free Online Developer Tools
Format, validate, inspect, convert, and generate code, APIs, and structured data directly in your browser.
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AI Token Counter
Estimate AI prompt tokens with a transparent English, code, or multilingual heuristic, including a planning range, characters, UTF-8 bytes, words, and detected content profile.
CSS Beautifier
Use CSS Beautifier to format compressed or inconsistent CSS online with readable indentation, line breaks, declarations, selectors, comments, and nested blocks.
CSS Minifier
Minify CSS by removing unnecessary spaces and comments for smaller stylesheets, cleaner delivery, and deployment workflows
CSV to JSON
Convert UTF-8 CSV, TSV, semicolon or pipe-delimited rows to a formatted JSON array with header controls, delimiter detection and empty-value handling.
Content-Type Parser
Parse a Content-Type header into its media type, charset, boundary, and other parameters.
Cookie Parser
Parse a Cookie request header into readable cookie names and values.
Cron Expression Parser
Split a standard five-field cron expression into minute, hour, day-of-month, month, and weekday explanations.
GraphQL Formatter
GraphQL Formatter turns compressed GraphQL queries, mutations, fragments, and variables into readable structured output for faster review, debugging, and team collaboration.
GraphQL Minifier
GraphQL Minifier removes unnecessary whitespace and comments from GraphQL queries while preserving operations, fragments, variables, directives, and string values.
HTML Beautifier
Format compact or inconsistent HTML with readable indentation, line breaks, nested elements, comments, and document structure.
HTML Minifier
Minify HTML by removing unnecessary whitespace and comments for smaller markup, faster transfer, and deployment preparation
HTML Tag Remover
Remove HTML tags from markup while keeping readable text for cleanup, migration, extraction, and content preparation
HTTP Authorization Header Parser
Inspect HTTP Authorization headers and identify Bearer, Basic, and other authentication schemes.
JSON Formatter
Format, beautify or minify JSON online with 2-space, 4-space or tab indentation, optional recursive key sorting, validation, and copy-ready output.
JSON Lines Formatter
Validate and normalize JSON Lines or JSONL data as one compact JSON value per line, with strict blank-record detection and an optional final newline.
JSON Minifier
Minify formatted JSON into a compact single-line representation for APIs, storage, testing, and data transfer.
JSON Path Finder
Find JSONPath-style locations for matching keys or values inside deeply nested JSON without manually tracing the structure.
JSON Pointer Tester
Resolve an RFC 6901 JSON Pointer against an object or array, including escaped slash and tilde characters, and inspect the selected value.
JSON Sorter
Use this free JSON Sorter to alphabetize object keys recursively while preserving values, nested structures, and array order online.
JSON Viewer
View JSON online as a readable tree, pretty-printed document, or flattened JSON path list with value types and depth controls.
JavaScript Beautifier
Use JavaScript Beautifier to format compact JavaScript online with readable indentation, braces, statements, operators, comments, strings, and template literals.
JavaScript Minifier
Use JavaScript Minifier to remove comments and unnecessary whitespace from JavaScript online while preserving strings, template literals, identifiers, and operators.
Regex Extractor
Extract all regex matches and capture groups from text.
Regex Match Highlighter
Highlight every regex match directly inside source text so patterns can be reviewed visually before they are reused.
Regex Replace
Replace regex matches with text or capture-group references.
Regex Splitter
Split text with a regular expression and return clean copyable segments without manually editing repeated delimiters.
Regex Tester PRO
Test regular expressions with detailed matches, named groups, offsets, line and column positions, execution timing, and highlighted previews.
SQL Beautifier
Format SQL queries with readable clauses, indentation, line breaks, joins, conditions, grouping, and ordering.
SQL Formatter
Format SQL statements with clearer indentation and line breaks for review, debugging, documentation, and database development.
SQL Minifier
Compress SQL queries by removing comments and unnecessary whitespace while keeping statements easy to copy and deploy.
Set-Cookie Parser
Parse a Set-Cookie response header into its cookie value, scope, expiry, and security attributes.
XML Formatter
Format and indent XML for easier inspection, debugging, configuration review, data exchange, and development workflows
XML Minifier
XML Minifier removes indentation, line breaks, and optional comments from valid XML to create a compact document while preserving the XML structure.
XPath Tester
Evaluate XPath 1.0 expressions against XML and inspect matched nodes or typed string, number, and boolean results.
YAML Formatter
Format and indent YAML data.
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About this category
What you can do with Developer tools
Trexmi developer tools cover focused coding and data tasks without requiring a local setup. Format and validate structured data, test regular expressions, inspect API-related values, generate reusable output, and handle common development utilities from one browser-based workspace.
Developer tools help you complete focused browser-based tasks without installing a separate application or building a complicated workflow. Choose the utility that matches the job, provide the required input, review the output, and continue working immediately.
This directory brings together 35 currently available developer tools in one place. Use the live search and sorting controls to compare utilities by name, purpose, popularity, or recent updates, then open the most relevant option directly from the grid.
The collection is useful for quick one-off work as well as repeatable professional tasks. Clear descriptions explain what each developer tool does before you open it, helping you avoid unnecessary steps and choose a more efficient workflow.
Common workflows
01Format and inspect JSON, XML, YAML, and CSV
02Test regex and code-related input
03Build and review API data
04Generate schemas, keys, and developer assets
05Validate structured data before using it in a project
Popular ways to use Developer tools
Choose a focused tool from this category, test representative input, and review the generated result before continuing your workflow.
Choose a focused tool from this category, test representative input, and review the generated result before continuing your workflow.
Choose a focused tool from this category, test representative input, and review the generated result before continuing your workflow.
Choose a focused tool from this category, test representative input, and review the generated result before continuing your workflow.
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Useful answers
Questions people ask before using the tools
Clear answers about access, limits, privacy, and choosing the right workflow.
What are developer tools?
Developer tools are focused browser utilities that help complete a specific task without installing a desktop application or building a custom workflow.
Are Trexmi developer tools free?
Most tools can be opened and tested for free. Account and PRO limits apply only where a larger workload or additional usage allowance is required.
Do developer tools upload my data?
Each tool explains its processing model on the page. Browser-based tools process locally where possible, while server processors use the submitted input only to produce the requested result.
How do I choose the right developer tool?
Start with the exact output you need, compare the descriptions in the directory, then test the most relevant tool with representative input before using the result in production.
Can I use these tools for professional work?
Yes. They are designed for repeatable development, content, data, QA, office, and technical workflows, but important output should still be reviewed before production use.
Will more developer tools be added?
Yes. Trexmi expands existing categories as new focused workflows are implemented and tested.