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Test262 is the official ECMAScript (ECMA-262) conformance suite.

Test262 tests conformance to the continually maintained draft future ECMAScript standard found at , together with any Stage 3 or later TC39 proposals. It is maintained by Tom Care (@tcare) and Leo Balter (@leobalter) with significant contributions from many in the ECMAScript community.

This project is also described by the Ecma Technical Report 104.

Contributing to Test262


  1. Sign the Test262 CLA.
  2. Send a pull request. Please make sure you have one commit per pull request. If you have multiple commits, squash them before sending the pull request.

Running Test262


There are a number of volunteer-maintained projects that may be used to execute Test262 in various ECMAScript hosts: