Top Dev Tools APIs on API.market

Browse our collection of high-quality Dev Tools APIs

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Code & formatting
5.0(4)

Free, Effortless Image & Video Upload and Retrieval Service

1.1K•625.3K
1M FREE API units
Code & formatting
0.0(0)

Generate unique, stylized character avatars from text prompts in seconds with Tencent's Instant Character AI model—ideal for games, media, and apps.

6•0
$0.05 per API unit
Code & formatting
0.0(0)

Expand images beyond their borders in high resolution—generate new pixels for flawless, seamless resizing in seconds with licensed commercial-safe AI.

3•6
$0.05 per API unit
URL & QR utilities
0.0(0)

Turn any text or link into a crisp SVG QR code with your own size, colors, margin and error correction level, as an image or JSON.

1•2
$5/month
URL & QR utilities
0.0(0)

Check any link's HTTP status, full redirect chain, final URL, server and response time, and batch up to 20 URLs in one POST request.

1•3
$5/month
URL & QR utilities
0.0(0)

Expand bit.ly, t.co, TinyURL and any redirecting link to its final destination, with every hop of the redirect chain and the final HTTP status.

1•2
$5/month
URL & QR utilities
0.0(0)

Generate scannable Code 128 and EAN-13 barcodes as SVG with an automatic EAN check digit, custom bar height, bar width and an optional text line.

1•2
$5/month
Parsing & extraction
0.0(0)

Turn the HTML tables on any web page into JSON rows, JSON objects keyed by header, or CSV, with the page's table count and captions.

1•2
$5/month
Parsing & extraction
0.0(0)

Parse any User-Agent string into browser and version, operating system and version, device type, rendering engine and a bot flag.

1•2
$5/month
Parsing & extraction
0.0(0)

Get the current time or any date in an IANA time zone with UTC offset, weekday and Unix time, and convert one moment into many zones at once.

1•2
$5/month
Code & formatting
0.0(0)

Convert GitHub-flavored Markdown with tables, lists and code blocks into safe HTML, with scripts and inline event handlers stripped by default.

1•2
$5/month
Code & formatting
0.0(0)

Convert JSON arrays to CSV with nested objects flattened, and CSV to JSON with automatic delimiter detection, quoted fields and numbers.

1•3
$5/month
Code & formatting
0.0(0)

Convert XML to JSON with attributes kept, JSON to XML, YAML to JSON and JSON to YAML. POST the document and get the converted result back.

1•5
$5/month
Code & formatting
0.0(0)

Convert between 300+ units of length, weight, volume, temperature, speed, data and more, and safely evaluate math expressions in one API.

1•3
$5/month
Code & formatting
0.0(0)

Generate lightweight SVG placeholder images at any width and height with your own background color, text color and label, for mockups and prototypes.

1•2
$5/month
Code & formatting
0.0(0)

Convert a color between HEX, RGB, HSL and CMYK, get palettes, shades and tints, the best text color and the WCAG contrast ratio with a second color.

1•2
$5/month
Document & PDF tools
0.0(0)

Turn JSON with line items, quantities, prices and tax into a PDF invoice, or make a simple PDF from text. Get the PDF file or a Base64 string.

1•2
$5/month
Code & formatting
0.0(0)

Generate lorem ipsum paragraphs, sentences, words, list items or titles as JSON, plain text or HTML, with seeded output for repeatable tests.

1•2
$5/month
Code & formatting
0.0(0)

Generate realistic fake users, addresses, companies, products, posts and transactions in 6 languages, or rows from your own JSON schema.

1•9
$5/month
Code & formatting
0.0(0)

Hash text with MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 in one call, sign messages with HMAC and identify which algorithm made a hash.

1•4
$5/month
Parsing & extraction
0.0(0)

Convert dates between 13 calendars such as Hijri, Hebrew, Persian and Chinese, and get Islamic, Jewish, Chinese and Persian holidays, 1900 to 2100.

1•5
$5/month
Parsing & extraction
0.0(0)

Convert numbers and money amounts to words in English, Spanish, French, German, Portuguese and Italian for cheques, invoices and contracts.

1•2
$5/month
URL & QR utilities
0.0(0)

Generate SVG initials avatars from any name with deterministic colors, circle, rounded or square shapes, custom sizes and a JSON data URI option.

1•2
$5/month
Parsing & extraction
0.0(0)

Validate a domain's security.txt for Contact, Expires, syntax and expiry, with coded issues as JSON. ads.txt is checked too.

1•2
500 FREE API units
Parsing & extraction
0.0(0)

Check the cookies a URL sets for missing Secure, HttpOnly and SameSite flags and RFC violations, with coded issues and a grade.

1•3
$9/month
Parsing & extraction
0.0(0)

SEO checker API and technical SEO audit API for one URL: indexability verdict and score, robots, canonical, meta tags, headings, hreflang and sitemap.

3•6
50 FREE API units
Parsing & extraction
0.0(0)

Check any URL's Cache-Control, Expires and ETag headers and get a cacheability verdict, freshness lifetime and misconfiguration list as JSON.

1•14
500 FREE API units
URL & QR utilities
0.0(0)

Preflight endpoints, verify search results and rank award-flight options with deterministic JSON responses.

By ayl
3•10
50 FREE API units
developer-tools
0.0(0)

Blake2B/MD5/SHA Text/File/Bytes Hashing

2•11
5 FREE API units
Code & formatting
0.0(0)

Recover readable source from obfuscated JavaScript. Decrypts string arrays, folds constants, removes dead code — via AST, no execution of untrusted code.

1•24
30 FREE API units
Parsing & extraction
0.0(0)

Harmonize incompatible Parquet schemas automatically—free for ordinary unions, pay only when residual reconciliation is needed.

2•6
$0.03 per API unit
URL & QR utilities
0.0(0)

Pre-flight validation for autonomous agents: check URLs, wallet balances, gas conditions and execution assumptions before a costly action.

1•5
$0.025 per API unit
Parsing & extraction
0.0(0)

Check WordPress plugin releases for update risk before deployment.

1•3
100 FREE API units
developer-tools
0.0(0)

Color generation, conversion, contrast checking, and palette generation

1•16
100 FREE API units
Document & PDF tools
0.0(0)

Fast, accurate text extraction and line-by-line diff generation for PDF documents with precise change metrics.

1•5
50 FREE API units
Parsing & extraction
0.0(0)

Expand an iCalendar RRULE into occurrence timestamps between a start and end time. Built for calendar, scheduling, and reminder apps.

2•14
500 FREE API units
Document & PDF tools
0.0(0)

Generate print-ready Avery-compatible label PDFs from structured data or imported files.

3•14
50 FREE API units
URL & QR utilities
0.0(0)

Generate barcode images in PNG or base64. Supports Code128, EAN13, and EAN8 formats.

1•4
$10/month
URL & QR utilities
0.0(0)

Rapidly perform diverse encoding, conversion, generation, and security tasks with this high-performance, zero-dependency multi-tool API.

1•8
$25/month
Parsing & extraction
0.0(0)

Inspect public pages for forms, API and webhook signals, security headers, robots rules, latency, and automation-readiness risks.

1•9
$0.04 per API unit
Screenshot & capture
0.0(0)

Capture full-page screenshots, extract clean article text, and generate extractive summaries efficiently with the versatile Webcontent API.

2•13
100 FREE API units
Parsing & extraction
0.0(0)

Instantly parse any user agent string to precisely extract browser, OS, device type, and version, supporting all major platforms.

1•3
100 FREE API units
Code & formatting
0.0(0)

Efficiently generate RFC-compliant UUIDs, supporting versions 1 (time-based) and 4 (random), with powerful batch generation of up to 100 per request.

1•5
100 FREE API units
Code & formatting
0.0(0)

Instantly convert text to URL-friendly slugs, masterfully handling Unicode, special characters, and diverse languages for robust, consistent web links.

1•6
100 FREE API units
Code & formatting
0.0(0)

Generate up to 100 realistic fake user profiles instantly, complete with comprehensive details like name, email, and job, perfect for rapid prototyping and robu

1•3
100 FREE API units
URL & QR utilities
0.0(0)

Generate QR codes instantly from text or URL, returning high-performance PNG or Base64 for quick embedding and downloads.

1•3
100 FREE API units
Document & PDF tools
0.0(0)

Swiftly extract clean, paginated text from PDFs using direct upload or URL, powered by a fast PyMuPDF backend.

4•19
100 FREE API units
Code & formatting
0.0(0)

Automatically optimize Python data types and database schemas to reduce storage 30-75%, cutting cloud bills and speeding up applications effortlessly.

1•8
$19/month
Parsing & extraction
0.0(0)

Convert across 19 unit categories with auto-detection, compound parsing, batch, locale formatting, and cooking conversions. Stateless and fast.

2•10
100 FREE API units
Code & formatting
0.0(0)

Generate comprehensive SEO, performance, and content reports for any URL. Export structured JSON reports with actionable insights in one API call.

2•0
50 FREE API units
Code & formatting
0.0(0)

The Vector Search API enables users to discover free-to-use vector icons from a vast library of over 700,000+ icons. Each icon is accompanied by a license type.

5•1
1.5K FREE API units
Storage & key-value
0.0(0)

The Store Key-Value API is a lightweight, high-performance cloud-based storage solution that enables developers to store, retrieve, and manage key-value pairs.

7•2
100 FREE API units
Code & formatting
0.0(0)

Analyze websites in real-time for comprehensive SEO insights, delivering a score, identifying issues, and suggesting fixes for enhanced search performance.

2•6
500 FREE API units
URL & QR utilities
0.0(0)

Instantly shorten long URLs with impressive speed, enhancing user experience across platforms with ease.

1•1
$6/month
Code & formatting
0.0(0)

Get an instant SEO snapshot of any URL. Returns SEO score, title, meta tags, headings, word count, load speed & key on-page signals in one API call.

4•0
50 FREE API units
Parsing & extraction
0.0(0)

Fetch and parse XML sitemaps for any domain. Extract all URLs, detect sitemap indexes, and validate structure for SEO audits and web crawlers.

1•0
50 FREE API units
Code & formatting
0.0(0)

Audit any URL for on-page SEO issues. Extract title tags, meta descriptions, headings, internal links, image alt text & SEO health score. JSON output, free tier

1•0
50 FREE API units
Parsing & extraction
0.0(0)

Detect and extract all schema.org structured data from any webpage — JSON-LD, Microdata, RDFa. Identify Article, Product, FAQ, Review & more.

1•0
1K FREE API units
Storage & key-value
0.0(0)

The Read Key-Value API provides a fast, cloud-based storage solution that allows users to retrieve values by specifying unique keys.

5•4
1.5K FREE API units
Code & formatting
0.0(0)

The Image to ASCII Art by URL API converts remote images into text-based ASCII representations, making it ideal for command-line interfaces, creative projects.

2•1
1.5K FREE API units
Code & formatting
0.0(0)

Rapidly create detailed 3D assets for games, AR & design with Trellis—state-of-the-art AI for fast, production-ready results.

8•546
20 FREE API units
URL & QR utilities
0.0(0)

Create QR codes in various formats (SVG, PNG, base64) with lightning-fast performance and custom error correction levels.

1•4
3K FREE API units
Document & PDF tools
0.0(0)

Identity Document Verification Reference

1•10
$29/month
Code & formatting
0.0(0)

Generate classic “Lorem ipsum dolor sit amet …” in any length with a single REST call. Free tier, simple auth, instant JSON output for dev, QA and design teams.

3•0
1K FREE API units
Code & formatting
0.0(0)

Uncover website technologies with DNS, TLS, and HTTP analysis, featuring fast CPE identification for enhanced security insights.

2•4
100 FREE API units
Parsing & extraction
0.0(0)

Extract contact details from any webpage — emails, phone numbers, social links, address & contact forms. Ideal for lead gen and outreach.

3•0
50 FREE API units
Code & formatting
0.0(0)

The Convert Units API provides a simple and efficient way to convert measurements across multiple unit types, including weight, length, temperature, and more.

2•1
1.5K FREE API units
Code & formatting
0.0(0)

Save time and effort in coding: Use the Coding Assistant API for intelligent completion, highlighting, and correction tools across multiple programming language

21•1.1K
100 FREE API units
Screenshot & capture
0.0(0)

Capture lightning-fast, pixel-perfect website screenshots, automatically blocking cookie banners and popups with WebShot API, delivering raw images or cached li

1•5
100 FREE API units
Document & PDF tools
0.0(0)

Stop yak-shaving, generate a PDF now!

5•6
200 FREE API units
URL & QR utilities
0.0(0)

Generate customized, scalable QR codes: Integrate our API for efficient and reliable QR code implementation.

47•23.6K
10 FREE API units
Document & PDF tools
0.0(0)

PPT Generation using AI.

0•0
$49/month