Data Validation APIs

Data validation and verification

7 APIs in this category
Showing 7 of 7 APIs

Lob.com

Verify and standardize U.S. postal addresses in real time

Auth: apiKey HTTPS CORS: Unknown

Postman Echo

Simple API testing service to echo back HTTP requests for debugging

Auth: No HTTPS CORS: Unknown

PurgoMalum

Filter and validate content against profanity and obscenity

Auth: No HTTPS CORS: Unknown

US Autocomplete

Provide real-time address suggestions for faster data entry

Auth: apiKey HTTPS CORS: Yes

US Extract

Extract postal addresses from raw text or emails automatically

Auth: apiKey HTTPS CORS: Yes

US Street Address

Validate, correct, and append metadata for any U.S. address

Auth: apiKey HTTPS CORS: Yes

vatlayer

Validate VAT numbers and retrieve company information across the EU

Auth: apiKey HTTPS CORS: Unknown

Best Data Validation APIs for Developers

A data validation API allows developers to verify the accuracy and integrity of user-submitted data in real time: email addresses, phone numbers, postal addresses, and more. These APIs reduce form errors, improve data quality, and help prevent fraudulent submissions.

CodeHelper's curated data validation API collection includes APIs covering email verification, phone validation, address standardization, and general input sanitation.

What to look for in a data validation API

  • Validation depth: Basic syntax checks differ from deep SMTP verification; choose the level of rigor your use case requires.
  • Response speed: For real-time form validation, prioritize APIs with sub-200ms response times to avoid UI lag.
  • Bulk validation support: For cleaning existing datasets, choose APIs that support batch processing endpoints.

How to use this API directory

  1. Browse the curated list of APIs below.
  2. Click any API to visit its documentation.
  3. Check the Auth column to understand what credentials you need.

Whether you are validating sign-up forms or cleaning a CRM database, this free curated API directory saves you hours of research.

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